10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2013

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

COMMISSION FILE NUMBER: 001-32836

MEDIVATION, INC.

(Exact name of registrant as specified in its charter)

Delaware	13-3863260
(State or other jurisdiction of incorporation or organization)	(IRS Employer identification No.)

525 Market Street, 36th floor

San Francisco, California 94105

(Address of principal executive offices) (Zip Code)

(415) 543-3470

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

As of August 2, 2013, 75,212,035 shares of the registrant’s Common Stock, $0.01 par value per share, were issued and outstanding.

PART I — FINANCIAL INFORMATION
ITEM 1.	FINANCIAL STATEMENTS.	3
	CONSOLIDATED BALANCE SHEETS.	3
	CONSOLIDATED STATEMENTS OF OPERATIONS.	4
	CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS.	5
	CONSOLIDATED STATEMENTS OF CASH FLOWS.	6
	NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.	7
ITEM 2.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.	23
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.	32
ITEM 4.	CONTROLS AND PROCEDURES.	33
PART II — OTHER INFORMATION
ITEM 1.	LEGAL PROCEEDINGS.	33
ITEM 1A.	RISK FACTORS.	34
ITEM 6.	EXHIBITS.	54

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

MEDIVATION, INC.

CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share data)

(unaudited)

	June 30, 2013			December 31, 2012
ASSETS
Current assets:
Cash and cash equivalents	$	100,987		$	71,301
Short-term investments		144,956			224,939
Receivable from collaboration partner		64,319			35,458
Restricted cash		343			343
Prepaid expenses and other current assets		14,711			12,175
Total current assets		325,316			344,216
Property and equipment, net		16,324			13,262
Restricted cash, net of current		9,899			8,843
Other non-current assets		6,369			5,545
Total assets	$	357,908		$	371,866
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	3,944		$	2,073
Accrued expenses and other current liabilities		57,485			48,951
Deferred revenue		25,396			33,862
Total current liabilities		86,825			84,886
Convertible Notes, net of unamortized discount of $56,774 and $62,743 at June 30, 2013 and December 31, 2012, respectively		201,976			196,007
Deferred revenue, net of current		—			8,465
Other non-current liabilities		7,475			8,863
Total liabilities		296,276			298,221
Commitments and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, $0.01 par value per share; 1,000,000 shares authorized; no shares issued and outstanding		—			—
Common stock, $0.01 par value per share; 170,000,000 shares authorized; 75,095,615 and 74,774,939 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively		751			748
Additional paid-in capital		384,485			364,412
Accumulated other comprehensive income		12			33
Accumulated deficit		(323,616	)		(291,548	)
Total stockholders’ equity		61,632			73,645
Total liabilities and stockholders’ equity	$	357,908		$	371,866

The accompanying notes are an integral part of these unaudited consolidated financial statements.

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MEDIVATION, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)

(unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Collaboration revenue	$	70,149		$	42,912		$	116,303		$	79,737
Operating expenses:
Research and development expenses		28,205			21,550			53,113			41,580
Selling, general and administrative expenses		41,890			22,337			85,458			38,024
Total operating expenses		70,095			43,887			138,571			79,604
Income (loss) from operations		54			(975	)		(22,268	)		133
Other income (expense), net:
Interest expense		(4,982	)		(4,688	)		(9,870	)		(5,273	)
Interest income		52			56			126			83
Other income (expense), net		10			83			9			(15	)
Total other income (expense), net		(4,920	)		(4,549	)		(9,735	)		(5,205	)
Net loss before income tax (expense) benefit		(4,866	)		(5,524	)		(32,003	)		(5,072	)
Income tax (expense) benefit		(32	)		24			(65	)		12
Net loss	$	(4,898	)	$	(5,500	)	$	(32,068	)	$	(5,060	)
Basic and diluted net loss per common share	$	(0.07	)	$	(0.08	)	$	(0.43	)	$	(0.07	)
Weighted average common shares used in the calculation of basic and diluted net loss per common share		75,013			72,770			74,919			72,339

The accompanying notes are an integral part of these unaudited consolidated financial statements.

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MEDIVATION, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS

(in thousands)

(unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Net loss	$	(4,898	)	$	(5,500	)	$	(32,068	)	$	(5,060	)
Other comprehensive loss:
Change in unrealized (loss) gain on available-for-sale securities, net		(4	)		10			(21	)		(10	)
Other comprehensive (loss) income, net		(4	)		10			(21	)		(10	)
Comprehensive loss	$	(4,902	)	$	(5,490	)	$	(32,089	)	$	(5,070	)

The accompanying notes are an integral part of these unaudited consolidated financial statements.

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MEDIVATION, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

(unaudited)

	Six Months Ended June 30,
	2013			2012
Cash flows from operating activities:
Net loss	$	(32,068	)	$	(5,060	)
Adjustments for non-cash operating items:
Amortization of deferred revenue		(16,931	)		(79,737	)
Stock-based compensation		16,427			9,917
Amortization of debt discount and debt issuance costs		6,474			3,349
Depreciation on property and equipment		1,554			250
Accretion of discount on securities		(112	)		(48	)
Loss on disposal of equipment		35			—
Changes in operating assets and liabilities:
Receivable from collaboration partners		(28,861	)		(1,956	)
Prepaid expenses and other current assets		(3,733	)		(1,982	)
Other non-current assets		(1,383	)		111
Accounts payable		1,871			314
Accrued expenses and other current liabilities		8,534			15,295
Interest payable		—			1,924
Other non-current liabilities		(137	)		1,862
Net cash used in operating activities		(48,330	)		(55,761	)
Cash flows from investing activities:
Purchases of short-term investments		(144,926	)		(199,914	)
Maturities of short-term investments		225,000			75,000
Purchases of property and equipment		(4,651	)		(5,825	)
Change in restricted cash		(1,056	)		(816	)
Net cash provided by (used in) investing activities		74,367			(131,555	)
Cash flows from financing activities:
Proceeds from issuance of Convertible Notes, net		—			250,987
Financing transaction costs		—			(614	)
Proceeds from issuance of common stock under Medivation Equity Incentive Plan		3,649			11,326
Net cash provided by financing activities		3,649			261,699
Net increase in cash and cash equivalents		29,686			74,383
Cash and cash equivalents at beginning of period		71,301			70,136
Cash and cash equivalents at end of period	$	100,987		$	144,519
Supplemental disclosures of cash flow information:
Non-cash investing activities:
Property and equipment expenditures incurred but not yet paid	$	—		$	6,220

The accompanying notes are an integral part of these unaudited consolidated financial statements.

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MEDIVATION, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2013

(unaudited)

NOTE 1 — DESCRIPTION OF BUSINESS

Medivation, Inc. (the “Company” or “Medivation”) is a biopharmaceutical company focused on the rapid development and commercialization of novel therapies to treat serious diseases for which there are limited treatment options. The Company selects technologies for development that meet three primary criteria, namely, the technology has: (a) in the judgment of the Company’s scientific leadership, an above-average likelihood of working; (b) strong intellectual property and/or data exclusivity protection; and (c) the ability to target one or more serious diseases for which existing technologies are suboptimal. When selecting technologies for development, the Company focuses primarily on those that it believes have the ability to enter human studies within 12-18 months. The Company considers technologies without regard to therapeutic indication or therapeutic modality (i.e., small molecules, biologics, medical devices, etc). The Company may develop technologies through its own internal research activities, or in-license technologies from academic institutions or other third parties. Once the Company selects a technology for development, it seeks to advance it quickly, strategically and cost-effectively to commercialization. The Company’s commercialization strategy for any of its product candidates that receive marketing approval will vary depending on the target customer base for that product candidate, the Company’s then current commercial capabilities, the extent to which the Company deems it prudent and cost-effective to build additional internal capabilities, and the availability, quality and cost of third-party commercialization partners.

The Company’s most advanced program is XTANDI^® (enzalutamide) capsules, or XTANDI, which is partnered with Astellas Pharma Inc., or Astellas. The Company in-licensed the intellectual property rights covering XTANDI in 2005, began its first clinical trial in 2007, entered into a collaboration agreement with Astellas in 2009, reported positive Phase 3 overall survival data in 2011 in patients with metastatic castration-resistant prostate cancer who have previously received docetaxel, or post-chemotherapy mCRPC patients, and on August 31, 2012, received regulatory approval from the U.S. Food and Drug Administration, or FDA, for the treatment of post-chemotherapy mCRPC patients. The Company and Astellas began co-promoting XTANDI for that indication in the United States on September 13, 2012. On June 24, 2013, the Company announced that XTANDI was granted marketing authorization in the European Union, or EU, for the treatment of adult men with mCRPC whose disease has progressed on or after docetaxel therapy. XTANDI is approved in Canada and South Korea for the post-docetaxel indication and marketing applications for XTANDI are under review in Argentina, Australia, Brazil, Japan, South Africa and Switzerland. Together with Astellas, the Company is also conducting multiple trials of enzalutamide in earlier prostate cancer disease states, including the Phase 3 PREVAIL trial in patients with mCRPC who have not received chemotherapy, or pre-chemotherapy mCRPC, and in patients with metastatic breast cancer. The Company also has ongoing programs with other agents in multiple different indications in early stages of research and development. These early-stage programs are unpartnered.

In January 2012, the Company’s former collaboration partner Pfizer, Inc., or Pfizer, exercised its right to terminate the Company’s collaboration agreement for the development and commercialization of the Company’s former product candidate dimebon for the treatment of Alzheimer’s disease and Huntington disease, due to negative Phase 3 trial results in both indications. The Company and Pfizer discontinued development of dimebon for all indications in January 2012, and completed the wind-down of each of its respective remaining collaboration activities in the third quarter of 2012.

The Company has funded its operations primarily through public offerings of its common stock, the issuance of 2.625% convertible senior notes due April 1, 2017, or the Convertible Notes, from up-front, development milestone and cost-sharing payments under its collaboration agreement with Astellas, or the Astellas Collaboration Agreement, and its former collaboration agreement with Pfizer and, subsequent to September 13, 2012, from collaboration revenue attributable to XTANDI sales. The Company has incurred cumulative net losses of $323.6 million through June 30, 2013, and expects to incur substantial additional losses for the foreseeable future as it continues to finance the commercialization of XTANDI in the U.S. market, clinical and preclinical studies of enzalutamide and the Company’s early-stage technologies, and its corporate overhead costs. The Company does not know when, or if, it will become profitable, or whether XTANDI will be approved for sale in the United States, EU, Canada, or South Korea for any indication other than treatment of post-chemotherapy mCRPC patients, or will be approved for sale in any other market for any indication.

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NOTE 2 — SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

(a) Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States, or U.S. GAAP, for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The unaudited consolidated financial statements have been prepared on the same basis as the annual audited consolidated financial statements. In the opinion of management, all adjustments, consisting of normal recurring adjustments necessary for the fair statement of the Company’s financial condition, results of operations and cash flows for the periods presented, have been included. The results of operations of any interim period are not necessarily indicative of the results of operations for the full year or any other interim period.

The unaudited consolidated financial statements and related disclosures have been prepared with the presumption that users of the interim unaudited consolidated financial statements have read or have access to the audited consolidated financial statements for the preceding fiscal year. Accordingly, these unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the fiscal year ended December 31, 2012 included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012, or the Annual Report, filed with the U.S. Securities and Exchange Commission, or SEC, on February 28, 2013. The consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.

The unaudited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The Company operates in one operating segment.

All tabular disclosures of dollar and share amounts are presented in thousands, unless indicated otherwise. All per share amounts are presented at their actual amounts. The number of shares issuable under the Amended and Restated 2004 Equity Incentive Award Plan, or the Medivation Equity Incentive Plan, disclosed in Note 8, “Stockholder’s Equity,” are presented at their actual amounts. Amounts presented herein may not calculate or sum precisely due to rounding.

(b) Use of Estimates

The preparation of unaudited consolidated financial statements in accordance with U.S. GAAP requires that management make estimates and assumptions in certain circumstances that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Although management believes that these estimates are reasonable, actual future results could differ from those estimates. In addition, had different estimates and assumptions been used, the unaudited consolidated financial statements could have differed materially from what is presented.

Estimates and assumptions used by management principally relate to: revenue recognition, including estimates of the various deductions from gross sales used to calculate net sales of XTANDI, reliance on third-party information, and the estimated performance periods of the Company’s deliverables under the Astellas Collaboration Agreement and its former collaboration agreement with Pfizer; services performed by third parties but not yet invoiced; the fair value and forfeiture rates of equity awards under the Medivation Equity Incentive Plan and the probability of attaining the performance objectives of performance share awards; the probability and potential magnitude of contingent liabilities; Convertible Notes, including the Company’s estimate of how the net proceeds thereof should be bifurcated between the debt component and the equity component; and deferred income taxes, income tax provisions and accruals for uncertain income tax positions.

(c) Capital Structure

On September 20, 2012, the Company filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation, as amended, effecting an increase in the total number of authorized shares of capital stock of the Company from 51,000,000 to 86,000,000 and an increase in the total number of authorized shares of common stock of the Company from 50,000,000 to 85,000,000.

On September 21, 2012, the Company filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation, as amended, effecting (i) an increase in the total number of authorized shares of capital stock of the Company from 86,000,000 to 171,000,000, (ii) an increase in the total number of authorized shares of common stock of the Company from 85,000,000 to 170,000,000, and (iii) a two-for-one forward split of its common stock effective as of 5:00 p.m., Eastern Time, on September 21, 2012.

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The Company issued approximately 37.0 million shares of its common stock as a result of the two-for-one forward stock split. The par value of the Company’s common stock remained unchanged at $0.01 per share.

Information regarding shares of common stock (except par value per share), additional paid-in-capital, and net loss per common share for all periods presented reflects the two-for-one forward split of the Company’s common stock. The number of shares of the Company’s common stock issuable upon exercise of outstanding stock options and vesting of other stock-based awards was proportionally increased, and the exercise price per share thereof was proportionally decreased, in accordance with the terms of the Medivation Equity Incentive Plan. Following the completion of the two-for-one forward stock split, the conversion rate of the Company’s Convertible Notes was adjusted to 19.5172 shares of common stock per $1,000 principal amount of the Convertible Notes, equivalent to a conversion price of approximately $51.24 per share of common stock.

(d) Significant Accounting Policies

Reference is made to Note 2, “Summary of Significant Accounting Policies,” included in the notes to the Company’s audited consolidated financial statements included in its Annual Report. As of the date of the filing of this Quarterly Report on Form 10-Q, or the Quarterly Report, there were no significant changes to the significant accounting policies described in the Company’s Annual Report.

(e) Recently Issued Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2013-02, “Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income.” This amended guidance requires companies to provide enhanced footnote disclosures to explain the effect of reclassification adjustments out of other comprehensive income, or OCI, by component and provide tabular disclosure in the footnotes showing the effect of items reclassified from accumulated OCI on the line items of net income (loss). The Company adopted this amended guidance prospectively as of January 1, 2013. The adoption of this amended guidance did not have an impact on the Company’s consolidated financial position, results of operations or cash flows.

In July 2013, the FASB issued ASU No. 2013-11, “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists.” This update clarifies that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss, or NOL, carryforward, a similar tax loss, or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. In situations where an NOL carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction or the tax law of the jurisdiction does not require, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. This ASU is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. Retrospective application is permitted. The Company does not believe the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

(f) Out-of-Period Adjustment

In the first quarter of 2013, the Company recorded an out-of-period correcting adjustment that increased operating expenses and net loss by $3.6 million for the three months ended March 31, 2013. Management concluded that the adjustment is not material to the expected full year 2013 results or any previously reported financial statements.

NOTE 3 — COLLABORATION AGREEMENTS

(a) Collaboration Agreement with Astellas

In October 2009, the Company entered into the Astellas Collaboration Agreement pursuant to which it is collaborating with Astellas to develop and commercialize XTANDI globally. Under the agreement, decision making and economic participation differs between the U.S. market and the ex-U.S. market. In the United States, decisions are generally made by consensus, pre-tax profits and losses are shared equally, and, subject to certain exceptions, development and commercialization costs (including cost of goods sold and the royalty on net sales payable to The Regents of the University of California, or UCLA, under the Company’s license agreement with UCLA) are also shared equally. The primary exceptions to equal cost sharing in the U.S. market are that each party bears its own commercial full-time equivalent, or FTE, costs, and that development costs supporting regulatory approvals in both the United States and either Europe or Japan are borne one-third by the Company and two-thirds by Astellas. The Company and Astellas are co-promoting XTANDI in the U.S. market, with each company providing half of the sales and medical affairs effort in support of the product. Both the Company and Astellas are entitled to receive a fee for each qualifying detail made by its respective sales representatives. Outside the United States,

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decisions are generally made by Astellas and all development and commercialization costs (including cost of goods sold and the royalty on net sales payable to UCLA) are borne by Astellas. Astellas retains all ex-U.S. profits and losses, and pays the Company a tiered royalty ranging from the low teens to the low twenties on any aggregate net sales of XTANDI outside the United States, or ex-U.S. XTANDI sales. Astellas has sole responsibility for promoting XTANDI outside the United States, and for recording all XTANDI sales both inside and outside the United States. Both the Company and Astellas have agreed not to commercialize certain other products having a similar mechanism of action as XTANDI for the treatment of specified indications for a specified time period, subject to certain exceptions.

Under the Astellas Collaboration Agreement, Astellas paid the Company a non-refundable, up-front cash payment of $110.0 million in the fourth quarter of 2009. The Company is also eligible to receive up to $335.0 million in development milestone payments, plus up to an additional $320.0 million in sales milestone payments. As of June 30, 2013, the Company had received an aggregate of $63.0 million in development milestone payments under the Astellas Collaboration Agreement. In addition, at June 30, 2013, a $15.0 million development milestone payment was included in “receivable from collaboration partner” on the accompanying unaudited consolidated balance sheet. This development milestone payment was received during the third quarter of 2013. The Company expects that any of the remaining $257.0 million in development milestone payments and the $320.0 million in sales milestone payments that the Company may earn in future periods will be recognized as revenue in their entirety in the period in which the underlying milestone event is achieved.

The remaining $257.0 million in development milestone payments the Company is eligible to receive under the Astellas Collaboration Agreement are as follows:

Milestone Event	4th line prostate  cancer patients (1)			3rd line prostate  cancer patients (2)		2nd line prostate  cancer patients (3) (4)
First acceptance for filing of a marketing application in:
The U.S.			(5)	$	10 million	$	15 million
The first major country in Europe			(5)	$	5 million	$	10 million
Japan			(5)	$	5 million	$	10 million
First approval of a marketing application in:
The U.S.			(5)	$	30 million	$	60 million
The first major country in Europe			(5)	$	15 million	$	30 million
Japan	$	15 million		$	15 million	$	30 million

⁽¹⁾  Defined as prostate cancer patients who meet each of the following three criteria: (a) prior treatment failure on either (i) one or more luteinizing hormone-releasing hormone, or LHRH, analog drugs or (ii) surgical castration; (b) prior treatment failure on one or more androgen receptor antagonist drugs; and (c) prior treatment failure on chemotherapy.

⁽²⁾  Defined as prostate cancer patients who meet each of the following three criteria: (a) prior treatment failure on either (i) one or more LHRH analog drugs or (ii) surgical castration; (b) prior treatment failure on one or more androgen receptor antagonist drugs; and (c) no prior exposure to chemotherapy for prostate cancer.

⁽³⁾  Defined as prostate cancer patients who meet each of the following two criteria: (a) prior treatment failure on either (i) one or more LHRH analog drugs or (ii) surgical castration; and (b) no prior treatment failure on one or more androgen receptor antagonist drugs.

⁽⁴⁾  An additional milestone payment of $7.0 million is payable upon the first to occur of: (a) first approval of a marketing application in the United States with a label encompassing 2nd line prostate cancer patients; (b) first approval of a marketing application in the first major country in Europe with a label encompassing 2nd line prostate cancer patients; (c) first approval of a marketing application in Japan with a label encompassing 2nd line prostate cancer patients; or (d) first patient dosed in a Phase 3 clinical trial other than the PREVAIL trial that is designed specifically to support receipt of marketing approval in 2nd line patients.

⁽⁵⁾  These milestone payments totaling $78.0 million have been previously earned and payments totaling $63.0 million had been received as of June 30, 2013. A $15.0 million milestone payment, which was included in “receivable from collaboration partner” on the accompanying unaudited consolidated balance sheet at June 30, 2013, was received during the third quarter of 2013.

Under the Company’s license agreement with UCLA, and subsequent amendments to this agreement, the Company is required to share with UCLA ten percent of the development milestone payments that the Company earns under the Astellas Collaboration Agreement. In ongoing litigation with UCLA initiated by the Company, UCLA has alleged in a cross-complaint that the Company is also required to share with UCLA ten percent of any sales milestone payments the Company may receive under the Astellas Collaboration Agreement. The Company disputes this allegation, and intends to defend its position vigorously. For more information about this litigation, see Note 11, “Commitments and Contingencies.”

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The Company and Astellas are each permitted to terminate the Astellas Collaboration Agreement for an uncured material breach by the other party or for the insolvency of the other party. Astellas has a right to terminate the Astellas Collaboration Agreement unilaterally by advance written notice to the Company, but, except in certain specified circumstances, generally cannot exercise that termination right until the first anniversary of XTANDI’s first commercial sale. Following any termination of the Astellas Collaboration Agreement in its entirety, all rights to develop and commercialize XTANDI will revert to the Company, and Astellas will grant a license to the Company to enable it to continue such development and commercialization. In addition, except in the case of a termination by Astellas for the Company’s material breach, Astellas will supply XTANDI to the Company during a specified transition period.

Unless terminated earlier by the Company or Astellas pursuant to the terms thereof, the Astellas Collaboration Agreement will remain in effect: (a) in the United States, until such time as Astellas notifies the Company that Astellas has permanently stopped selling products covered by the Astellas Collaboration Agreement in the United States; and (b) in each other country of the world, on a country-by-country basis, until such time as (i) products covered by the Astellas Collaboration Agreement cease to be protected by patents or regulatory exclusivity in such country and (ii) commercial sales of generic equivalent products have commenced in such country.

(b) Former Collaboration Agreement with Pfizer

The Company entered into a collaboration agreement with Pfizer in October 2008. Under the terms of the agreement, the Company and Pfizer agreed to collaborate on the development and commercialization of its former product candidate dimebon for the treatment of Alzheimer’s disease and Huntington disease for the U.S. market. Pfizer paid the Company a non-refundable, up-front cash payment of $225.0 million in the fourth quarter of 2008. Under the terms of the former collaboration agreement with Pfizer, the Company and Pfizer shared the costs and expenses of developing and commercializing dimebon for the U.S. market on a 60%/40% basis, with Pfizer assuming the larger share. In January 2012, Pfizer exercised its right to terminate the collaboration agreement and the Company and Pfizer discontinued development of dimebon for all indications due to the negative Phase 3 trial results in both indications.

(c) Collaboration Revenue

Collaboration revenue consists of three components: (a) collaboration revenue attributable to U.S. XTANDI sales; (b) collaboration revenue attributable to ex-U.S. XTANDI sales; and (c) collaboration revenue attributable to up-front and milestone payments.

Collaboration revenue was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Collaboration revenue:
Attributable to U.S. XTANDI sales	$	41,201	$	—	$	78,890	$	—
Attributable to ex-U.S. XTANDI sales		482		—		482		—
Attributable to up-front and milestone payments		28,466		42,912		36,931		79,737
Total	$	70,149	$	42,912	$	116,303	$	79,737

Collaboration Revenue Attributable to U.S. XTANDI Sales

Under the Astellas Collaboration Agreement, Astellas records all U.S. XTANDI sales. The Company and Astellas share equally all pre-tax profits and losses from U.S. XTANDI sales. Subject to certain exceptions, the Company and Astellas also share equally all XTANDI development and commercialization costs attributable to the U.S. market, including cost of goods sold and the royalty on net sales payable to UCLA under the Company’s license agreement with UCLA. The primary exceptions to 50/50 cost sharing are that each party bears its own commercial FTE costs and that development costs supporting regulatory approvals in both the United States and either Europe or Japan are borne one-third by the Company and two-thirds by Astellas. The Company recognizes collaboration revenue attributable to U.S. XTANDI sales in the period in which such sales occur. Collaboration revenue attributable to U.S. XTANDI sales consists of the Company’s share of pre-tax profits and losses from U.S. sales, plus reimbursement of the Company’s share of reimbursable U.S. development and commercialization costs. The Company’s collaboration revenue attributable to U.S. XTANDI sales in any given period will be mathematically equal to 50% of U.S. XTANDI net sales as reported by Astellas for the applicable period.

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Collaboration revenue attributable to U.S. XTANDI sales was as follows:

	Three Months Ended June 30, 2013			Six Months Ended June 30, 2013
Net U.S. sales (as reported by Astellas)	$	82,402		$	157,780
Shared U.S. development and commercialization costs		(61,431	)		(119,101	)
Pre-tax U.S. profit	$	20,971		$	38,679
Medivation’s share of pre-tax U.S. profit	$	10,486		$	19,340
Reimbursement of Medivation’s share of shared U.S. costs		30,715			59,550
Collaboration revenue attributable to U.S. XTANDI sales	$	41,201		$	78,890

XTANDI first became available for shipment on September 13, 2012. There was no collaboration revenue attributable to U.S. XTANDI sales for the three and six months ended June 30, 2012.

Collaboration Revenue Attributable to Ex-U.S. XTANDI Sales

Under the Astellas Collaboration Agreement, Astellas records all ex-U.S. XTANDI sales. Astellas is responsible for all development and commercialization costs for XTANDI outside the United States, including cost of goods sold and the royalty on net sales payable to UCLA under the Company’s license agreement with UCLA, and pays the Company a tiered royalty ranging from the low teens to the low twenties on net ex-U.S. XTANDI sales. The Company recognizes collaboration revenue attributable to ex-U.S. XTANDI sales in the period in which such sales occur. Collaboration revenue attributable to ex-U.S. XTANDI sales consists of royalty payments from Astellas on those sales.

Collaboration revenue attributable to ex-U.S. XTANDI sales was $0.5 million for the three and six months ended June 30, 2013. There was no collaboration revenue attributable to ex-U.S. XTANDI sales for the three and six months ended June 30, 2012.

Collaboration Revenue Attributable to Up-front and Milestone Payments

The Company records non-refundable, up-front payments under its current and former collaboration agreements as deferred revenue and recognizes these payments as collaboration revenue on a straight-line basis over the applicable estimated performance period. The Company’s performance period under the Astellas Collaboration Agreement began in the fourth quarter of 2009 and at June 30, 2013, management estimated that it would be completed in the first quarter of 2014. The Company’s performance period under its former collaboration agreement with Pfizer concluded in the third quarter of 2012 upon completion of the Company’s performance obligations.

The Company is eligible to receive milestone payments under the Astellas Collaboration Agreement based on the achievement of specified development, regulatory and commercial events. Management evaluated the nature of the events triggering these contingent payments, and concluded that these events fall into two categories: (a) events which involve the performance of the Company’s obligations under the Astellas Collaboration Agreement, and (b) events which do not involve the performance of the Company’s obligations under the Astellas Collaboration Agreement.

The former category of milestone payments consists of those triggered by development and regulatory activities in the United States and by the acceptance for review of marketing applications in Europe and Japan. Management concluded that each of these payments, with one exception, constitute substantive milestones. This conclusion was based primarily on the facts that (i) each triggering event represents a specific outcome that can be achieved only through successful performance by the Company of one or more of its deliverables, (ii) achievement of each triggering event was subject to inherent risk and uncertainty and would result in additional payments becoming due to the Company, (iii) each of the milestone payments is non-refundable, (iv) substantial effort is required to complete each milestone, (v) the amount of each milestone payment is reasonable in relation to the value created in achieving the milestone, (vi) a substantial amount of time is expected to pass between the up-front payment and the potential milestone payments, and (vii) the milestone payments relate solely to past performance. Based on the foregoing, the Company recognizes any revenue from these milestone payments in the period in which the underlying triggering event occurs. The one exception is the milestone payment for initiation of the Phase 3 PREVAIL trial, an event which management deemed to be reasonably assured at the inception of the Astellas collaboration. This milestone payment was triggered in the third quarter of 2010, and the Company is recognizing the milestone payment as revenue on a straight-line basis over the estimated performance period of the Astellas Collaboration Agreement.

The latter category of milestone payments consists of those triggered by potential regulatory approvals in Europe and Japan, and commercial activities globally, all of which are areas in which the Company has no pertinent contractual responsibilities under the Astellas Collaboration Agreement. Management concluded that these payments constitute contingent revenues and thus recognizes them as revenue in the period in which the contingency is met.

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Through June 30, 2013, the Company has received an aggregate of $173.0 million of payments from Astellas, consisting of an up-front payment of $110.0 million and development milestone payments of $63.0 million, and a $225.0 million up-front payment under its former collaboration agreement with Pfizer. In addition, at June 30, 2013, a development milestone of $15.0 million was earned under the Astellas Collaboration Agreement and is included in collaboration revenue for the three and six months ended June 30, 2013. This amount is included in “receivable from collaboration partner” on the accompanying unaudited consolidated balance sheet at June 30, 2013 and was received during the third quarter of 2013.

Collaboration revenue attributable to up-front and milestone payments was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Collaboration revenue attributable to up-front and milestone payments:
From Astellas	$	28,466	$	7,256	$	36,931	$	13,193
From Pfizer		—		35,656		—		66,544
Total	$	28,466	$	42,912	$	36,931	$	79,737

Deferred revenue under the Astellas Collaboration Agreement consisted of the following:

	June 30, 2013		December 31, 2012
Current	$	25,396	$	33,862
Long-term		—		8,465
Total	$	25,396	$	42,327

(d) Cost-Sharing Payments

Under both the Astellas Collaboration Agreement and the former collaboration agreement with Pfizer, the Company and its collaboration partners share certain development and commercialization costs (including in the case of the Astellas Collaboration Agreement, cost of goods sold and the royalty on net sales payable to UCLA under the Company’s license agreement with UCLA) in the United States. The parties make quarterly cost-sharing payments to one another in amounts necessary to ensure that each party bears its contractual share of the overall shared U.S. development and commercialization costs incurred. The Company’s policy is to account for cost-sharing payments to its collaboration partners as increases in expense in its consolidated statements of operations, while cost-sharing payments by its collaboration partners to the Company are accounted for as reductions in expense. Cost-sharing payments related to development activities and commercialization activities are recorded in research and development, or R&D, expenses, and selling, general and administrative, or SG&A, expenses, respectively.

The following table summarizes the reductions in R&D expenses related to development cost-sharing payments:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Development cost-sharing payments from Astellas	$	11,309	$	14,013	$	18,547	$	28,128
Development cost-sharing payments from Pfizer		—		362		—		1,689
Total	$	11,309	$	14,375	$	18,547	$	29,817

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The following table summarizes the (increases) reductions in SG&A expenses related to commercialization cost-sharing payments:

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Commercialization cost-sharing payments (to) from Astellas	$	(3,791	)	$	146	$	(8,576	)	$	(670	)
Commercialization cost-sharing payments from Pfizer		—			5		—			9
Total	$	(3,791	)	$	151	$	(8,576	)	$	(661	)

NOTE 4 — NET INCOME (LOSS) PER COMMON SHARE

The computation of basic net income (loss) per common share is based on the weighted-average number of common shares outstanding during each period. The computation of diluted net income (loss) per common share is based on the weighted-average number of common shares outstanding during the period plus, when their effect is dilutive, incremental shares consisting of shares subject to stock options, restricted stock units, performance share awards, stock appreciation rights, warrants and shares issuable upon conversion of convertible debt.

In periods where the Company reported a net loss, all common stock equivalents and convertible securities are deemed anti-dilutive such that basic net loss per common share and diluted net loss per common share are equal.

In periods in which the Company has net income, it uses the “if-converted” method in calculating the diluted net income per common share effect of the assumed conversion of the Convertible Notes because they can be settled in stock, cash or a combination thereof. Under the “if -converted” method, interest expense related to the Convertible Notes is added back to net income, and the Convertible Notes are assumed to have been converted into common shares at the beginning of the period (or the issuance date) in periods in which there would be a dilutive effect.

Potentially dilutive common shares have been excluded from the diluted net loss per common share computations for the three and six months ended June 30, 2013 and 2012 because such securities have an anti-dilutive effect on net loss per common share due to the Company’s net loss during these periods. Outstanding securities, and the number of potentially dilutive common shares underlying such securities, were as follows:

	June 30,
	2013		2012
Stock options		7,049		7,348
Convertible Notes		5,050		5,050
Restricted stock units		446		250
Stock appreciation rights		442		—
Performance shares		—		84
Warrants		46		46
Total		13,033		12,778

NOTE 5 — CONVERTIBLE SENIOR NOTES DUE 2017

On March 19, 2012, the Company completed the sale of $258.8 million aggregate principal amount of Convertible Notes. The Convertible Notes are governed by an indenture, dated as of March 19, 2012 between the Company and Wells Fargo Bank, National Association as Trustee, as supplemented by the first supplemental indenture dated as of March 19, 2012, or the Indenture. The Convertible Notes bear interest at a rate of 2.625% per annum, payable semi-annually in arrears on April 1 and October 1 of each year, beginning on October 1, 2012. The Convertible Notes mature on April 1, 2017, unless earlier converted, redeemed or repurchased in accordance with their terms. The Convertible Notes are general senior unsecured obligations and rank (1) senior in right of payment to any of the Company’s future indebtedness that is expressly subordinated in right of payment to the Convertible Notes, (2) equal in right of payment to any of the Company’s future indebtedness and other liabilities of the Company that are not so subordinated, (3) junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness and (4) structurally junior to all future indebtedness incurred by the Company’s subsidiaries and their other liabilities (including trade payables).

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Prior to April 6, 2015, the Convertible Notes are not redeemable. On or after April 6, 2015, the Company may redeem for cash all or a part of the Convertible Notes if the closing sale price of its common stock for 20 or more trading days in a period of 30 consecutive trading days ending on the trading day preceding the date it provides notice of the redemption exceeds 130% of the conversion price in effect on each such trading day, subject to certain conditions. The redemption price will equal 100% of the principal amount of the Convertible Notes to be redeemed plus accrued and unpaid interest, if any, to, but excluding the redemption date. If a fundamental change (as defined in the Indenture) occurs prior to the maturity date, holders may require the Company to purchase for cash all or any portion of the Convertible Notes at a purchase price equal to 100% of the principal amount of the Convertible Notes to be purchased plus accrued and unpaid interest, if any, to, but excluding, the fundamental change purchase date.

Holders may convert their Convertible Notes prior to the close of business on the business day immediately preceding January 1, 2017 only upon the occurrence of the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on June 30, 2012, if the closing sale price of the Company’s common stock, for at least 20 trading days (whether or not consecutive) in the period of 30 consecutive trading days ending on the last trading day of the calendar quarter immediately preceding the calendar quarter in which the conversion occurs, is more than 130% of the conversion price of the Convertible Notes in effect on each applicable trading day; (2) during the five consecutive trading-day period following any five consecutive trading-day period in which the trading price for the Convertible Notes for each such trading day was less than 98% of the closing sale price of the Company’s common stock on such date multiplied by the then-current conversion rate; (3) upon the occurrence of specified corporate events; or (4) if the Company calls any Convertible Notes for redemption, at any time until the close of business on the second business day preceding the redemption date. On or after January 1, 2017 until the close of business on the second business day immediately preceding the stated maturity date, holders may surrender their Convertible Notes for conversion at any time, regardless of the foregoing circumstances. At June 30, 2013, the Convertible Notes were not convertible.

Upon conversion of the Convertible Notes, the Company will pay or deliver, as the case may be, cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s election. The initial conversion rate was 9.7586 shares of common stock per $1,000 principal amount of the Convertible Notes, equivalent to a conversion price of approximately $102.47 per share of common stock. On September 21, 2012, following the completion of a two-for-one forward split of the Company’s common stock, the conversion rate was adjusted to 19.5172 shares of common stock per $1,000 principal amount of the Convertible Notes, equivalent to a conversion price of approximately $51.24 per share of common stock. The conversion rate is subject to adjustment in certain events, such as distribution of dividends and stock splits. In addition, upon a Make-Whole Adjustment Event (as defined in the Indenture), the Company will, under certain circumstances, increase the applicable conversion rate for a holder that elects to convert its Convertible Notes in connection with such Make-Whole Adjustment Event.

The debt and equity components of the Convertible Notes have been bifurcated and accounted for separately based on the authoritative accounting guidance in Accounting Standards Codification, or ASC, 470-20, “Debt with Conversion and Other Options.” The $258.8 million aggregate principal amount of Convertible Notes was bifurcated between the debt component ($187.1 million) and the equity component ($71.7 million). The amount allocated to the debt component of $187.1 million was estimated based on the fair value of similar debt instruments that do not include an equity conversion feature. The Convertible Notes were recorded at an initial carrying value of $187.1 million, net of $71.7 million in debt discount. The debt discount will be accreted to the carrying value of the Convertible Notes as non-cash interest expense utilizing the effective yield amortization method over the period ending on April 1, 2017, which is the scheduled maturity date of the Convertible Notes. Debt discount amortized during the three and six months ended June 30, 2013 was $3.0 million and $6.0 million, respectively. Debt discount amortized during the three and six months ended June 30, 2012 was $2.7 million and $3.1 million, respectively. At June 30, 2013, the carrying value of the Convertible Notes was $202.0 million, net of $56.8 million of unamortized debt discount.

The Company incurred issuance costs of $8.4 million, consisting primarily of investment banking, legal and other professional fees. These issuance costs were allocated to the debt component ($6.1 million) and the equity component ($2.3 million) in proportion to the allocation of the Convertible Note proceeds. The $6.1 million of issuance costs allocated to the debt component was capitalized and is being amortized as non-cash interest expense utilizing the effective yield amortization method over the period ending on the scheduled maturity date of the Convertible Notes. The $2.3 million of issuance costs allocated to the equity component was charged to additional paid-in capital.

After giving effect to the bifurcation described above, the effective interest rate on the Convertible Notes was 10.71% for the three and six months ended June 30, 2013 and 2012. The Company recognized total interest expense of $5.0 million and $9.9 million for the three and six months ended June 30, 2013, respectively, consisting of $1.7 million and $3.4 million of interest expense, respectively, based on the 2.625% coupon rate of the Convertible Notes and $3.3 million and $6.5 million of non-cash interest expense, respectively, related to the amortization of the debt discount and debt issuance costs. The Company recognized total interest expense of $4.7 million and $5.3 million for the three and six months ended June 30, 2012,

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respectively, consisting of $1.7 and $1.9 million of interest expense, respectively, based on the 2.625% coupon rate of the Convertible Notes and $3.0 million and $3.4 million of non-cash interest expense, respectively, related to the amortization of the debt discount and debt issuance costs

NOTE 6 — PROPERTY AND EQUIPMENT, NET

Property and equipment, net, consisted of the following:

	June 30, 2013			December 31, 2012
Leasehold improvements	$	11,959		$	9,057
Furniture and fixtures		3,944			2,648
Computer equipment and software		3,606			3,166
Laboratory equipment		244			244
Construction in progress		138			281
		19,891			15,396
Less: Accumulated depreciation and amortization		(3,567	)		(2,134	)
Total	$	16,324		$	13,262

NOTE 7 — ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

Accrued expenses and other current liabilities consisted of the following:

	June 30, 2013		December 31, 2012
Clinical and preclinical trials	$	29,043	$	25,150
Payroll and payroll-related		12,682		13,439
Royalties payable		4,809		2,296
Interest payable		1,698		1,698
Accrued professional services and other current liabilities		9,253		6,368
Total	$	57,485	$	48,951

NOTE 8 — STOCKHOLDERS’ EQUITY

(a) Stock Purchase Rights

All shares of the Company’s common stock, if issued prior to the termination by the Company of its rights agreement, dated as of December 4, 2006, include stock purchase rights. The rights are exercisable only if a person or group acquires twenty percent or more of the Company’s common stock or announces a tender or exchange offer which would result in ownership of twenty percent or more of the Company’s common stock. Following the acquisition of twenty percent or more of the Company’s common stock, the holders of the rights, other than the acquiring person or group, may purchase Medivation common stock at half of its fair market value. In the event of a merger or other acquisition of the Company, the holders of the rights, other than the acquiring person or group, may purchase shares of the acquiring entity at half of their fair market value. The rights were not exercisable at June 30, 2013.

(b) Medivation Equity Incentive Plan

The Medivation Equity Incentive Plan, which is stockholder-approved, provides for the issuance of options and other stock-based awards, including restricted stock units, performance share awards and stock appreciation rights. The Medivation Equity Incentive Plan is administered by the Board, or a committee appointed by the Board, which determines recipients and types of awards to be granted, including the number of shares subject to the awards, the exercise price and the vesting schedule. The vesting of all outstanding awards under the Medivation Equity Incentive Plan, including all outstanding options, restricted stock units, performance share awards and stock appreciation rights will accelerate, and all such share awards will become immediately exercisable, upon a “change of control” of Medivation, as defined in the Medivation Equity Incentive Plan.

On July 13, 2012, the Company’s stockholders approved an amendment and restatement of the Medivation Equity Incentive Plan to increase the aggregate number of shares of common stock authorized for issuance under the Medivation Equity Incentive Plan from 7,500,000 to 9,300,000. As a result of the two-for-one forward stock split described previously, the number of shares of common stock authorized for issuance under the Medivation Equity Incentive Plan was increased to 18,600,000 effective September 21, 2012. As a result of the stock split, the number of shares of the Company’s common stock issuable upon exercise of outstanding stock options and vesting of other stock-based awards was proportionally increased, and the exercise price per share thereof was proportionally decreased, in accordance with the terms of the Medivation Equity Incentive Plan.

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On June 28, 2013, the Company’s stockholders approved an amendment and restatement of the Medivation Equity Incentive Plan to increase the aggregate number of shares of common stock authorized for issuance under the Medivation Equity Incentive Plan from 18,600,000 to 19,150,000.

Stock Options

The following table summarizes stock option activity for the six months ended June 30, 2013:

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (1)
Outstanding at December 31, 2012		7,038,291		$	18.90
Granted		337,606		$	49.75
Exercised		(308,914	)	$	11.82
Forfeited		(18,104	)	$	35.56
Outstanding at June 30, 2013		7,048,879		$	20.65		6.95	$	205.8
Vested and exercisable at June 30, 2013		4,093,583		$	11.67		5.72	$	153.6

⁽¹⁾  The aggregate intrinsic value is calculated as the pre-tax difference between the weighted average exercise price of the underlying awards and the closing price per share of $49.20 of the Company’s common stock on June 28, 2013. The calculation excludes any awards with an exercise price higher than the closing price of the Company’s common stock on June 28, 2013. The amounts are presented in millions.

The weighted-average grant-date fair value per share of options granted during the six months ended June 30, 2013 was $30.57.

Restricted Stock Units

The following table summarizes restricted stock unit activity for the six months ended June 30, 2013:

	Number of Shares			Weighted- Average Grant-Date Fair Value
Unvested at December 31, 2012		373,625		$	39.06
Granted		73,993		$	50.94
Vested		—			—
Forfeited		(1,856	)	$	52.92
Unvested at June 30, 2013		445,762		$	40.98

Stock Appreciation Rights

The Company granted stock appreciation rights to certain employees pursuant to the terms of the Medivation Equity Incentive Plan. Stock appreciation rights give the holder the right, upon exercise, to receive the difference between the market price per share of the Company’s common stock at the time of exercise and the exercise price of the stock appreciation right. The exercise price of the stock appreciation right is equal to the market price of the Company’s common stock at the date of the grant. The stock appreciation rights are settlable in shares of the Company’s common stock.

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The following table summarizes stock appreciation rights activity for the six months ended June 30, 2013:

	Number of Rights			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (1)
Outstanding at December 31, 2012		883,600		$	23.91
Granted		—			—
Exercised		(22,410	)	$	23.20
Forfeited		—			—
Outstanding at June 30, 2013		861,190		$	23.93		8.48	$	21.8
Vested and exercisable at June 30, 2013		294,790		$	23.97		8.47	$	7.4

⁽¹⁾  The aggregate intrinsic value is calculated as the pre-tax difference between the weighted average exercise price of the underlying awards and the closing price per share of $49.20 of the Company’s common stock on June 28, 2013. The calculation excludes any awards with an exercise price higher than the closing price of the Company’s common stock on June 28, 2013. The amounts are presented in millions.

Performance Share Awards

There were no outstanding performance share awards under the Medivation Equity Incentive Plan at either June 30, 2013 or December 31, 2012.

Warrants

At June 30, 2013, warrants to purchase an aggregate of 45,808 shares of Medivation common stock at a weighted-average exercise price of $3.46 per share were outstanding. These outstanding warrants expire between 2014 and 2017.

Stock-Based Compensation

The Company estimates the fair value of stock options and stock appreciation rights using the Black-Scholes valuation model, which requires the use of subjective assumptions related to the estimated stock price volatility, estimated term, estimated dividend yield and risk-free interest rate. The Black-Scholes assumptions used for stock options and stock appreciation rights granted were as follows:

	Three Months Ended June 30,		Six Months Ended June 30,
	2013	2012	2013	2012
Risk-free interest rate	0.73-1.55%	0.83%	0.73-1.55%	0.83-1.01%
Estimated term (in years)	5.25-5.50	5.42	5.24-5.50	5.42-5.48
Estimated volatility	73-75%	71%	68-75%	71-73%
Estimated dividend yield	—	—	—	—

Stock-based compensation expense was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Stock-based compensation expense recognized as:
R&D expense	$	3,619	$	3,048	$	7,437	$	5,485
SG&A expense		4,512		2,533		8,990		4,432
Total	$	8,131	$	5,581	$	16,427	$	9,917

Unrecognized stock-based compensation expense totaled $77.2 million at June 30, 2013 and is expected to be recognized over a weighted-average period of 2.8 years.

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(c) Medivation Employee Stock Purchase Plan

The Medivation, Inc. 2013 Employee Stock Purchase Plan, or ESPP, which was approved by the Company’s stockholders on June 28, 2013, permits eligible employees to purchase shares of the Company’s common stock through payroll deductions at the lower of 85% of the fair market value of the stock at the beginning or ending of a purchase period. Eligible employee contributions are limited on an annual basis to $25,000 in accordance with Section 423 of the Internal Revenue Code. The first purchase period under the plan will commence on October 1, 2013 and will conclude on March 31, 2014. As of June 30, 2013, a total of 3,000,000 shares of the Company’s common stock were authorized for issuance under the ESPP and no shares have been issued.

NOTE 9 — INCOME TAXES

The Company calculates its quarterly income tax provision in accordance with the guidance provided by ASC 740-270, “Interim Income Tax Accounting,” whereby the Company forecasts its estimated annual effective tax rate and then applies that rate to its year-to-date pre-tax book income (loss). The Company’s income tax expense for the three and six months ended June 30, 2013 and 2012 was not significant.

Based upon the weight of available evidence, which includes the Company’s historical operating performance, reported cumulative net losses since inception, and expected continuing net loss, the Company has established and continues to maintain a full valuation allowance against its deferred tax assets as the Company does not currently believe that realization of those assets is more likely than not.

NOTE 10 — FAIR VALUE DISCLOSURES

The Company follows ASC 820-10, “Fair Value Measurements and Disclosures,” which among other things, defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring or nonrecurring basis. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, a three-tier fair value hierarchy has been established, which prioritizes the inputs used in measuring fair value as follows:

• Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

• Level 2—Inputs (other than quoted prices included in Level 1) are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

• Level 3—Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

The following table presents the Company’s cash equivalents and short-term investments, as well as the hierarchy for its financial instruments measured at fair value on a recurring basis:

			Fair value measurements using:
	Fair Value		Level 1		Level 2		Level 3
June 30, 2013:
Cash equivalents:
Money market funds	$	50,156	$	50,156		—		—
Short-term investments:
U.S. Treasury bills	$	144,956	$	144,956		—		—
December 31, 2012:
Cash equivalents:
Money market funds	$	48,693	$	48,693		—		—
Short-term investments:
U.S. Treasury bills	$	224,939	$	224,939		—		—

At June 30, 2013, the amortized cost and gross unrealized gain for available-for-sale securities, consisting of U.S. Treasury bills maturing in September and December of 2013, were $144.9 million and $0.0 million, respectively. At December 31, 2012, the amortized cost and gross unrealized gain for available-for-sale securities, consisting of U.S. Treasury bills maturing in March and June of 2013, were $224.9 million and $0.0 million, respectively.

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In the table below, the Company has presented the fair value of other financial instruments that are not measured at fair value on a recurring basis.

			Fair value measurements using:
	Fair Value		Level 1		Level 2		Level 3
June 30, 2013:
Assets:
Bank deposits (included in “Cash and cash equivalents”)	$	50,831	$	50,831		—		—
Liabilities:
Convertible Notes	$	237,070		—	$	237,070		—
December 31, 2012:
Assets:
Bank deposits (included in “Cash and cash equivalents”)	$	22,608	$	22,608		—		—
Liabilities:
Convertible Notes	$	234,813		—	$	234,813		—

Due to their short-term maturities, the Company believes that the fair value of its bank deposits, receivable from collaboration partner, accounts payable and accrued expenses and other current liabilities approximate their carrying value. The estimated fair value of the Company’s Convertible Notes, including the equity component, was $327.9 million at June 30, 2013 and was determined using recent trading prices of the Convertible Notes. The fair value of the Convertible Notes included in the table above represents only the liability component of the Convertible Notes, because the equity component is included in stockholders’ equity on the consolidated balance sheets.

NOTE 11 — COMMITMENTS AND CONTINGENCIES

(a) Operating Leases

In June 2013, the Company entered into the Fourth Amendment to its lease agreement, as amended, at 525 Market Street, San Francisco, California, pursuant to which it leased an additional approximately 13,000 square feet of office space that it expects to occupy beginning in January 2014. The Company is entitled to $0.4 million of tenant improvement allowances pursuant to the Fourth Amendment. In connection with the execution of the Fourth Amendment, the Company delivered to the lessor a letter of credit collateralized by restricted cash totaling $1.1 million. In total, at June 30, 2013, the Company leased approximately 98,000 square feet of office space at 525 Market Street pursuant to the lease agreement, as amended, which expires in June 2019. The Company has an option to extend the lease term for an additional five years.

The Company also leases approximately 15,000 square feet of office space in Oakbrook Terrace, Illinois for its commercial headquarters pursuant to a non-cancelable lease agreement that expires in December 2019, and utilizes approximately 14,000 square feet of laboratory space pursuant to an agreement that expires in December 2015.

The future minimum rentals under the Company’s non-cancelable operating leases at June 30, 2013 were as follows:

Years Ending December 31,	Annual Payments
2013 (remainder of year)	$	3,491
2014		7,772
2015		7,943
2016		6,250
2017		6,356
2018 and thereafter		9,832
Total	$	41,644

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In addition to the future minimum rental payments included in the table above, certain lease agreements also require the Company to make additional payments during the lease term for taxes, insurance, and other operating expenses.

(b) Restricted Cash

The Company had outstanding letters of credit collateralized by restricted cash totaling $10.2 million and $9.2 million at June 30, 2013 and December 31, 2012, respectively, to secure various operating leases. At June 30, 2013, $0.3 million and $9.9 million of restricted cash associated with these letters of credit were classified as current and long-term assets, respectively, on the consolidated balance sheets. At December 31, 2012, $0.3 million and $8.8 million of restricted cash associated with these letters of credit were classified as current and long-term assets, respectively, on the consolidated balance sheets.

(c) License Agreement with UCLA

Under an August 2005 license agreement with UCLA, and subsequent amendments to this agreement, the Company’s subsidiary Medivation Prostate Therapeutics, Inc. holds an exclusive worldwide license under several UCLA patents and patent applications covering XTANDI and related compounds. Under the Astellas Collaboration Agreement, the Company granted Astellas a sublicense under the patent rights licensed to it by UCLA.

The Company is required to pay UCLA (a) an annual maintenance fee, (b) $2.8 million in aggregate milestone payments upon achievement of certain development and regulatory milestone events with respect to XTANDI (all of which has been paid as of June 30, 2013), (c) ten percent of the remaining $257.0 million in development milestone payments that the Company is eligible to earn under the Astellas Collaboration Agreement, and (d) a four percent royalty on global net sales of XTANDI. Under the terms of the Astellas Collaboration Agreement, the Company shares this royalty obligation with Astellas 50/50 with respect to sales in the United States, and Astellas bears this entire royalty obligation with respect to sales outside of the United States. In addition, in ongoing litigation initiated by the Company, UCLA has filed a cross-complaint alleging that the Company is also required to share with it ten percent of the $320.0 million in sales milestone payments that the Company is eligible to earn under the Astellas Collaboration Agreement. Additional information about this litigation is included below.

UCLA may terminate the agreement if the Company does not meet a general obligation to diligently proceed with the development, manufacturing and sale of licensed products, or if it commits any other uncured material breach of the agreement. The Company may terminate the agreement at any time upon advance written notice to UCLA. If neither party terminates the agreement early, the agreement will continue in force until the expiration of the last-to-expire patent.

(d) Litigation

The Company is party to legal proceedings, investigations, and claims in the ordinary course of its business, including the matters described below. The Company records accruals for outstanding legal matters when it believes that it is both probable that a liability has been incurred and the amount of such liability can be reasonably estimated. The Company evaluates, on a quarterly basis, developments in legal matters that could affect the amount of any accrual and developments that would make a loss contingency both probable and reasonably estimable. To the extent new information is obtained and the Company’s views on the probable outcomes of claims, suits, assessments, investigations or legal proceedings change, changes in the Company’s accrued liabilities would be recorded in the period in which such determination is made. For the matters described below, the liability is not probable or the amount cannot be reasonably estimated; and, therefore, accruals have not been made. In addition, in accordance with the relevant authoritative guidance, for matters for which the likelihood of material loss is at least reasonably possible, the Company provides disclosure of the possible loss or range of loss; however, if a reasonable estimate cannot be made, the Company will provide disclosure to that effect.

In March 2010, the first of several putative securities class action lawsuits was commenced in the U.S. District Court for the Northern District of California, naming as defendants the Company and certain of its officers. The lawsuits are largely identical and allege violations of the Securities Exchange Act of 1934, as amended. The plaintiffs allege, among other things, that the defendants disseminated false and misleading statements about the effectiveness of dimebon for the treatment of Alzheimer’s disease. The plaintiffs purport to seek damages, an award of their costs and injunctive relief on behalf of a class of stockholders who purchased or otherwise acquired the Company’s common stock between September 21, 2006 and March 2, 2010. The actions were consolidated in September 2010 and, in April 2011 the court entered an order appointing Catoosa Fund, L.P. and its attorneys as lead plaintiff and lead counsel. Thereafter, the lead plaintiff filed a consolidated amended complaint, which was dismissed without prejudice as to all defendants in August 2011. The lead plaintiff filed a second amended complaint in November 2011. In March 2012, the court dismissed the second amended complaint with prejudice and entered judgment in favor of defendants. Lead plaintiff filed a notice of appeal to the U.S. Circuit Court of Appeals for the Ninth Circuit in April 2012. The appeal is fully briefed, and the Company is awaiting notice of the date for oral argument.

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In May 2011, the Company filed a lawsuit in San Francisco Superior Court against the Regents of the University of California, or the Regents, and one of its professors, alleging breach of contract and fraud claims, among others. The Company’s allegations in this lawsuit include that it has exclusive commercial rights to an investigational drug known as ARN-509, which is currently being developed by Aragon Pharmaceuticals, or Aragon. On June 17, 2013, Johnson & Johnson announced it entered into a definitive agreement with Aragon to acquire all ARN-509 assets currently owned by Aragon. ARN-509 is a close structural analog of XTANDI, was developed contemporaneously with XTANDI in the same academic laboratories in which XTANDI was developed, and was purportedly licensed by the Regents to Aragon, a company co-founded by the heads of the academic laboratories in which XTANDI was developed. On February 9, 2012, the Company filed a Second Amended Complaint, adding as additional defendants a former Regents professor and Aragon. The Company seeks remedies including a declaration that it is the proper licensee of ARN-509, contractual remedies conferring to it exclusive patent license rights regarding ARN-509, and other equitable and monetary relief. On August 7, 2012, the Regents filed a cross-complaint against the Company seeking declaratory relief which, if granted, would require the Company to share with the Regents 10% of any sales milestone payments the Company may receive under the Astellas Collaboration Agreement. Under the Astellas Collaboration Agreement, the Company is eligible to receive up to $320.0 million in sales milestone payments. On September 18, 2012, the trial court approved a settlement agreement dismissing the former Regents professor who was added to the case on February 9, 2012. On December 20, 2012 and January 25, 2013, the Court granted summary judgment motions filed by defendants Regents and Aragon, resulting in dismissal of all claims against Regents and Aragon, but denied such motions filed by the remaining Regents professor. On April 15, 2013, the Company filed a Notice of Appeal seeking appeal of the judgment in favor of Aragon. Medivation will file a Notice of Appeal of the summary judgment rulings in favor of Regents after the final judgment is entered on the Regent’s cross-complaint. The bench trial of the Regent’s cross-complaint against the Company was conducted in July 2013, and the Company is awaiting a decision from the Court. The jury trial of the Company’s fraud and breach of contract claims against the remaining Regents professor is scheduled to commence in October 2013.

While the Company believes it has meritorious positions with respect to the claims asserted against it and intends to advance its positions in these lawsuits vigorously, including on appeal, the process of resolving matters through litigation or other means is inherently uncertain, and it is not possible to predict the ultimate resolution of any such proceeding. The actual cost of defending the Company’s position may be significant, and the Company may not prevail. The Company believes it is entitled to coverage under its relevant insurance policies with respect to the putative securities class action lawsuits, subject to a $350,000 retention, but coverage could be denied or prove to be insufficient.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

The following discussion and analysis should be read in conjunction with our audited consolidated financial statements and notes thereto for the fiscal year ended December 31, 2012, included in our Annual Report on Form 10-K, or Annual Report, for the year ended December 31, 2012. The following discussion and analysis contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. We intend that these forward-looking statements be subject to the safe harbors created by those provisions. Forward-looking statements are generally written in the future tense and/or are preceded by words such as “may,” “should,” “could,” “expect,” “believe,” “estimate,” “anticipate,” “intend,” “plan,” or similar words, or negatives of such terms or variations on such terms of comparable terminology. These forward-looking statements include, but are not limited to, statements regarding the commercialization of XTANDI^® (enzalutamide) capsules, or XTANDI, and the continuation and success of our collaboration with Astellas Pharma, Inc., or Astellas. The forward-looking statements contained in this Quarterly Report on Form 10-Q, or Quarterly Report, involve a number of risks, uncertainties and assumptions, many of which are outside of our control. Factors that could cause actual results to differ materially from projected results include, but are not limited to, those discussed in “Risk Factors” in Item 1A of Part II below. Readers are expressly advised to review and consider those Risk Factors. Although we believe that the assumptions underlying the forward-looking statements contained in this Quarterly Report are reasonable, any of the assumptions could be inaccurate, and therefore there can be no assurance that the results predicted by such statements will occur. In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of such information should not be regarded as a representation by us or any other person that the results or conditions described in such statements or our objectives and plans will be achieved. Furthermore, past performance in operations, trading price of our common stock or of our 2.625% convertible senior notes due on April 17, 2017, or the Convertible Notes, is not necessarily indicative of future performance. We disclaim any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Overview

We are a biopharmaceutical company focused on the rapid development and commercialization of novel therapies to treat serious diseases for which there are limited treatment options. We select technologies for development that meet three primary criteria, namely, the technology has: (a) in the judgment of our scientific leadership, an above-average likelihood of working; (b) strong intellectual property and/or data exclusivity protection; and (c) the ability to target one or more serious diseases for which existing treatments are suboptimal. When selecting technologies for development, we focus primarily on those we believe have the ability to enter human studies within 12-18 months. We consider technologies without regard to therapeutic indication or therapeutic modality (i.e., small molecules, biologics, medical devices, etc). We may develop technologies through our own internal research activities, or in-license technologies from academic institutions or other third parties. Once we select a technology for development, we seek to advance it quickly, strategically and cost-effectively to commercialization. Our commercialization strategy for any of our product candidates that receives marketing approval will vary depending on the target customer base for that product candidate, our then current internal commercial capabilities, the extent to which we deem it prudent and cost-effective to build additional internal commercial capabilities, and the availability, quality and cost of third-party commercialization partners.

Our most advanced program is XTANDI^® (enzalutamide) capsules, or XTANDI, which we have partnered with Astellas Pharma Inc., or Astellas. We in-licensed the intellectual property rights covering XTANDI in 2005, began our first clinical trial in 2007, entered into our collaboration agreement with Astellas, or the Astellas Collaboration Agreement, in 2009, reported positive Phase 3 overall survival data in 2011 in patients with metastatic castration-resistant prostate cancer, or mCRPC, who have previously received docetaxel, or post-chemotherapy mCRPC patients, and on August 31, 2012, received regulatory approval from the U.S. Food and Drug Administration, or FDA, for the treatment of post-chemotherapy mCRPC. We and Astellas began co-promoting XTANDI for that indication in the United States on September 13, 2012. On June 24, 2013, we announced that XTANDI was granted marketing authorization in the European Union, or EU, for the treatment of adult men with mCRPC whose disease has progressed on or after docetaxel therapy. XTANDI is approved in Canada and South Korea for the post-docetaxel indication and marketing applications for XTANDI are under review in Argentina, Australia, Brazil, Japan, South Africa and Switzerland. Together with Astellas, we are also conducting multiple trials of enzalutamide in earlier prostate cancer disease states, including the Phase 3 PREVAIL trial in patients with mCRPC who have not received chemotherapy, or pre-chemotherapy mCRPC patients, and in patients with metastatic breast cancer. We also have ongoing programs with other agents in multiple different indications in the early stages of research and development. These early-stage programs are unpartnered.

In January 2012, our former collaboration partner Pfizer, Inc., or Pfizer, exercised its right to terminate our collaboration agreement for the development and commercialization of dimebon for the treatment of Alzheimer’s disease and Huntington disease, due to negative Phase 3 trial results in both indications. We and Pfizer discontinued development of dimebon for all indications in January 2012, and completed the wind-down of our respective remaining collaboration activities in the third quarter of 2012.

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Financial History

On August 31, 2012, the FDA approved XTANDI for the treatment of post-chemotherapy mCRPC patients. This was the first marketing approval for XTANDI anywhere in the world. We and our collaboration partner Astellas commenced commercial sales of XTANDI in the United States on September 13, 2012. We did not generate any collaboration revenue attributable to XTANDI sales until the quarter ended September 30, 2012. We have funded our operations primarily through public offerings of our common stock, the issuance of our Convertible Notes, up-front, development milestone and cost-sharing payments under the Astellas Collaboration Agreement and our former collaboration agreement with Pfizer and, subsequent to September 13, 2012, from collaboration revenue attributable to XTANDI sales.

We have incurred cumulative net losses of $323.6 million through June 30, 2013, and expect to incur substantial additional losses as we continue to finance the commercialization of XTANDI in the U.S market, clinical and preclinical studies of enzalutamide and our early-stage technologies, and our corporate overhead costs. We do not know when, or if, we will become profitable, or whether XTANDI will be approved for sale in the United States, EU, Canada or South Korea for any indication other than treatment of post-chemotherapy mCRPC patients or will be approved for sale in any other market for any indication.

Second Quarter 2013 Business Highlights

• On May 24, 2013, we announced that Astellas submitted an application for marketing approval of enzalutamide in Japan for the treatment of prostate cancer, which was subsequently granted priority review. This submission triggered a $5.0 million milestone payment from Astellas that we received and recognized as collaboration revenue during the second quarter of 2013.

• On June 3, 2013, we announced that Health Canada approved XTANDI for the treatment of men with mCRPC in the setting of medical or surgical castration who have received docetaxel therapy.

• On June 24, 2013, we announced that the European Commission, or EC, granted marketing authorization for XTANDI in the EU market for the treatment of adult men with mCRPC whose disease has progressed on or after docetaxel therapy. This approval triggered a $15.0 million milestone from Astellas that we earned and recognized as collaboration revenue during the second quarter of 2013. This milestone payment was received during the third quarter of 2013.

• On June 26, 2013, we announced enrollment of the first patient in a global Phase 2 clinical trial evaluating enzalutamide as a single agent for the treatment of advanced, androgen receptor positive, triple-negative breast cancer. The primary endpoint of the trial, which plans to enroll approximately 80 patients at sites in the United States, Canada and Europe, is clinical benefit rate, defined as the proportion of patients with a best response of complete response, partial response or stable disease at ³ 16 weeks.

2013 Financial Highlights

• Net sales for XTANDI in the United States for the three months ended June 30, 2013, as reported by Astellas, were $82.4 million, an increase of $7.0 million, or 9%, from the quarter ended March 31, 2013. Net sales for XTANDI in the United States for the six months ended June 30, 2013, as reported by Astellas, were $157.8 million.

• Net sales of XTANDI outside the United States for the three months ended June 30, 2013, as reported by Astellas, were $3.7 million. No ex-U.S. XTANDI sales were recorded in prior periods.

• Collaboration revenue for the three and six months ended June 30, 2013 was $70.1 million and $116.3 million, respectively, an increase of $27.2 million, or 63%, and $36.6 million, or 46%, respectively, from the prior year periods.

• Total operating expenses for the three and six months ended June 30, 2013 were $70.1 million and $138.6 million, respectively, an increase of $26.2 million, or 60%, and $59.0 million, or 74%, respectively, from the prior year periods. Operating expenses included non-cash stock-based compensation of $8.1 million and $16.4 million for the three and six months ended June 30, 2013, respectively, an increase of $2.6 million, or 46%, and $6.5 million, or 66%, respectively, from the prior year periods.

• Cash, cash equivalents and short-term investments were $245.9 million at June 30, 2013, a decrease of $50.3 million, or 17%, from $296.2 million at December 31, 2012.

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Critical Accounting Policies and the Use of Estimates

The preparation of our consolidated financial statements and related footnotes requires us to make estimates, assumptions and judgments in certain circumstances that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. We have based our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. We have discussed the development, selection and disclosure of these estimates with the Audit Committee of our Board of Directors. Actual results could differ materially from these estimates under different assumptions or conditions. A detailed description of our significant accounting policies is included in the footnotes to our audited consolidated financial statements included in our Annual Report.

An accounting policy is considered to be critical if it requires an accounting estimate to be made based on assumptions about matters that are highly uncertain at the time the estimate is made, and if different estimates that reasonably could have been used, or changes in the accounting estimates that are reasonably likely to occur periodically, could materially impact the consolidated financial statements. We believe that certain of our accounting policies are critical because they are the most important to the preparation of our consolidated financial statements. These policies require our most subjective and complex judgments, often requiring the use of estimates about the effects of matters that are inherently uncertain. Our critical accounting policies have been consistently applied during the periods presented.

We have identified our most critical accounting policies and estimates upon which our financial statements depend as those relating to: revenue recognition, including estimates of the various deductions from gross sales used to calculate net sales of XTANDI, reliance on third-party information, and the estimated performance periods under the Astellas Collaboration Agreement and our former collaboration agreement with Pfizer; stock-based compensation; research and development expenses and accruals; litigation; Convertible Notes, including our estimate of how the net proceeds thereof should be bifurcated between the debt component and the equity component; and income taxes. For a discussion of our critical accounting policies and use of estimates, please refer to Part II, Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in our Annual Report.

Recent Accounting Pronouncements

Information regarding recent accounting pronouncements applicable to us is included in Note 2 to our unaudited consolidated financial statements included elsewhere in this Quarterly Report.

Results of Operations

Collaboration Revenue

Collaboration revenue consists of three components: (a) collaboration revenue attributable to U.S. XTANDI sales; (b) collaboration revenue attributable to ex-U.S. XTANDI sales; and (c) collaboration revenue attributable to up-front and milestone payments.

Collaboration revenue was as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Collaboration revenue:
Attributable to U.S. XTANDI sales	$	41,201	$	—	$	78,890	$	—
Attributable to ex-U.S. XTANDI sales		482		—		482		—
Attributable to up-front and milestone payments		28,466		42,912		36,931		79,737
Total	$	70,149	$	42,912	$	116,303	$	79,737

Collaboration Revenue Attributable to U.S. XTANDI Sales

Under the Astellas Collaboration Agreement, Astellas records all U.S. XTANDI sales. We and Astellas share equally all pre-tax profits and losses from U.S. XTANDI sales. Subject to certain exceptions, we and Astellas also share equally all XTANDI development and commercialization costs attributable to the U.S. market, including cost of goods sold and the royalty on net sales payable to UCLA under our XTANDI license agreement. The primary exceptions to 50/50 cost sharing are that each party bears its own commercial full time equivalent, or FTE, costs, and that development costs supporting regulatory approvals in both the United States and either Europe or Japan are borne one-third by us and two-thirds by Astellas. Both we

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and Astellas are entitled to receive a fee for each qualifying detail made by our respective sales representatives. We recognize collaboration revenue attributable to U.S. XTANDI sales in the period in which such sales occur. Collaboration revenue attributable to U.S. XTANDI sales consists of our share of pre-tax profits and losses from U.S. sales, plus reimbursement of our share of reimbursable U.S. development and commercialization costs. Our collaboration revenue attributable to U.S. XTANDI sales in any given period will be mathematically equal to 50% of U.S. XTANDI net sales as reported by Astellas for the applicable period.

Under the Astellas Collaboration Agreement, the deductions from gross sales used to derive net sales of XTANDI are determined in a manner consistent with GAAP, consistently applied. The largest component of the deductions used in deriving net sales is legally mandated discounts or rebates to Medicare and other government payors. Because the indicated patient population for XTANDI consists largely of men over the age of 65, we believe that a significant portion of these men are Medicare beneficiaries. The estimates used in calculating gross-to-net deductions will be reassessed periodically and trued-up as appropriate based on actual deductions.

Net sales of XTANDI in the United States for the three months ended June 30, 2013, as reported by Astellas, were $82.4 million, an increase of $7.0 million, or 9%, from the three months ended March 31, 2013. The increase in net sales was primarily the result of an increase in unit volume, partially offset by a higher gross-to-net adjustment rate during the second quarter. U.S. net sales of XTANDI of $75.4 million in the first quarter included a favorable gross-to-net adjustment of $4.4 million relating to prior quarters. XTANDI first became available for shipment on September 13, 2012, and therefore there was no collaboration revenue attributable to U.S. XTANDI sales for the three and six months ended June 30, 2012.

Collaboration revenue attributable to U.S. XTANDI sales was as follows (in thousands):

	Three Months Ended June 30, 2013			Six Months Ended June 30, 2013
Net U.S. sales (as reported by Astellas)	$	82,402		$	157,780
Shared U.S. development and commercialization costs		(61,431	)		(119,101	)
Pre-tax U.S. profit	$	20,971		$	38,679
Medivation’s share of pre-tax U.S. profit	$	10,486		$	19,340
Reimbursement of Medivation’s share of shared U.S. costs		30,715			59,550
Collaboration revenue attributable to U.S. XTANDI sales	$	41,201		$	78,890

Collaboration Revenue Attributable to Ex-U.S. XTANDI Sales

Under the Astellas Collaboration Agreement, Astellas records all ex-U.S. XTANDI sales. Astellas is responsible for all development and commercialization costs for XTANDI outside the U.S., including cost of goods sold and the royalty on net sales payable to UCLA under our license agreement with UCLA, and pays us a tiered royalty ranging from the low teens to the low twenties on net ex-U.S. XTANDI sales. We recognize collaboration revenue attributable to ex-U.S. XTANDI sales in the period in which such sales occur. Collaboration revenue attributable to ex-U.S. XTANDI sales consists of royalty payments from Astellas on those sales.

Collaboration revenue attributable to ex-U.S. XTANDI sales was $0.5 million for the three and six months ended June 30, 2013. There was no collaboration revenue attributable to ex-U.S. XTANDI sales for the three and six months ended June 30, 2012.

Collaboration Revenue Attributable to Up-front and Milestone Payments

We record non-refundable, up-front payments under our current and former collaboration agreements as deferred revenue and recognize these payments as collaboration revenue on a straight-line basis over the applicable estimated performance period. We recognize as revenue milestone payments earned by us under the Astellas Collaboration Agreement in their entirety in the period in which the underlying milestone event is achieved, except that any milestone payments that (a) are related to the performance of our deliverables under the Astellas Collaboration Agreement, (b) are triggered by events that occur during the performance period under the Astellas Collaboration Agreement, and (c) do not constitute substantive milestones, which we record as deferred revenue and recognize as collaboration revenue on a straight-line basis over the expected performance period.

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Collaboration revenue attributable to up-front and milestone payments was as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Collaboration revenue attributable to up-front and milestone payments:
From Astellas	$	28,466	$	7,256	$	36,931	$	13,193
From Pfizer		—		35,656		—		66,544
Total	$	28,466	$	42,912	$	36,931	$	79,737

Collaboration revenue attributable to up-front and milestone payments from Astellas was $28.5 million and $36.9 million for the three and six months ended June 30, 2013, respectively, an increase of $21.2 million, or 292%, and $23.7 million, or 180%, from the prior year periods. These increases were primarily attributable to $20.0 million in milestone payments from Astellas recognized as collaboration revenue during the second quarter of 2013, consisting of $5.0 million triggered by the submission of an application to market enzalutamide for prostate cancer patients in Japan and $15.0 million triggered by the approval of XTANDI in the EU market. We are required to share 10% of these milestone payments with UCLA pursuant to the terms of our license agreement.

Collaboration revenue attributable to the up-front payment from Pfizer for the three and six months ended June 30, 2012 was $35.7 million and $66.5 million, respectively. Amortization of the entire Pfizer up-front payment was completed upon completion of our performance obligations in the third quarter of 2012.

Deferred revenue under the Astellas Collaboration Agreement consisted of the following (in thousands):

	June 30, 2013		December 31, 2012
Current	$	25,396	$	33,862
Long-term		—		8,465
Total	$	25,396	$	42,327

Research and Development Expenses

Research and development, or R&D, expenses were as follows (dollars in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Research and development expenses	$	28,205		$	21,550	$	53,113		$	41,580
Percentage change		31	%				28	%

R&D expenses increased by $6.7 million, or 31%, to $28.2 million for the three months ended June 30, 2013 from $21.6 million for the prior year period. The increase was primarily due to increased personnel-related costs of $2.1 million due to higher staffing levels, a $2.0 million increase in development milestones to UCLA and increased clinical and preclinical development costs of $1.5 million.

R&D expenses increased by $11.5 million, or 28%, to $53.1 million for the six months ended June 30, 2013 from $41.6 million for the prior year period. The increase was primarily due to increased personnel-related costs of $6.3 million due to higher staffing levels and payroll-related costs, increased clinical and preclinical development costs of $2.1 million and a $2.0 million increase in development milestones to UCLA.

R&D expenses represented 40% and 38% of total operating expenses for the three and six months ended June 30, 2013, respectively, compared to 49% and 52% of total operating expenses for the three and six months ended June 30, 2012, respectively. R&D headcount increased to 133 full-time employees at June 30, 2013 from 95 full-time employees at June 30, 2012.

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Under both the Astellas Collaboration Agreement and our former collaboration agreement with Pfizer, we and our collaboration partners share certain development costs in the United States. The parties make quarterly cost-sharing payments to one another in amounts necessary to ensure that each party bears its contractual share of the shared U.S. development costs incurred. We recorded development cost-sharing payments from Astellas and Pfizer, and corresponding reductions in R&D expense, as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Development cost-sharing payments from Astellas	$	11,309	$	14,013	$	18,547	$	28,128
Development cost-sharing payments from Pfizer		—		362		—		1,689
Total	$	11,309	$	14,375	$	18,547	$	29,817

We have been engaged in two major R&D programs: the development of XTANDI for the treatment of prostate and breast cancer and the development of dimebon for the treatment of Alzheimer’s disease and Huntington disease. Other R&D programs consist of early stage programs. R&D costs are identified as either directly allocable to one of our R&D programs or an indirect cost, with only direct costs being tracked by specific program. Direct costs consist primarily of clinical and preclinical study costs, cost of supplying drug substance and drug product for use in clinical and preclinical studies, milestone-related payments to the licensor of our enzalutamide technology, personnel costs (including both cash costs and non-cash stock-based compensation costs), contract research organization fees, and other contracted services pertaining to specific clinical and preclinical studies. Indirect costs consist of corporate overhead costs and other administrative and support costs. The following table summarizes the direct costs attributable to each program and total indirect costs (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Direct costs:
XTANDI (enzalutamide)	$	18,244	$	15,144	$	35,414	$	28,659
Dimebon (1)		—		696		—		1,711
Other		7,264		4,126		13,140		7,786
Total direct costs		25,508		19,966		48,554		38,156
Indirect costs		2,697		1,584		4,559		3,424
Total	$	28,205	$	21,550	$	53,113	$	41,580

⁽¹⁾  We and Pfizer discontinued development of dimebon for all indications in January 2012, and completed the wind-down of each of our respective remaining collaboration activities in the third quarter of 2012.

Our projects or intended projects may be subject to change from time to time as we evaluate our R&D priorities and available resources.

To obtain the necessary regulatory approvals, we will need to establish to the satisfaction of the applicable regulatory authorities in the United States, Europe and other relevant regions that the applicable product candidate is both safe and effective for each of its intended indications. The process of conducting the preclinical and clinical testing required to establish safety and efficacy and obtain regulatory approvals is expensive, uncertain and takes many years. We are not able to reasonably estimate the time or cost required in obtaining such regulatory approvals, and failure to receive the necessary regulatory approvals would prevent us from commercializing the product candidates affected, for either some or all of the indications for which they are being developed. The length of time required for clinical development of a particular product candidate and our development costs for that product candidate may be impacted by the scope and timing of enrollment in clinical trials for the product candidate, unanticipated additional clinical trials that may be required, future decisions to develop a product candidate for subsequent indications, and whether in the future we decide to pursue development of the product candidate with a corporate partner or independently. For example, XTANDI may have the potential to be approved for multiple indications, and we do not yet know how many of those indications we and our partner, Astellas, will pursue. The decision to pursue regulatory approval for subsequent indications will depend on several variables outside of our control, including the strength of the data generated in our prior and ongoing clinical and non-clinical studies and both our and our partners’ willingness to jointly fund such additional work. Furthermore, the scope and number of clinical studies required to obtain regulatory approval for each

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pursued indication is subject to the input of the applicable regulatory authorities; we have not yet sought such input for all potential indications that we and our collaboration partner may elect to pursue, and even after having given such input applicable regulatory authorities may subsequently require additional clinical studies prior to granting regulatory approval based on new data generated by us or other companies, or for other reasons outside of our control. Moreover, we or our current or potential future collaboration partners may decide to discontinue development of any development project at any time for regulatory, commercial, scientific or other reasons.

For a detailed discussion of the risks and uncertainties associated with the timing and cost of completing a product development plan, see Part II Item 1A, “Risk Factors—Risks Related to Our Future Product Development Candidates” of this Quarterly Report.

Selling, General and Administrative Expenses

Selling, general and administrative, or SG&A, expenses were as follows (dollars in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Selling, general and administrative expenses	$	41,890		$	22,337	$	85,458		$	38,024
Percentage change		88	%				125	%

SG&A expenses increased by $19.6 million, or 88%, to $41.9 million in the three months ended June 30, 2013 from $22.3 million in the prior year period. The increase was primarily due to an $8.9 million increase in third-party sales and marketing expenses to support the U.S. commercial launch of XTANDI, increased personnel-related costs of $6.9 million primarily resulting from higher staffing levels to support the U.S. commercial launch of XTANDI, $1.7 million of royalty expense to UCLA, increased legal fees of $0.9 million relating to our pending litigation against UCLA, one of its professors and Aragon Pharmaceuticals, Inc., and $0.7 million of cost-sharing payments to Astellas for XTANDI cost of goods sold.

SG&A expenses increased by $47.5 million, or 125%, to $85.5 million in the six months ended June 30, 2013 from $38.0 million in the prior year period. The increase was primarily due to a $20.4 million increase in third-party sales and marketing expenses to support the U.S. commercial launch of XTANDI, increased personnel-related costs of $19.3 million primarily resulting from higher staffing levels to support the U.S. commercial launch of XTANDI and payroll-related costs, $3.0 million of royalty expense to UCLA, increased legal fees of $2.1 million relating to our pending litigation against UCLA, one of its professors and Aragon Pharmaceuticals, Inc., and $1.3 million of cost-sharing payments to Astellas for XTANDI cost of goods sold.

SG&A expenses represented 60% and 62% of total operating expenses for the three and six months ended June 30, 2013 and 2012, respectively, compared to 51% and 48% for the three and six months ended June 30, 2012, respectively. SG&A headcount increased to 176 full-time employees at June 30, 2013 from 150 full-time employees at June 30, 2012.

Under both the Astellas Collaboration Agreement and the former collaboration agreement with Pfizer, we and our collaboration partners share certain commercialization costs in the United States. The parties make quarterly cost-sharing payments to one another in amounts necessary to ensure that each party bears its contractual share of the shared U.S. commercialization costs incurred. We recorded commercialization cost-sharing payments (to) from Astellas and Pfizer, and corresponding (increases) reductions in SG&A expenses, as follows (in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Commercialization cost-sharing payments (to) from Astellas	$	(3,791	)	$	146	$	(8,576	)	$	(670	)
Commercialization cost-sharing payments from Pfizer		—			5		—			9
Total	$	(3,791	)	$	151	$	(8,576	)	$	(661	)

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Other Income (Expense), Net

The components of other income (expense), net were as follows (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Other income (expense):
Coupon interest expense on Convertible Notes	$	(1,698	)	$	(1,698	)	$	(3,396	)	$	(1,924	)
Non-cash amortization of debt discount and issuance costs on Convertible Notes		(3,284	)		(2,990	)		(6,474	)		(3,349	)
Interest income		52			56			126			83
Other income (expense), net		10			83			9			(15	)
Total	$	(4,920	)	$	(4,549	)	$	(9,735	)	$	(5,205	)

Other income (expense), net consists of coupon interest expense and non-cash interest expense on our Convertible Notes, which were issued in March 2012, interest income on our cash equivalents and short-term investment balances, and the impact of changes in foreign exchange rates on our foreign currency-denominated payables. The impact of foreign exchange rates on our results of operations fluctuates from period to period based upon our foreign currency exposures resulting from changes in applicable foreign exchange rates associated with our foreign currency denominated payables and was not significant during the periods presented.

Income Tax (Expense) Benefit

Income tax (expense) benefit and the effective income tax rate were as follows (dollars in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Income tax (expense) benefit	$	(32	)	$	24		$	(65	)	$	12
Effective income tax rate		0.66	%		(0.43	)%		0.20	%		(0.23	)%

Income tax (expense) benefit for the three and six months ended June 30, 2013 and 2012 was not significant.

Liquidity and Capital Resources

Sources of Liquidity and Access to Capital

We have incurred cumulative net losses of $323.6 million since inception through June 30, 2013, and expect to incur substantial additional losses for the foreseeable future as we continue to finance the commercialization of XTANDI in the U.S. market, clinical and preclinical studies of enzalutamide and our early-stage technologies, and our corporate overhead costs. Our operating losses have had and will continue to have an adverse impact on our working capital, total assets, and stockholders’ equity. We and our collaboration partner Astellas commenced commercial sales of XTANDI in the United States for the treatment of post-chemotherapy mCRPC patients on September 13, 2012. XTANDI’s sales and profit potential is unproven. We did not generate any collaboration revenue attributable to U.S. XTANDI sales until the third quarter of 2012 and we did not generate any collaboration revenue attributable to ex-U.S. XTANDI sales until the second quarter of 2013. We do not know when, or if, we will become profitable, or whether XTANDI will be approved for sale in the United States, EU, Canada or South Korea for any indication other than treatment of post-chemotherapy mCRPC patients or will be approved for sale in any other market for any indication. We may never achieve profitability and even if we do, we may not be able to sustain or increase profitability on a quarterly or annual basis. We have funded our operations primarily through public offerings of our common stock, the issuance of our Convertible Notes, from the up-front, development milestone and cost-sharing payments under the Astellas Collaboration Agreement and our former collaboration agreement with Pfizer and, subsequent to September 13, 2012, from collaboration revenue attributable to XTANDI sales.

At June 30, 2013, our cash, cash equivalents and short-term investments were $245.9 million. Our cash and investment policy emphasizes liquidity and preservation of principal over other portfolio considerations. We invest our cash equivalents in highly liquid money market accounts and our short-term investments in highly liquid U.S. treasury securities. Based on our current expectations, we believe our capital resources at June 30, 2013 combined with our anticipated future cash flows will be sufficient to fund our currently planned operations for at least the next 12 months. This estimate is based on a number of

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assumptions that may prove to be wrong, including assumptions regarding net sales of XTANDI, potential XTANDI approvals in new markets and for other indications and potential receipt of profit-sharing, royalty and milestone payments under our Astellas Collaboration Agreement, and we could exhaust our available cash, cash equivalents and short-term investments earlier than presently anticipated. For example, we may be required or choose to seek additional capital to fund the costs of commercialization of XTANDI in the U.S., to expand our preclinical and clinical development activities for enzalutamide and other existing or potential future product candidates, if we face challenges or delays in connection with our clinical trials, to maintain minimum cash balances that we deem reasonable and prudent, or in the event a fundamental change occurs under the terms of the Convertible Notes, which would give the holders of the Convertible Notes the right to require us to purchase their Convertible Notes in cash. In addition, we intend to evaluate the capital markets from time to time to determine whether to raise additional capital in the form of equity, convertible debt or otherwise, depending on market conditions relative to our need for funds at such time, and we may seek to raise additional capital at any time should we conclude that such capital is available on terms that we consider to be in the best interests of our company and our stockholders.

We may seek to raise additional funds through public or private financing or other arrangements, as our development programs or other operations may require. Our ability to raise additional finds on acceptable terms will be dependent on the climate of worldwide capital markets, which could be challenging. Any additional equity financing would be dilutive to stockholders, and debt financing, if available, may involve restrictive covenants and increase our interest expense, leverage and operating and financial costs. Our failure to raise capital when needed may harm our business and operating results.

For a detailed discussion of the risks and uncertainties associated with our sources of liquidity and access to capital, see Part II, Item 1A, “Risk Factors—Risks Related to the Operation of Our Business.”

Cash Flow Analysis

The following table summarizes our cash flows (in thousands):

	Six Months Ended June 30,
	2013			2012
Net cash (used in) provided by:
Operating activities	$	(48,330	)	$	(55,761	)
Investing activities		74,367			(131,555	)
Financing activities		3,649			261,699
Net change in cash and cash equivalents	$	29,686		$	74,383

Net cash used in operating activities totaled $48.3 million for the six months ended June 30, 2013, which consisted of our net loss of $32.1 million and negative changes in our operating assets and liabilities of $23.7 million, partially offset by non-cash items of $7.5 million. Non-cash items consisted primarily of non-cash stock-based compensation expense of $16.4 million, non-cash interest expense on the Convertible Notes of $6.5 million and depreciation expense on property and equipment of $1.6 million, partially offset by non-cash amortization of deferred revenue of $16.9 million. The negative cash flow from changes in operating assets and liabilities of $23.7 million arose in the ordinary course of business.

Net cash used in operating activities totaled $55.8 million for the six months ended June 30, 2012, which consisted of non-cash items of $66.3 million and our net loss of $5.1 million, partially offset by positive changes in operating assets and liabilities of $15.6 million. Non-cash items consisted primarily of non-cash amortization of deferred revenue of $79.7 million, partially offset by non-cash stock-based compensation expense of $9.9 million and non-cash interest on our Convertible Notes of $3.3 million. The positive cash flow from changes in operating assets and liabilities of $15.6 million arose in the ordinary course of business.

Net cash provided by investing activities totaled $74.4 million for the six months ended June 30, 2013, consisting of net maturities of short-term investments of $80.1 million, partially offset by $4.6 million of capital expenditures and $1.1 million in letters of credit collateralized by restricted cash to secure operating leases. Net cash used in investing activities totaled $131.6 million for the six months ended June 30, 2012, consisting of net purchases of short-term investments of $124.9 million, $5.8 million of capital expenditures and $0.8 million in letters of credit collateralized by restricted cash to secure operating leases.

Net cash provided by financing activities totaled $3.6 million for the six months ended June 30, 2013 and consisted of proceeds from the issuance of common stock under the Medivation Equity Incentive Plan. Net cash provided by financing activities totaled $261.7 million for the six months ended June 30, 2012, consisting of net proceeds of $251.0 million from the issuance of our Convertible Notes and $11.3 million in proceeds from the issuance of common stock under the Medivation Equity Incentive Plan, partially offset by $0.6 million in issuance costs related to our Convertible Notes.

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Commitments and Contingencies

In June 2013, we entered into the Fourth Amendment to our lease agreement, as amended, at 525 Market Street, San Francisco, California, pursuant to which we leased an additional approximately 13,000 square feet of office space that we expect to occupy beginning in January 2014. In total, at June 30, 2013, we leased approximately 98,000 square feet of office space at 525 Market Street pursuant to the lease agreement, as amended, which expires in June 2019. Additional future lease commitments pursuant to the Fourth Amendment are approximately $4.4 million over the term of the lease agreement.

Except for the future lease commitments resulting from the execution of the Fourth Amendment noted above, our contractual cash obligations, commercial commitments and contingencies have not changed significantly from those disclosed in Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Commitments and Contingencies,” included in our Annual Report. Additional information regarding our commitments and contingencies is included in Notes 5 and 11 to our unaudited consolidated financial statements included elsewhere in this Quarterly Report.

Off-Balance Sheet Arrangements

We currently have no off-balance sheet arrangements as defined in Regulation S-K 303(a)(4)(ii).

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

Market risk is the exposure to loss resulting from changes in interest rates, foreign currency exchange rates, commodity prices and equity prices. Our exposure to market risk has been limited. We currently do not use derivative financial instruments to hedge our market risk exposures. Our cash and investment policy emphasizes liquidity and the preservation of capital over other portfolio considerations. During the six months ended June 30, 2013, there were no material changes to our market risk from those disclosed in Part II, Item 7A, “Quantitative and Qualitative Disclosures About Market Risk,” of our Annual Report.

Interest Rate Risk

Our cash equivalents and short-term investments are exposed to the impact of interest rate changes and our interest income fluctuates as interest rates change. Due to the short-term nature of our investments in money market funds and U.S. Treasury securities, the carrying value of our cash equivalents and short-term investments approximate their fair value at June 30, 2013. Due to the short-term, highly liquid nature of our investments, we do not believe that we are subject to any material market risk exposure related to interest rates.

On March 19, 2012, we completed the sale of $258.8 million aggregate principal amount of the Convertible Notes. The Convertible Notes bear interest at a fixed rate of 2.625% per annum, and as such, we are not exposed to changes in interest rates on the Convertible Notes.

Foreign Currency Exchange Risk

We currently do not have any material exposures to foreign currency exchange rate fluctuations as we operate primarily in the United States. Although we conduct some R&D activities with vendors outside of the United States, most of our transactions are denominated in U.S. dollars. However, certain of our ex-U.S. clinical development activities are pursuant to contracts denominated in foreign currencies. Foreign currency exchange gains and losses for the three and six months ended June 30, 2013 and 2012 were not significant.

Under the Astellas Collaboration Agreement, Astellas records all ex-U.S. XTANDI sales and pays us a tiered royalty ranging from the low teens to the low twenties on ex-U.S. XTANDI sales. The royalties we receive from Astellas on net sales of XTANDI outside of the United States are calculated by converting the respective countries’ XTANDI net sales in local currency to U.S. dollars. The royalties are paid to us in U.S. dollars on a quarterly basis. As a result, fluctuations in the value of the U.S. dollar against foreign currencies will impact our earnings. There were no ex-U.S. XTANDI sales until the second quarter of 2013, and the amount of the ex-U.S. XTANDI sales have not been material to date. Therefore, the financial impact of fluctuations in the value of the U.S. dollar against foreign currencies was not material during the periods presented.

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ITEM 4. CONTROLS AND PROCEDURES.

Evaluation of Disclosure Controls and Procedures

We maintain “disclosure controls and procedures,” as such term is defined in Rule 13a-15(e) under the Exchange Act, that are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the U.S. Securities and Exchange Commission’s rules and forms and that such information is communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure. In designing and evaluating our disclosure controls and procedures, management recognizes that disclosure controls and procedures, no matter how well designed and operated, can provide only reasonable, but not absolute, assurance that the objectives of the disclosure controls and procedures are met. Our disclosure controls and procedures have been designed to meet the reasonable assurance standards. Additionally, in designing disclosure controls and procedures, our management necessarily was required to apply its judgment in evaluating the cost-benefit relationship of possible disclosure controls and procedures. The design of any disclosure controls and procedures is also based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions.

As required by Rule 13a-15(b) or Rule 15d-15(b) of the Exchange Act, we carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered by this Quarterly Report. Based on the foregoing, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of June 30, 2013 at the reasonable assurance level.

Changes in Internal Controls

There were no changes in our internal control over financial reporting during the three months ended June 30, 2013 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS.

In March 2010, the first of several putative securities class action lawsuits was commenced in the U.S. District Court for the Northern District of California, naming as defendants us and certain of our officers. The lawsuits are largely identical and allege violations of the Securities Exchange Act of 1934, as amended. The plaintiffs allege, among other things, that the defendants disseminated false and misleading statements about the effectiveness of dimebon for the treatment of Alzheimer’s disease. The plaintiffs purport to seek damages, an award of their costs and injunctive relief on behalf of a class of stockholders who purchased or otherwise acquired our common stock between September 21, 2006 and March 2, 2010. The actions were consolidated in September 2010 and, in April 2011 the court entered an order appointing Catoosa Fund, L.P. and its attorneys as lead plaintiff and lead counsel. Thereafter, the lead plaintiff filed a consolidated amended complaint, which was dismissed without prejudice as to all defendants in August 2011. The lead plaintiff filed a second amended complaint in November 2011. In March 2012, the court dismissed the second amended complaint with prejudice and entered judgment in favor of defendants. Lead plaintiff filed a notice of appeal to the U.S. Circuit Court of Appeals for the Ninth Circuit in April 2012. The appeal is fully briefed, and we are awaiting notice of the date for oral argument.

In May 2011, we filed a lawsuit in San Francisco Superior Court against the Regents of the University of California, or the Regents, and one of its professors, alleging breach of contract and fraud claims, among others. Our allegations in this lawsuit include that we have exclusive commercial rights to an investigational drug known as ARN-509, which is currently being developed by Aragon Pharmaceuticals, or Aragon. On June 17, 2013, Johnson & Johnson announced it entered into a definitive agreement with Aragon to acquire all ARN-509 assets currently owned by Aragon. ARN-509 is a close structural analog of XTANDI, was developed contemporaneously with XTANDI in the same academic laboratories in which XTANDI was developed, and was purportedly licensed by the Regents to Aragon, a company co-founded by the heads of the academic laboratories in which XTANDI was developed. On February 9, 2012, we filed a Second Amended Complaint, adding as additional defendants a former Regents professor and Aragon. We seek remedies including a declaration that we are the proper licensee of ARN-509, contractual remedies conferring to us exclusive patent license rights regarding ARN-509, and other equitable and monetary relief. On August 7, 2012, the Regents filed a cross-complaint against us seeking declaratory relief which, if granted, would require us to share with the Regents 10% of any sales milestone payments we may receive under the Astellas Collaboration Agreement. Under the Astellas Collaboration Agreement, we are eligible to receive up to $320.0 million in sales milestone payments. On September 18, 2012, the trial court approved a settlement agreement dismissing the former Regents professor who was added to the case on February 9, 2012. On December 20, 2012, and January 25, 2013, the Court

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granted summary judgment motions filed by defendants Regents and Aragon, resulting in dismissal of all claims against Regents and Aragon, but denied such motions filed by the remaining Regents professor. On April 15, 2013, we filed a Notice of Appeal seeking appeal of the judgment in favor of Aragon. We will file a Notice of Appeal of the summary judgment rulings in favor of Regents after the final judgment is entered on the Regent’s cross-complaint. The bench trial of the Regent’s cross-complaint against us was conducted in July 2013, and we are awaiting a decision from the Court. The jury trial of our fraud and breach of contract claims against the remaining Regents professor is scheduled to commence in October 2013.

Our management believes that we have meritorious positions with respect to the claims asserted against us, and we intend to advance our positions in these lawsuits vigorously, including on appeal. However, the lawsuits are subject to inherent uncertainties, the actual costs may be significant, and we may not prevail. We believe we are entitled to coverage under our relevant insurance policies with respect to the putative securities class action lawsuits, subject to a $350,000 retention, but coverage could be denied or prove to be insufficient.

ITEM 1A. RISK FACTORS.

Our business faces significant risks, some of which are set forth below to enable readers to assess, and be appropriately apprised of, many of the risks and uncertainties applicable to the forward-looking statements made in this Quarterly Report. You should carefully consider these risk factors as each of these risks could adversely affect our business, operating results, cash flows and financial condition. If any of the events or circumstances described in the following risks actually occurs, our business may suffer, the trading price of our common stock and our 2.625% convertible senior notes due April 1, 2017, or the Convertible Notes, could decline and our financial condition or results of operations could be harmed. Given these risks and uncertainties, you are cautioned not to place undue reliance on forward-looking statements. These risks should be read in conjunction with the other information set forth in this Quarterly Report. The risks and uncertainties described below are not the only ones we face. Additional risks and uncertainties not presently known to us, or that we currently believe to be immaterial, may also adversely affect our business.

Risks facing our business have not changed substantively from those discussed in our Annual Report on Form 10-K for the year ended December 31, 2012, except for those risk factors below designated by an asterisk (*).

Risks Related to XTANDI ^® (enzalutamide) capsules

*XTANDI ^® (enzalutamide) capsules, our only approved product, is only approved for sale in the United States, the European Union, Canada, and South Korea to treat patients with metastatic castration-resistant prostate cancer, or mCRPC, who have previously received docetaxel-based chemotherapy, which we refer to as “post-chemotherapy mCRPC patients.” Our prospects are largely dependent on (a) successful commercialization of XTANDI in the United States to treat post-chemotherapy mCRPC patients, (b) obtaining additional regulatory approval of, and successfully commercializing, XTANDI outside the United States to treat post-chemotherapy mCRPC patients, and (c) obtaining regulatory approval of, and successfully commercializing, XTANDI both in and outside the United States to treat patients in other indications, such as in patients with mCRPC who have not yet received docetaxel, which we refer to as “pre-chemotherapy mCRPC patients.” If we are unsuccessful in achieving any one or more of these critical business objectives, our ability to generate significant revenue or achieve or maintain profitability would be adversely affected and our business may be harmed or fail. XTANDI is our only approved product. On August 31, 2012, we obtained approval from the United States Food and Drug Administration, or FDA, to market XTANDI to treat post-chemotherapy mCRPC patients. On June 24, 2013, after the regulatory review process by the European Medicines Agency (EMA) and a positive opinion from the Committee for Medicinal Products for Human Use on April 25, 2013, the European Commission (EC) granted marketing authorization for XTANDI for the treatment of adult men with mCRPC whose disease has progressed on or after docetaxel therapy. XTANDI was approved for use in post-chemotherapy mCRPC patients in Canada and South Korea on June 3 and June 26, 2013, respectively. Unless we and our collaboration partner, Astellas Pharma, Inc., or Astellas, can obtain additional regulatory approval of, and successfully commercialize, XTANDI to treat other patient populations within the United States, or additional patient populations outside the United States, our ability to generate revenue from XTANDI and fund our operations could be significantly limited.

Our ongoing Phase 3 PREVAIL trial is designed to generate data supporting global regulatory applications for XTANDI to treat pre-chemotherapy mCRPC patients. We do not yet know whether the results of the PREVAIL trial will be positive or whether those results, even if positive, will be sufficiently robust with an acceptable risk to benefit profile to obtain regulatory approvals for XTANDI in the United States or anywhere else in the world to treat pre-chemotherapy mCRPC patients. The planned interim analysis for the PREVAIL trial is expected to occur in 2013. We believe that the commercial opportunity represented by pre-chemotherapy mCRPC patients is substantially larger than that represented by post-chemotherapy mCRPC patients, and thus that any failure to successfully obtain approval and commercialize XTANDI for the treatment of pre-chemotherapy mCRPC patients would have a particularly negative impact on our business and future prospects.

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The commercialization of XTANDI for the treatment of post-chemotherapy mCRPC patients, pre-chemotherapy mCRPC patients (should it be approved for that population), or any other patient populations for which XTANDI may subsequently be approved may not be successful for a number of reasons, including:

• we and our collaboration partner, Astellas, may not be able to establish or demonstrate in the medical community the safety and efficacy of XTANDI and its potential advantages over, and side effects compared to, competing therapeutics and products currently in clinical development for each applicable patient population;

• our limited experience in marketing XTANDI for any patient population;

• reimbursement and coverage policies of government and private payors such as Medicare, Medicaid, insurance companies, health maintenance organizations and other plan administrators;

• the relative price of XTANDI as compared to alternative treatment options;

• changes or increases in regulatory restrictions;

• changes to the label for XTANDI that further restrict how we and Astellas market XTANDI, including as a result of data collected from the safety study in patients with known risk factor(s) for seizure that the FDA required us to undertake as a post-marketing requirement or from any other ongoing or future studies;

• we and Astellas may not have adequate financial or other resources to successfully commercialize XTANDI; and

• we and Astellas may not be able to obtain adequate commercial supplies of XTANDI to meet demand or at an acceptable cost.

If the commercialization of XTANDI is unsuccessful, our ability to generate revenue from product sales and achieve profitability would be adversely affected and our business could fail.

XTANDI may not gain market acceptance and may fail to generate significant revenue. The commercial success of XTANDI will depend upon its acceptance by the medical community, patients and third-party payors as clinically useful, cost-effective and safe. The degree of market acceptance of any drug depends on a number of factors, such as:

• its demonstration of efficacy and safety in clinical trials;

• its superior efficacy as compared to alternate treatments and its side effect profile;

• its cost effectiveness and the availability of insurance or other third-party reimbursement;

• its convenience and ease of administration;

• the timing of its market entry relative to competing treatments;

• the extent and success of marketing and sales efforts; and

• the product labeling or package insert required by the FDA or foreign regulatory authorities.

Failure to attain market acceptance among the medical community, patients or third-party payors may have adverse impact on our operations and profitability. Although certain of our employees have commercialization experience, as a company we currently have only limited commercial capabilities. We may not be able to attract and retain qualified personnel to serve in our sales and marketing organization to effectively support our commercialization activities. If we are not successful in commercializing XTANDI, our future product revenue will suffer and we may incur significant losses.

*XTANDI faces significant competition from other approved products and other products in development. The biopharmaceutical industry is intensely competitive in general. Furthermore, our business strategy is to target large unmet medical needs, and those markets are even more highly competitive. Companies are currently marketing, or expected to be marketing in the near future, products that compete directly with XTANDI, including some of the world’s largest and most experienced pharmaceutical companies, such as Johnson & Johnson and Sanofi, which have considerably more financial, development and commercialization resources and experience than we have to develop their products. For example, in June 2013, Johnson & Johnson and Aragon Pharmaceuticals, or Aragon, announced that they had entered into a definitive agreement pursuant to which Johnson & Johnson will acquire all ARN-509 assets currently owned by Aragon. Aragon is currently developing an investigational drug known as ARN-509, a close structural analog of XTANDI, and we are in current litigation with Aragon over rights to ARN-509. See Part II, Item 1. “Legal Proceedings.” There are also multiple additional small molecule and recombinant protein candidates in development targeting castration-resistant prostate cancer, or CRPC, including compounds already in Phase 3 clinical trials. Products and compounds are also being developed to compete with XTANDI in upstream populations for which we, and our partner Astellas, are or are considering developing XTANDI. We are competing, and expect to continue to compete, against multiple drugs that currently exist, as well as additional drugs currently in development, to treat post-chemotherapy mCRPC and pre-chemotherapy mCRPC. Competitive drugs already have acquired

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substantial shares in these markets, which may make it more difficult for us to compete successfully in these markets notwithstanding any positive results that we may generate from our clinical trials. In addition, we are competing and will continue to compete against multiple drugs currently being developed to treat pre-chemotherapy mCRPC and earlier prostate cancer disease states, as well as drugs that operate similarly to XTANDI. To the extent XTANDI is used after drugs like Zytiga and/or potentially ARN-509, which operate on the same molecular signaling pathway or have the same mechanism of action as XTANDI, patients generally will not have as good a response on XTANDI, as would patients who are naïve of such drugs. If XTANDI is unable to successfully compete for a position in the prostate cancer treatment paradigm ahead of drugs like Zytiga and/or potentially ARN-509, sales of XTANDI would be negatively impacted, due to shorter than expected duration of XTANDI therapy. Bases upon which XTANDI would have to compete successfully include efficacy, safety, price and cost-effectiveness. We cannot guarantee that we, Astellas or any of our potential future partners will be able to compete successfully in the context of any of these factors. Any future product candidates that we may subsequently acquire will face similar competitive pressures. If we or our partners cannot compete successfully on any of the bases described above, our business will not succeed.

*XTANDI may not be commercially successful if not widely-covered and appropriately reimbursed by third-party payors, and we are dependent upon Astellas for the execution of third-party payor access and reimbursement strategies for XTANDI. Third-party payors, including public insurers such as Medicare and Medicaid and private insurers, pay for a large share of health care products and services consumed in the United States. In Europe, Canada and other major international markets, third-party payors also pay for a significant portion of health care products and services and many of those countries have nationalized health care systems in which the government pays for all such products and services and must approve product pricing. Our ability to successfully commercialize XTANDI for its approved indication depends, in part, on the extent to which coverage and reimbursement for XTANDI is available from government and health administration authorities, private health insurers, managed care programs and other third-party payors. Significant uncertainty exists as to the coverage and reimbursement of newly approved prescription drug products.

In addition, even if third-party payors ultimately elect to cover and reimburse for XTANDI, most payors will not reimburse 100% of the cost, but rather require patients to pay a portion of the cost through a co-payment. Thus, even if reimbursement is available, the percentage of drug cost required to be borne by the patients may make use of XTANDI financially difficult or impossible for certain patients, which would have a negative impact on sales of XTANDI. For example, in the United States there exists a coverage gap, or “donut hole”, in the Medicare Part D coverage for prescription medications for participants, which renews annually each January 1^st. While in the donut hole Medicare Part D participants, which include many patients in XTANDI’s approved indication, may have to pay out of pocket a substantial portion of their prescription drug costs, which may discourage physicians from prescribing or patients for accessing XTANDI. It is increasingly difficult to obtain coverage and adequate reimbursement levels from third-party payors, and we may be unable to achieve these objectives. Moreover, our commercial prospects would be further weakened if payors approved coverage for XTANDI only as second- or later-line treatments, or if they placed XTANDI in tiers requiring unacceptably high patient co-payments. Since launch, several third-party payors have approved coverage for XTANDI only after patient treatment on Zytiga plus prednisone. Because XTANDI works via the same molecular signaling pathway as Zytiga does, patients who have already been treated with Zytiga generally will not have as good a response on XTANDI as would patients who are Zytiga-naïve. Failure to overturn these coverage decisions or stop additional such coverage decisions could materially harm our or our partner’s ability to successfully market XTANDI. Achieving coverage and acceptable reimbursement levels typically involves negotiating with individual payors and is a time-consuming and costly process. We are dependent upon Astellas for the achievement of such coverage and acceptable reimbursement, and negotiation with individual payors.

Moreover, in March 2010, the President of the United States signed the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Affordability Reconciliation Act, collectively, PPACA, which substantially changes the way health care is financed by both governmental and private insurers, and significantly impacts the pharmaceutical industry. The provisions of PPACA most relevant to the pharmaceutical industry include the following:

• an annual, nondeductible fee on any entity that manufactures or imports certain branded prescription drugs and biologic agents, apportioned among these entities according to their market share in certain government healthcare programs, not including orphan drug sales;

• an increase in the rebates a manufacturer must pay under the Medicaid Drug Rebate Program to 23.1% and 13% of the average manufacturer price for branded and generic drugs, respectively;

• a new Medicare Part D coverage gap discount program, in which manufacturers must agree to offer 50% point-of-sale discounts to negotiated prices of applicable brand drugs to eligible beneficiaries during their coverage gap period, as a condition for the manufacturer’s outpatient drugs to be covered under Medicare Part D;

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• extension of manufacturers’ Medicaid rebate liability to covered drugs dispensed to individuals who are enrolled in Medicaid managed care organizations;

• expansion of eligibility criteria for Medicaid programs by, among other things, allowing states to offer Medicaid coverage to additional individuals and by adding new mandatory eligibility categories for certain individuals with income at or below 133% of the Federal Poverty Level beginning in 2014, thereby potentially increasing manufacturers’ Medicaid rebate liability;

• expansion of the entities eligible for discounts under the Public Health Service pharmaceutical pricing program;

• new requirements to report certain financial arrangements with physicians and teaching hospitals, as defined in PPACA and its implementing regulations, including reporting any payment or “transfer of value” made or distributed to prescribers and teaching hospitals, and reporting any ownership and investment interests held by physicians and their immediate family members and applicable group purchasing organizations during the preceding calendar year, with data collection to be required beginning on August 1, 2013, annual reporting beginning on March 31, 2014, and publication by CMS on a searchable website beginning September 30, 2014;

• expansion of health care fraud and abuse laws, including the False Claims Act and the Anti-Kickback Statute, new government investigative powers, and enhanced penalties for noncompliance;

• a licensure framework for follow-on biologic products; and

• a new Patient-Centered Outcomes Research Institute to oversee, identify priorities in, and conduct comparative clinical effectiveness research, along with funding for such research.

On June 28, 2012, the United States Supreme Court upheld the constitutionality of PPACA, excepting certain provisions, noted above, that would have required states to expand their Medicaid programs or risk losing all of the state’s Medicaid funding. At this time, it remains unclear whether there will be any further changes made to PPACA, whether in part or in its entirety. Moreover, other state and federal legislative and regulatory proposals aimed at reforming the health care system in the United States are periodically proposed, the effect of which, if enacted, could adversely impact our product sales and results of operations.

Moreover, on August 2, 2011, the Budget Control Act of 2011 created, among other things, the Joint Select Committee on Deficit Reduction, to recommend to Congress proposals in spending reductions. The Joint Select Committee did not achieve a targeted deficit reduction of at least $1.2 trillion for the years 2013 through 2021, which triggered the legislation’s automatic reduction to several government programs. This includes aggregate reductions to Medicare payments to providers of up to 2% per fiscal year, beginning on March 1, in 2013. Further, President Obama’s proposed budget for 2013 and certain proposed legislation, if enacted, would require drug manufacturers to pay to the Medicare program new rebates for certain outpatient drugs covered under Medicare Part D. These proposals would allow the Medicare program to benefit from the same, relatively higher, rebates that Medicaid receives for brand name and generic drugs provided to beneficiaries who receive the low-income subsidies under the Medicare Part D program and “dual eligible” beneficiaries (i.e., those who are eligible for both the Medicare and Medicaid programs.)

We expect that there will continue to be a number of federal and state proposals to implement spending reductions in government healthcare programs, e.g., Medicare or government controls over drug product pricing. We are currently unable to predict what additional legislation or regulations, if any, relating to the pharmaceutical industry or third-party payor coverage and reimbursement may be enacted in the future, or what effect PPACA or any such additional legislation or regulation will or would have on our business. However, spending reductions in government healthcare programs or additional government controls over drug product pricing would likely negatively impact our business. In addition, we would face competition in such negotiations from other approved drugs against which we compete, which may include other approved drugs marketed by Astellas, and the marketers of such other drugs are likely to be significantly larger than us and therefore enjoy significantly more negotiating leverage with respect to the individual payors than we may have.

We are dependent on Astellas and its contract manufacturers to manufacture clinical and commercial requirements of XTANDI, and we are dependent on Astellas and a limited number of specialty pharmaceutical wholesalers and distributors in Astellas’ network to commercialize and distribute XTANDI, which could impact the sales of XTANDI. Under our collaboration agreement with Astellas, Astellas has the primary right and responsibility to manufacture and/or manage the supply of XTANDI for clinical trials and all commercial requirements. Astellas intends to fulfill these obligations largely through third-party contract manufacturers. Consequently, we are, and expect to remain, dependent on Astellas and its contract manufacturers to supply XTANDI. Astellas and its contract manufacturers may encounter difficulties in production scale-up, including problems involving production yields, quality control and quality assurance, and shortage of qualified personnel. Astellas and its contract manufacturers may not perform as agreed or may default in their obligations to supply clinical trial supplies and/or

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commercial product. Astellas and its contract manufacturers may fail to deliver the required quantities of XTANDI on a timely basis. Any such failure by Astellas or its contract manufacturers could delay our future clinical trials or could impair our ability to meet the market demand for XTANDI and therefore result in decreased sales. If Astellas or its contract manufacturers do not adequately perform, we may be forced to incur additional expenses, delays, or both, to arrange or take responsibility for contract manufacturers to manufacture XTANDI on our behalf, as we do not have any internal manufacturing capabilities.

Under our collaboration agreement with Astellas, we and Astellas have the right to jointly promote XTANDI to customers in the United States. However, Astellas has the sole right to distribute and sell XTANDI to customers in the United States and the sole right to promote, distribute and sell XTANDI to customers outside the United States. We are thus partially dependent on Astellas to successfully promote XTANDI in the United States, and solely dependent on Astellas to successfully distribute and sell XTANDI in the United States and to promote, distribute and sell XTANDI outside of the United States. Although certain of our employees have commercialization experience, as a company, we currently have only limited commercial capabilities. We also have to compete with other pharmaceutical and life sciences companies to recruit, hire, train and retain sales and marketing personnel, and turnover in our sales force and marketing personnel could negatively affect sales of XTANDI. We currently depend on customer support from specialty pharmaceutical distributors and wholesalers in Astellas’ network. Astellas has contracted with a limited number of specialty pharmaceutical distributors and wholesalers to deliver XTANDI to end users. The use of specialty pharmacies and wholesalers requires significant coordination with Astellas’ sales and marketing, medical affairs, regulatory affairs, legal and financial organizations and involves risks, including but not limited to risks that these specialty pharmacies and wholesalers will:

• not provide Astellas accurate or timely information regarding their inventories, patient- or account- level data or safety complaints regarding XTANDI;

• not effectively sell or support XTANDI;

• not devote the resources necessary to sell XTANDI in the volumes and within the timeframes that we expect; or

• cease operations.

We generally do not have control over the resource or degree of effort that any of the specialty pharmacies and distributors may devote to XTANDI, and if their performance is substandard, this will adversely affect sales of XTANDI. If Astellas’ network of specialty pharmacies and distributors fails to adequately perform, it could negatively impact sales of XTANDI, which would negatively impact our business, results of our operations, cash flows and liquidity.

*Medivation and Astellas are required to conduct post-marketing requirements or commitments in the European Union and the United States. In the EU, we and Astellas are required to collect efficacy data on mCRPC patients previously treated with Zytiga (abiraterone acetate) to determine XTANDI efficacy response in such patients, which may not be as good as in patients naïve to Zytiga. In the United States, we and Astellas are required to conduct an open-label safety study of XTANDI in patients with known risk factor(s) for seizure and to report the results of that study to the FDA in 2019. If the results of this study reveal unacceptable safety risks, this could result in decreased commercial utilization of XTANDI for post-chemotherapy mCRPC, failure to obtain approval in other indications (including pre-chemotherapy mCRPC and breast cancer), and modifications to the existing label for post-chemotherapy mCRPC, including potentially a boxed warning. As part of the approval for XTANDI for the treatment of post-chemotherapy mCRPC patients in the EU and the U.S., regulatory authorities have required us and Astellas to perform post-marketing requirements or commitments. For the EU requirement, the final submission report is due to regulatory authorities by December 2016, and for the U.S. commitment, the results of the safety study are due to the FDA in 2019. Failure to conduct the post-marketing requirements or commitments in a timely manner may result in substantial civil and/or criminal penalties. If the results of the open-label safety study of XTANDI in patients with known risk factor(s) for seizure reveal unacceptable safety risks, we could be required by the FDA to perform additional tests or to modify the labeled indication for which XTANDI has already been approved to include additional restrictions, and /or to include a boxed warning, any one or more of which would seriously harm our business.

*Because our ongoing Phase 3 PREVAIL trial of XTANDI in pre-chemotherapy mCRPC patients has overall survival as a primary endpoint, the availability of approved and/or experimental agents that prolong survival, including the approved hormonal agent Zytiga (abiraterone acetate), the approved chemotherapy agents docetaxel and Jevtana (cabazitaxel), the approved prostate cancer vaccine Provenge (sipuleucel-T), and the recently approved Xofigo (radium RA 223 dichloride injection), as well as the commercial availability of XTANDI, may make it more difficult for our PREVAIL trial to succeed or may prevent it from succeeding, and could reduce the magnitude of any potential survival benefit that enzalutamide may demonstrate in PREVAIL even if that trial does succeed. Our ongoing Phase 3 PREVAIL trial in pre-chemotherapy mCRPC is attempting to demonstrate a statistically significant difference in survival between drug-treated and placebo-treated patients. Overall survival and progression-free survival are the co-primary endpoints in our ongoing PREVAIL trial. Patients participating in our PREVAIL trial may elect to stop study drug and switch to alternative treatments that are, or may in the

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future become, available to them commercially, such as Zytiga (abiraterone acetate), docetaxel, Jevtana (cabazitaxel) Provenge (sipuleucel-T), or Xofigo (radium RA 223 dichloride injection). Each of these alternative treatments has demonstrated statistically significant survival benefits of between two and one-half and five months vs. placebo in mCRPC patients and is commercially available. The survival of any PREVAIL patients who take an alternative treatment will continue to be included in the analysis of the trial. Any survival benefit conferred by these alternative treatments on the one-half of all patients in our PREVAIL trial who were randomized to placebo may have a negative impact on the results of our PREVAIL trial. Patients in our PREVAIL trial are free to stop study drug at any time, and are free to take any alternative treatment once they have stopped study drug. We have no ability to control or influence either of these decisions. Use of life-prolonging treatments by patients leaving our PREVAIL trial could make it more difficult for the trial to succeed, could prevent it from succeeding, and could reduce any potential survival benefit that may be demonstrated even if it does succeed. Failure of our PREVAIL trial could have significant negative effects on us, including preventing us from obtaining marketing approval in pre-chemotherapy mCRPC, which is a far larger commercial opportunity than post-chemotherapy mCRPC, being required to conduct additional trials, or causing our partner Astellas to elect to terminate our collaboration agreement. Even if our PREVAIL trial succeeds, any negative impact on the survival benefit shown in that trial could reduce or eliminate XTANDI’s ability to compete effectively with other treatments that have shown longer survival benefits.

Positive results from our AFFIRM trial in post-chemotherapy mCRPC may not be predictive of results of our PREVAIL trial in pre-chemotherapy mCRPC or any of our other ongoing and potential future clinical trials of enzalutamide. Product candidates in clinical trials, including Phase 3 clinical trials, often fail to show the desired safety and efficacy outcomes despite having progressed successfully through prior stages of preclinical and clinical testing. Even where we achieve positive results in clinical trials, subsequent clinical trials may fail, even if those subsequent trials are designed very similarly to their predecessors. Accordingly, despite the positive results from our Phase 3 AFFIRM trial of XTANDI in post-chemotherapy mCRPC, our ongoing Phase 3 PREVAIL trial in pre-chemotherapy mCRPC and any other of our ongoing or planned studies of enzalutamide may fail.

We are dependent upon our collaborative relationship with Astellas to further develop, manufacture and commercialize XTANDI. There may be circumstances that delay or prevent Astellas’ ability to further develop, manufacture and commercialize XTANDI or that result in Astellas terminating our agreement with them. Under our collaboration agreement with Astellas, Astellas is responsible for developing, seeking regulatory approval for, and commercializing XTANDI outside the United States and is responsible globally for all manufacture of product for both clinical and commercial purposes. We and Astellas are jointly responsible for commercializing XTANDI in the United States. We and Astellas share equally the costs (subject to certain exceptions), profits and losses arising from development and commercialization of XTANDI in the United States. For clinical trials useful both in the United States and in Europe or Japan, we are responsible for one-third of the total costs and Astellas is responsible for the remaining two-thirds. We are subject to a number of risks associated with our dependence on our collaborative relationship with Astellas, including:

• Astellas’ right to terminate the collaboration agreement with us on limited notice for convenience (subject to certain limitations), or for other reasons specified in the collaboration agreement;

• the need for us to identify and secure on commercially reasonable terms the services of third parties to perform key activities currently performed by Astellas in the event that Astellas were to terminate its collaboration with us, including development and commercialization activities outside of the United States and manufacturing activities globally;

• adverse decisions by Astellas regarding the amount and timing of resource expenditures for the commercialization of XTANDI;

• decisions by Astellas to prioritize other of its present or future products more highly than XTANDI for either development and/or commercial purposes;

• possible disagreements with Astellas as to the timing, nature and extent of our development plans, including clinical trials or regulatory approval strategy;

• changes in key management personnel that are members of the collaboration’s various committees; and

• possible disagreements with Astellas, including those regarding the development and/or commercialization of products, interpretation of the collaboration agreement and ownership of proprietary rights.

Due to these factors and other possible disagreements with Astellas, we may be delayed or prevented from further developing, manufacturing or commercializing XTANDI or we may become involved in litigation or arbitration, which would be time consuming and expensive.

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If Astellas were to unilaterally terminate our collaborative relationship, we would need to undertake manufacturing and marketing activities for XTANDI solely at our own expense and/or seek one or more other partners for some or all of these activities, worldwide. If we pursued these activities on our own, it would significantly increase our capital and infrastructure requirements, might limit the indications we are able to pursue for XTANDI, and could prevent us from effectively commercializing XTANDI. If we sought to find one or more other pharmaceutical company partners for some or all of these activities, we may not be successful in such efforts, or they may result in collaborations that have us expending greater funds and efforts than our current relationship with Astellas.

We are dependent on the efforts of, and funding by, Astellas for the further development of XTANDI. Under the terms of our collaboration agreement with Astellas, we and Astellas must agree on any changes to the development plan for XTANDI that is set forth in the agreement. If we and Astellas cannot agree on any such changes, clinical trial progress could be significantly delayed or halted. Subject to certain limitations set forth in our collaboration agreement with Astellas, Astellas is generally free to terminate the agreement at its discretion on limited notice to us. Similarly, in the event of an uncured material breach of the agreement by us, Astellas may elect to terminate the agreement, in which case all rights to develop and commercialize XTANDI will revert to us. If Astellas terminates its co-funding of our XTANDI program, we may be unable to fund the development and commercialization costs on our own and may be unable to find another partner, which could force us to raise additional capital or could cause our XTANDI program to fail. In addition, Astellas is solely responsible for the development and regulatory approval of XTANDI outside the United States, so we are entirely dependent on Astellas for the successful completion of those activities.

The financial returns to us, if any, under our collaboration agreement with Astellas, depend in large part on the achievement of development and commercialization milestones and the generation of product sales. Therefore, our success, and any associated financial returns to us and our investors, will depend in large part on the performance of Astellas under the Collaboration Agreement. If Astellas fails to perform or satisfy its obligations to us, the development or commercialization of XTANDI would be delayed or may not occur and our business and prospects could be materially and adversely affected for that reason.

If Astellas’ business strategies change, any such changes may adversely affect our collaborative relationship with Astellas. Astellas may change its business strategy. Decisions by Astellas to either reduce or eliminate its participation in the prostate cancer field, to emphasize other competitive agents currently in its portfolio at the expense of XTANDI, or to add additional competitive agents to its portfolio could reduce its financial incentives to continue to develop or commercialize XTANDI. For example, Astellas has partnered with us based in part on Astellas’ desire to use XTANDI as a component of building a global oncology franchise, which Astellas presently does not have. If Astellas’ strategic objective of building a global oncology franchise were to change, such change could negatively impact any commercial prospects of XTANDI.

Risks Related to Our Future Product Development Candidates

Our business strategy depends on our ability to identify and acquire additional product candidates which we may never acquire or identify for reasons that may not be in our control, or are otherwise unforeseen or unforeseeable to us. A key component of our business strategy is to diversify our product development risk by identifying and acquiring new product opportunities for development. However, we may not be able to identify promising new technologies. In addition, the competition to acquire promising biomedical technologies is fierce, and many of our competitors are large, multinational pharmaceutical, biotechnology and medical device companies with considerably more financial, development and commercialization resources and experience than we have. Thus, even if we succeed in identifying promising technologies, we may not be able to acquire rights to them on acceptable terms or at all. If we are unable to identify and acquire new technologies, we will be unable to diversify our product risk. We believe that any such failure would have a significant negative impact on our prospects because the risk of failure of any particular development program in the pharmaceutical industry is high.

Because we depend on our management to oversee the execution of commercialization plans for XTANDI and continued development activities for enzalutamide, and to identify and acquire promising new product candidates, the loss of any of our executive officers would harm our business. Our future success depends upon the continued services of our executive officers. We are particularly dependent on the continued services of David Hung, M.D., our president and chief executive officer and a member of our board of directors. Dr. Hung identified enzalutamide for acquisition and has primary responsibility for identifying and evaluating other potential product candidates. We believe that Dr. Hung’s services in this capacity would be difficult to replace. None of our executive officers is bound by an employment agreement for any specific term, and they may terminate their employment at any time. In addition, we do not have “key person” life insurance policies covering any of our executive officers. The loss of the services of any of our executive officers could delay the commercialization of XTANDI and continued development activities for enzalutamide and delay or preclude the identification and acquisition of new product candidates, either of which events could harm our business.

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Pharmaceutical product candidates require extensive, time-consuming and expensive preclinical and clinical testing to establish safety and efficacy. We may never attract additional partners for our technologies or receive marketing approval in any jurisdiction. The research and development of pharmaceuticals is an extremely risky industry. Only a small percentage of product candidates that enter the development process ever receive marketing approval. The process of conducting the preclinical and clinical testing required to establish safety and efficacy and obtain marketing approval is expensive and uncertain and takes many years. If we are unable to complete preclinical or clinical trials of current or future product candidates, or if the results of these trials are not satisfactory to convince regulatory authorities or partners of their safety or efficacy, we will not be able to obtain marketing approval or attract additional partners for those product candidates. Furthermore, even if we or our partners are able to obtain marketing approvals for any of our product candidates, those approvals may be for indications that are not as broad as desired or may contain other limitations that would adversely affect our ability to generate revenue from sales of those products. If this occurs, our business would be materially harmed and our ability to generate revenue would be severely impaired.

Enrollment and retention of patients in clinical trials is an expensive and time-consuming process, could be made more difficult or rendered impossible by multiple factors outside our control, including the availability of competing treatments or clinical trials of competing drugs for the same indication and the results of other studies of our product candidates in the same or other indications, and could result in significant delays, cost overruns, or both, in our product development activities, or in the failure of such activities. We may encounter delays in enrolling, or be unable to enroll, a sufficient number of patients to complete any of our clinical trials, and even once enrolled we may be unable to retain a sufficient number of patients to complete any of our trials. Patient enrollment and retention in clinical trials depends on many factors, including the size of the patient population, the nature of the trial protocol, the existing body of safety and efficacy data with respect to the study drug, the number and nature of competing treatments and ongoing clinical trials of competing drugs for the same indication, the proximity of patients to clinical sites and the eligibility criteria for the study. Furthermore, any negative results we may report in clinical trials of enzalutamide or any potential future product candidates may make it difficult or impossible to recruit and retain patients in other clinical studies of that same product candidate. Delays or failures in planned patient enrollment and/or retention may result in increased costs, program delays or both, which could have a harmful effect on our ability to develop enzalutamide or any product candidates, or could render further development impossible.

Our reliance on third parties for the operation of our business may result in material delays, cost overruns and/or quality deficiencies in our development programs. We rely on outside vendors to perform key product development tasks, such as conducting preclinical and clinical studies and manufacturing our product candidates at appropriate scale for preclinical and clinical trials and, in situations where we are unable to transfer those responsibilities to a corporate partner, for commercial use as well. To manage our business successfully, we will need to identify, engage and properly manage qualified external vendors that will perform these development activities. For example, we need to monitor the activities of our vendors closely to ensure that they are performing their tasks correctly, on time, on budget and in compliance with strictly enforced regulatory standards. Our ability to identify and retain key vendors with the requisite knowledge is critical to our business and the failure to do so could negatively impact our business. Because all of our key vendors perform services for other clients in addition to us, we also need to ensure that they are appropriately prioritizing our projects. If we fail to manage our key vendors well, we could incur material delays, cost overruns or quality deficiencies in our development and commercialization programs, as well as other material disruptions to our business.

Risks Related to the Pharmaceutical Industry, Including the Activities of Medivation, Inc.

Our industry is highly regulated by the FDA and comparable foreign regulatory agencies. We must comply with extensive, strictly enforced regulatory requirements to develop and obtain marketing approval for any of our product candidates. Before we, Astellas or any potential future partners can obtain regulatory approval for the sale of our product candidates, our product candidates must be subjected to extensive preclinical and clinical testing to demonstrate their safety and efficacy for humans.

The preclinical and clinical trials of any product candidates that we develop must comply with regulation by numerous federal, state and local government authorities in the United States, principally the FDA, and by similar agencies in other countries. We are required to obtain and maintain an effective investigational new drug application to commence human clinical trials in the United States and must obtain and maintain additional regulatory approvals before proceeding to successive phases of our clinical trials. Securing FDA approval requires the submission of extensive preclinical and clinical data and supporting information for each therapeutic indication to establish the product candidate’s safety and efficacy for its intended use. It takes years to complete the testing of a new drug or medical device and development delays and/or failure can occur at any stage of testing. Any of our present and future clinical trials may be delayed, halted or approval of any of our products may be delayed or may not be obtained due to any of the following:

• any preclinical test or clinical trial may fail to produce safety and efficacy results satisfactory to the FDA or foreign regulatory authorities;

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• preclinical and clinical data can be interpreted in different ways, which could delay, limit or prevent regulatory approval;

• negative or inconclusive results from a preclinical test or clinical trial or adverse medical events during a clinical trial could cause a preclinical study or clinical trial to be repeated or a program to be terminated, even if other studies or trials relating to the program are ongoing or have been completed and were successful;

• the FDA or foreign regulatory authorities can place a clinical hold on a trial if, among other reasons, it finds that patients enrolled in the trial are or would be exposed to an unreasonable and significant risk of illness or injury;

• the FDA might not approve the clinical processes or facilities that we utilize, or the processes or facilities of our consultants, including without limitation the vendors who will be manufacturing drug substance and drug product for us or any potential collaborators; and

• we may encounter delays or rejections based on changes in FDA policies or the policies of foreign regulatory authorities during the period in which we develop a product candidate or the period required for review of any final regulatory approval before we are able to market any product candidate.

In addition, information generated during the clinical trial process is susceptible to varying interpretations that could delay, limit, or prevent regulatory approval at any stage of the approval process. Moreover, early positive preclinical or clinical trial results may not be replicated in later clinical trials. Failure to demonstrate adequately the quality, safety and efficacy of any of our product candidates would delay or prevent regulatory approval of the applicable product candidate. There can be no assurance that if clinical trials are completed, either we or our collaborative partners will submit applications for required authorizations to manufacture or market potential products or that any such application will be reviewed and approved by appropriate regulatory authorities in a timely manner, if at all. Moreover, any regulatory approval we, Astellas or any potential future collaborators ultimately obtain may be limited or subject to restrictions or post-approval commitments that render the product not commercially viable.

If XTANDI or any potential future product candidates cannot be manufactured in a cost-effective manner and in compliance with current good manufacturing practices, or cGMP, and other applicable regulatory standards, they will not be commercially successful. All pharmaceutical and medical device products in the United States, Europe and other countries must be manufactured in strict compliance with cGMP and other applicable regulatory standards. Establishing a cGMP-compliant process to manufacture pharmaceutical products involves significant time, cost and uncertainty. Furthermore, to be commercially viable, any such process would have to yield product on a cost-effective basis, using raw materials that are commercially available on acceptable terms. We face the risk that our contract manufacturers may have interruptions in raw material supplies, be unable to comply with strictly enforced regulatory requirements, or, for other reasons beyond their or our control, be unable to complete their manufacturing responsibilities on time, on budget, or at all. Under our Collaboration Agreement with Astellas, Astellas is responsible for all manufacture of XTANDI for commercial purposes, but we cannot guarantee that Astellas will be able to supply XTANDI in a timely manner or at all, or that continued commercial-scale cGMP manufacture of XTANDI using a validated manufacturing process will be possible on a cost-effective basis, which would materially and adversely affect the value of our XTANDI program.

We are subject to certain healthcare laws, regulation and enforcement that may impact the commercialization of XTANDI and our product candidates. Failure to comply with such laws, regulations and enforcement could subject us to significant fines and penalties and result in a material adverse effect on our results of operations and financial conditions. We are subject to several healthcare regulations and enforcement by the federal government and the states in which we conduct our business. These laws may impact, among other things, the sales, marketing and education programs for XTANDI or any of our potential future product candidates that may be approved for commercial sale:

• the federal Health Insurance Portability and Accountability Act of 1996, as amended by the Health Information Technology for Economic and Clinical Health Act (collectively, “HIPAA”), as amended by the Health Information for Economic and Clinical Health Act of 2009 (“HITECH”) which governs the conduct of certain electronic healthcare transactions and protects the security and privacy of protected health information;

• the federal healthcare programs’ Anti-Kickback Law, which prohibits, among other things, persons from knowingly and willfully soliciting, receiving, offering or paying remuneration, directly or indirectly, in exchange for or to induce either the referral of an individual for, or the purchase, order or recommendation of, any good or service for which payment may be made under federal healthcare programs such as the Medicare and Medicaid programs;

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• federal false claims laws which prohibit, among other things, individuals or entities from knowingly presenting, or causing to be presented, claims for payment from Medicare, Medicaid, or other third-party payors that are false or fraudulent;

• the Federal Food, Drug, and Cosmetic Act, which, among other things, strictly regulates drug product marketing, prohibits manufacturers from marketing drug products for off-label use, and regulates the distribution of drug samples;

• federal criminal laws that prohibit executing a scheme to defraud any healthcare benefit program or making false statements relating to healthcare matters; and

• state law equivalents of each of the above federal laws, such as anti-kickback and false claims laws which may apply to items or services reimbursed by any third-party payor, including commercial insurers.

Additionally, the compliance environment is changing, with more states, such as California and Massachusetts, mandating implementation of compliance programs, compliance with industry ethics codes, and spending limits, and other states, such as Vermont, District of Columbia, and Minnesota limiting the provision of and/or requiring reporting to state governments of gifts, compensation, and other remuneration to healthcare professionals. Moreover, Section 6002 of PPACA includes new requirements for pharmaceuticals manufacturers, among others, to report certain financial arrangements with physicians and teaching hospitals, as defined in PPACA, including reporting any payment or “transfer of value” made or distributed to prescribers and teaching hospitals,, and reporting any ownership and investment interests held by physicians and their immediate family members and applicable group purchasing organizations during the preceding calendar year. Section 6002 of PPACA includes in its reporting requirements a broad range of transfers of value (such as, for example, consulting fees, charitable contributions, payments for research, and grants) and excludes a transfer of anything the value of which is less than $10, unless the aggregate amount of such transfers of value to a recipient exceeds $100 annually. The Centers for Medicare & Medicaid Services, or CMS, issued its final rule implementing Section 6002 of PPACA in February 2013, stating that data collection would be required as of August 1, 2013, and manufacturers must report the data for August through December of 2013 to CMS by March 31, 2014. CMS will release the data on a public website by September 30, 2014. Failure to so report could subject companies to significant financial penalties. Several states currently have similar laws and more states may enact similar legislation. Reporting and potential public disclosure of these expenses may make it more difficult to recruit physicians for assistance with activities that would be helpful to our business. Tracking and reporting the required expenses may result in considerable expense and additional resources.

If our operations are found to be in violation of any of the laws described above or any other governmental regulations that apply to us, we may be subject to penalties, including civil and criminal penalties, damages, fines, the curtailment or restructuring of our operations, the exclusion from participation in federal and state healthcare programs and imprisonment, any of which could adversely affect our ability to operate our business and our financial results.

Even though we have obtained approval to market XTANDI in the United States, we are subject to ongoing regulatory obligations and review, including post-approval requirements that could result in the withdrawal of XTANDI from the market. XTANDI was approved for the treatment of post-chemotherapy mCRPC patients under the FDA’s priority review program, which provides for an expedited review for drugs that may offer significant improvement in treatment or provide treatment where no satisfactory alternative therapy exists. Even though we have obtained approval to market XTANDI in the United States, we are subject to extensive ongoing obligations and continued regulatory review from the FDA and other applicable regulatory agencies, such as continued adverse event reporting requirements. There may also be additional FDA post-marketing obligations, all of which may result in significant expense and limit our ability to commercialize XTANDI in the United States or potentially other jurisdictions.

We and the manufacturers of XTANDI are also required to comply with current cGMP regulations which include requirements relating to quality control and quality assurance as well as the corresponding maintenance of records and documentation. In addition, regulatory agencies subject an approved product, its manufacturer and the manufacturer’s facilities to continual review and inspections. The subsequent discovery of previously unknown problems with XTANDI, including adverse events of unanticipated severity or frequency, or problems with the facilities where XTANDI is manufactured, may result in restrictions on the marketing of XTANDI, up to and including withdrawal of XTANDI from the market. If our manufacturing facilities or those of our suppliers fail to comply with applicable regulatory requirements, such noncompliance could result in regulatory action and additional costs to us. Failure to comply with applicable FDA and other regulatory requirements may subject us to administrative or judicially imposed sanctions, including:

• issuance of Form 483 notices or Warning Letters by the FDA or other regulatory agencies;

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• imposition of fines and other civil penalties;

• criminal prosecutions;

• injunctions, suspensions or revocations of regulatory approvals;

• suspension of any ongoing clinical trials;

• total or partial suspension of manufacturing;

• delays in commercialization;

• refusal by the FDA to approve pending applications or supplements to approved applications filed by us or Astellas;

• refusals to permit drugs to be imported into or exported from the United States;

• restrictions on operations, including costly new manufacturing requirements; and

• product recalls or seizures.

The policies of the FDA and other regulatory agencies may change and additional government regulations may be enacted that could prevent or delay regulatory approval of XTANDI in other indications or further restrict or regulate post-approval activities. We cannot predict the likelihood, nature or extent of adverse government regulation that may arise from future legislation or administrative action, either in the United States or abroad. If we are not able to maintain regulatory compliance, we or Astellas might not be permitted to market XTANDI and our business would suffer.

If any promotional activities that we undertake fail to comply with the regulations and guidelines of the FDA and applicable foreign regulatory agencies, we may be subject to warnings or enforcement actions that could harm our business. Physicians may prescribe drugs for uses that are not described in the drug’s labeling or for uses that differ from those tested in clinical studies and approved by the FDA or foreign regulatory authorities. Regulatory authorities generally do not regulate the behavior of physicians in their choice of treatments. Regulatory authorities do, however, restrict communications on the subject of uses outside of the approved labeling, or “off-label” uses. Companies cannot actively promote approved drugs for off-label uses but may in some jurisdictions and under specified conditions disseminate articles published in peer-reviewed journals that discuss off-label uses of approved products to physicians. To the extent allowed, we may in the future disseminate peer-reviewed articles on our products to physicians. If our promotional activities for XTANDI and any other potential future product candidate for which we may receive regulatory approval fail to comply with these regulations or guidelines, we may be subject to warnings from, or enforcement by, these authorities.

We may be subject to product liability or other litigation, which could result in an inefficient allocation of our critical resources, delay the implementation of our business strategy, limit sales of XTANDI and limit commercialization of any other potential future products that we may develop and, if successful, materially and adversely harm our business and financial condition as a result of the costs of liabilities that may be imposed thereby. Our business exposes us to the risk of product liability claims that is inherent in the development, manufacturing, distribution and sale of pharmaceutical products. If XTANDI or any potential future product candidate harms people, or is alleged to be harmful, we may be subject to costly and damaging product liability claims brought against us by clinical trial participants, consumers, health care providers, corporate partners or others. We have product liability insurance covering commercial sales of XTANDI and our ongoing clinical trials. However, the amount of insurance we maintain may not be adequate to cover all liabilities that we may incur. If we are unable to obtain insurance at an acceptable cost or otherwise protect against potential product liability claims, we may be exposed to significant litigation costs and liabilities, which may materially and adversely affect our business and financial position. If we are sued for injuries allegedly caused by XTANDI or any of our current or future product candidates, our litigation costs and liability could exceed our total assets and our ability to pay. Regardless of merit or eventual outcome, liability claims may result in:

• decreased demand for XTANDI and any potential future product candidate that we may develop;

• injury to our reputation;

• withdrawal of clinical trial participants;

• significant costs to defend the related litigation;

• substantial monetary awards to trial participants or patients;

• loss of revenue; and

• the inability to commercialize any other products that we may develop.

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In addition, we may from time to time become involved in various lawsuits and legal proceedings which arise in the ordinary course of our business, such as our litigation with the Regents of the University of California. See Part II, Item 1, “Legal Proceedings.” Any litigation to which we are subject could require significant involvement of our senior management and may divert management’s attention from our business and operations. Litigation costs or an adverse result in any litigation that may arise from time to time may adversely impact our operating results or financial condition.

Risks Related to the Operation of our Business

We have a history of net losses and we may incur substantial losses in the foreseeable future as we continue our development and commercialization activities and may never achieve or maintain profitability. We have incurred cumulative net losses of $323.6 million since inception through June 30, 2013, and expect to incur substantial additional losses in the foreseeable future as we continue to finance the commercialization of XTANDI in the U.S. market, clinical and preclinical studies of enzalutamide and our early-stage technologies, and our corporate overhead costs. Our operating losses have had and will continue to have an adverse impact on our working capital, total assets and stockholders’ equity. We and our collaboration partner Astellas commenced commercial sales of XTANDI in the United States for the treatment of post-chemotherapy mCRPC patients on September 13, 2012. XTANDI’s sales and profit potential is unproven. We did not generate any collaboration revenue attributable to U.S. XTANDI sales until the third quarter of 2012 and we did not generate any collaboration revenue attributable to ex-U.S. XTANDI sales until the second quarter of 2013. We do not know when, or if, we will become profitable, or whether XTANDI will be approved for sale in the United States, EU, Canada or South Korea for any indication other than treatment of post-chemotherapy mCRPC patients or will be approved for sale in any other market for any indication. We may never achieve profitability and even if we do, we may not be able to sustain or increase profitability on a quarterly or annual basis.

Our significant level of indebtedness and operating lease obligations could adversely affect our financial condition. In addition, we may not have sufficient funds to service our indebtedness and lease obligations when payments are due. At June 30, 2013, we had outstanding $258.8 million of the Convertible Notes, and $41.6 million of minimum lease commitments under operating leases. We may also incur additional indebtedness to meet future financing needs. Our substantial indebtedness could have significant effects on our business, results of operations and financial condition. For example, it could:

• make it more difficult for us to satisfy our financial obligations, including with respect to the Convertible Notes and operating leases;

• increase our vulnerability to general adverse economic, industry and competitive conditions;

• reduce the availability of our cash resources to fund our operations because we will be required to dedicate a substantial portion of our cash resources to the payment of principal and interest on our indebtedness and operating lease payments;

• limit our flexibility in planning for, or reacting to, changes in our business and the industry in which we operate;

• prevent us from raising funds necessary to purchase the Convertible Notes following a fundamental change, which includes a non-stock takeover of our company and certain other merger and business combination transactions;

• place us at a competitive disadvantage compared to our competitors that are less highly leveraged and that, therefore, may be able to take advantage of opportunities that our leverage prevents us from exploring; and

• limit our ability to obtain additional financing.

Each of these factors may have a material and adverse effect on our financial condition and viability.

Historically, we have financed our operations primarily through public offerings of our common stock, proceeds from the issuance of the Convertible Notes and from up-front, development milestone and cost-sharing payments received pursuant to our collaboration agreement with Astellas that we entered into in October 2009, or the Astellas Collaboration Agreement, and our former collaboration agreement with Pfizer. We did not generate any revenue attributable to XTANDI sales until the third quarter of 2012. The sales and profit potential of XTANDI is unproven. At June 30, 2013, we had cash, cash equivalents and short-term investments totaling $245.9 million available to fund our operations. Until we can generate a sufficient amount of profit and positive cash flows from sales of XTANDI, which we may never do, our ability to make payments on the Convertible Notes and our operating leases when they become due and to satisfy our other cash requirements will depend on our existing cash resources and future financing activity, if any.

We may need additional funds to support our operations, and such funding may not be available to us on acceptable terms, or at all, which would force us to delay, scale back or eliminate some or all of our development programs and other operations, restructure or refinance our indebtedness, or any combination of the foregoing. Raising additional capital may

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subject us to unfavorable terms, cause dilution to our existing stockholders, restrict our operations or require us to relinquish rights to our product candidates and technologies. We have a history of net losses and we expect to incur substantial additional losses in the foreseeable future. Our future capital requirements will depend on many factors, including without limitation:

• costs associated with commercialization of XTANDI for post-chemotherapy mCRPC patients in the United States;

• the timing and magnitude of sales of XTANDI for post-chemotherapy mCRPC patients;

• whether any changes are made to the scope of our ongoing clinical development activities;

• the scope and results of our and our collaboration partner’s preclinical and clinical trials;

• whether we experience delays in our preclinical and clinical development programs;

• whether opportunities to acquire additional product candidates arise and the timing and costs of acquiring and developing those product candidates;

• whether we are able to enter into additional third-party collaborative partnerships to develop and/or commercialize potential future product candidates on terms, including development and commercialization cost share terms, that are acceptable to us;

• the timing and requirements of, and the costs involved in, conducting studies required to obtain regulatory approvals for XTANDI or potential future product candidates from the FDA and comparable foreign regulatory agencies;

• the availability of third parties to perform the key development tasks for XTANDI and potential future product candidates, including conducting preclinical and clinical studies and manufacturing our product candidates to be tested in those studies, and the associated costs of those services;

• expenses associated with, and the outcome of, ongoing litigation;

• the costs involved in preparing, filing, prosecuting, maintaining, defending the validity of and enforcing patent claims and other costs related to patent rights and other intellectual property rights, including litigation costs and the results of such litigation; and

• interest payments and potential cash settlement of the Convertible Notes and operating lease payments.

Based on our current expectations, we believe our capital resources at June 30, 2013, combined with our anticipated future cash flows, will be sufficient to fund our currently planned operations for at least the next 12 months. This estimate is based on a number of assumptions that may prove to be wrong, including assumptions regarding net sales of XTANDI, potential XTANDI approvals in new markets and for other indications, and potential receipt of profit sharing, royalty, and milestone payments under our Astellas Collaboration Agreement, and we could exhaust our available cash, cash equivalents and short-term investments earlier than presently anticipated. For example, we may be required or choose to seek additional capital to fund the costs of commercialization of XTANDI in the United States, to expand our preclinical and clinical development activities for XTANDI and other existing or potential future product candidates, if we face challenges or delays in connection with our clinical trials, to maintain minimum cash balances that we deem reasonable and prudent, or in the event a fundamental change occurs under the terms of the Convertible Notes, which would give the holders of the Convertible Notes the right to require us to purchase their Convertible Notes in cash.

We may seek to raise additional funds through public or private financing or other arrangements, as our development programs or other operations may require. Our ability to raise additional funds on acceptable terms will be dependent on the climate of worldwide capital markets, which could be challenging. Any additional equity financing would be dilutive to stockholders, and debt financing, if available, may involve restrictive covenants and increase our interest expense, leverage and operating and financial costs. Our failure to raise capital when needed may harm our business and operating results.

Our failure to raise capital when needed may harm our business and operating results. If we are unable to raise additional funds when needed, we could be required to delay, scale back or eliminate some or all of our development programs and other operations, restructure or refinance our indebtedness, or any combination of the foregoing. We may seek to raise additional funds through public or private financing or other arrangements. We cannot assure you that any of these actions could be effected on satisfactory terms, if at all, or that they would yield sufficient funds to make required payments on the Convertible Notes or to fund our other liquidity needs. We cannot assure you that our business will have access to sufficient cash resources to enable us to pay our indebtedness, including the Convertible Notes, or to fund our other liquidity needs.

The proposed changes to financial accounting standards, if adopted, could require our operating leases to be recognized on our consolidated balance sheet. In addition to our significant level of indebtedness, we have significant obligations relating to our current operating leases. At June 30, 2013, we had minimum lease commitments of $41.6 million. These leases are classified as operating leases and disclosed in footnotes to our consolidated financial statements, but are not reflected as liabilities on our consolidated balance sheets.

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In August 2010, the FASB, and the International Accounting Standards Board, or IASB, issued a joint discussion paper highlighting proposed changes to financial accounting standards for leases. Currently, Accounting Standards Codification 840, or ASC 840, “Leases,” requires that operating leases are classified as off-balance sheet transactions and only operating lease expense for the current year is included in the consolidated statements of operations. The proposed changes to ASC 840 could potentially require recognition of our operating leases as assets and liabilities on our consolidated balance sheets. The right to use the leased property would be capitalized as an asset and the present value of future lease payments would be accounted for as a liability. The proposed changes are under the review of FASB, IASB and other accounting authorities, and are expected to be finalized in 2013. A retroactive adoption may be required when the changes become effective. We have not quantified the impact of this proposed standard on our consolidated financial statements. If our current operating leases are recognized on our consolidated financial statements, it could likely result in a significant increase in the liabilities reflected on our consolidated balance sheets and an increase in the interest expense and depreciation and amortization expense reflected in our consolidated statements of operations.

*Changes in our effective income tax rate could negatively impact our net income. We are subject to income taxes in various jurisdictions. Our effective income tax rate in the future could be adversely affected by a number of factors, including: interpretations of existing tax laws, changes in tax laws and rates, future levels of research and development expenditures, changes in the mix of earnings in countries with differing statutory tax rates in which we may conduct business, changes in the valuation of deferred tax assets and liabilities, changes in accounting standards and other items. The impact of our income tax provision resulting from these items may be significant and could have a negative impact on our net income.

We are regularly subject to audits by tax authorities in the jurisdictions in which we conduct business. Although we believe our tax positions are reasonable, the final outcome of tax audits and related litigation could be materially different than that reflected in our historical income tax provisions and accruals, and we could be subject to assessments of additional taxes and/or substantial fines or penalties. The resolution of any audits or litigation could have an adverse effect on our financial position and results of operations.

We and our subsidiaries are engaged in a number of intercompany transactions. Although we believe that these transactions reflect arm’s length terms and that proper transfer pricing documentation is in place, which should be respected for tax purposes, the transfer prices and terms and conditions of such transactions may be scrutinized by tax authorities, which could result in additional tax and/or penalties becoming due.

Intellectual property protection for our product candidates is crucial to our business, and is subject to a significant degree of legal risk, particularly in the life sciences industry. The success of our business will depend in part on our ability to obtain and maintain intellectual property protection, primarily patent protection, covering XTANDI and any potential future product candidates, as well as successfully defending these patents against third-party challenges. We and our collaborators will only be able to protect XTANDI and our potential future product candidates from unauthorized commercialization by third parties to the extent that valid and enforceable patents or trade secrets cover them. Furthermore, the degree of future protection of our proprietary rights is uncertain because legal means afford only limited protection and may not adequately protect our rights or permit us or our potential future collaborators to gain or keep our competitive advantage.

The patent positions of life sciences companies can be highly uncertain and involve complex legal and factual questions for which important legal principles remain unresolved. Further, changes in either the patent laws or in interpretations of patent laws in the United States or other countries may diminish the value of our intellectual property rights. Accordingly, we cannot predict the breadth of claims that may be granted or enforced for our patents or for third-party patents that we have licensed. For example:

• we or our licensors might not have been the first to make the inventions covered by each of our pending patent applications and issued patents;

• we or our licensors might not have been the first to file patent applications for these inventions;

• others may independently develop similar or alternative technologies or duplicate any of our technologies;

• it is possible that none of our pending patent applications or the pending patent applications of our licensors will result in issued patents;

• our issued patents and future issued patents, or those of our licensors, may not provide a basis for protecting commercially viable products, may not provide us with any competitive advantages, or may be challenged by third parties and invalidated or rendered unenforceable; and

• we may not develop additional proprietary technologies or product candidates that are patentable.

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Our existing and any future patent rights may not adequately protect XTANDI or any potential future product candidates, which could impact our ability to generate revenues or profits. We cannot guarantee that any of our pending or future patent applications will mature into issued patents, or that any of our current or future issued patents will adequately protect XTANDI or any potential future product candidates from competitors. Nor can we guarantee that any of our present or future issued patents will not be challenged by third parties, or that they will withstand any such challenge. If we are not able to obtain adequate protection for, or defend, the intellectual property position of XTANDI or any other potential future product candidates, then we may not be able to attract collaborators to acquire or partner our development programs. Further, even if we can obtain protection for and defend the intellectual property position of XTANDI or any potential future product candidates, we or any of our potential future collaborators still may not be able to exclude competitors from developing or marketing competing drugs. Should this occur, we and our potential future collaborators may not generate any revenues or profits from XTANDI or any potential future product candidates or our revenue or profits would be significantly decreased.

We could become subject to litigation or other challenges regarding intellectual property rights, which could divert management attention, cause us to incur significant costs, prevent us from selling or using the challenged technology and/or subject us to competition by lower priced generic products. In recent years, there has been significant litigation in the United States and elsewhere involving pharmaceutical patents and other intellectual property rights. In particular, generic pharmaceutical manufacturers have been very aggressive in challenging the validity of patents held by proprietary pharmaceutical companies, especially if these patents are commercially significant. We are facing patent oppositions in Europe and Australia, and we may face similar challenges to our existing or future patents covering XTANDI or any potential future product candidates. If a generic pharmaceutical company or other third party were able to successfully invalidate any of our present or future patents, XTANDI and any potential future product candidates that may ultimately receive marketing approval could face additional competition from lower priced generic products that would result in significant price and revenue erosion and have a significantly negative impact on the commercial viability of the affected product candidate(s).

In the future, we may be a party to litigation to protect our intellectual property or to defend our activities in response to alleged infringement of a third party’s intellectual property. These claims and any resulting lawsuit, if successful, could subject us to significant liability for damages and invalidation, or a narrowing of the scope, of our proprietary rights. These lawsuits, regardless of their success, would likely be time-consuming and expensive to litigate and resolve and would divert management time and attention. Any potential intellectual property litigation also could force us to do one or more of the following:

• discontinue our products that use or are covered by the challenged intellectual property; or

• obtain from the owner of the allegedly infringed intellectual property right a license to sell or use the relevant technology, which license may not be available on reasonable terms, or at all.

If we are forced to take any of these actions, our business may be seriously harmed. Although we carry general liability insurance, our insurance does not cover potential claims of this type.

In addition, our patents and patent applications, or those of our licensors, could face other challenges, such as interference proceedings, opposition proceedings, re-examination proceedings, inter parties review, post-grant review, derivation proceedings and pre-grant submissions. Any such challenge, if successful, could result in the invalidation of, or in a narrowing of the scope of, any of our patents and patent applications subject to the challenge. Any such challenges, regardless of their success, would likely be time-consuming and expensive to defend and resolve and would divert our management’s time and attention.

We may in the future initiate claims or litigation against third parties for infringement to protect our proprietary rights or to determine the scope and validity of our proprietary rights or the proprietary rights of competitors. These claims could result in costly litigation and the diversion of our technical and management personnel and we may not prevail in making these claims.

We rely on license agreements for certain aspects of our product candidates and our technology. We may in the future need to obtain additional licenses of third-party technology that may not be available to us or are available only on commercially unreasonable terms, and which may cause us to operate our business in a more costly or otherwise adverse manner that was not anticipated. We have entered into agreements with third-party commercial and academic institutions to license intellectual property rights and technology. For example, we have a license agreement with UCLA pursuant to which we were granted exclusive worldwide rights to certain UCLA patents related to XTANDI and a family of related compounds. Some of these license agreements, including our license agreement with UCLA, contain diligence and milestone-based termination provisions, in which case our failure to meet any agreed upon diligence requirements or milestones may allow the licensor to terminate the agreement. If our licensors terminate our license agreements or if we are unable to maintain the exclusivity of our exclusive license agreements, we may be unable to continue to develop and commercialize XTANDI or any potential future product candidates based on licensed intellectual property rights and technology.

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From time to time we may be required to license technology from additional third parties to further develop XTANDI and any future product candidates. Should we be required to obtain licenses to any third-party technology, including any such patents based on biological activities or required to manufacture our product candidates, such licenses may not be available to us on commercially reasonable terms, or at all. The inability to obtain any third-party license required to develop any of our product candidates could cause us to abandon any related development efforts, which could seriously harm our business and operations.

We may become involved in disputes with Astellas or any potential future collaborators over intellectual property ownership, and publications by our research collaborators and scientific advisors could impair our ability to obtain patent protection or protect our proprietary information, which, in either case, could have a significant impact on our business. Inventions discovered under research, material transfer or other such collaboration agreements, including the Astellas Collaboration Agreement, may become jointly owned by us and the other party to such agreements in some cases and the exclusive property of either party in other cases. Under some circumstances, it may be difficult to determine who owns a particular invention, or whether it is jointly owned, and disputes could arise regarding ownership of those inventions. These disputes could be costly and time consuming and an unfavorable outcome could have a significant adverse effect on our business if we were not able to protect or license rights to these inventions. In addition, our research collaborators and scientific advisors generally have contractual rights to publish our data and other proprietary information, subject to our prior review. Publications by our research collaborators and scientific advisors containing such information, either with our permission or in contravention of the terms of their agreements with us, may impair our ability to obtain patent protection or protect our proprietary information, which could significantly harm our business.

Trade secrets may not provide adequate protection for our business and technology. We also rely on trade secrets to protect our technology, especially where we believe patent protection is not appropriate or obtainable. However, trade secrets are difficult to protect. While we use reasonable efforts to protect our trade secrets, our or any potential collaborators’ employees, consultants, contractors or scientific and other advisors may unintentionally or willfully disclose our information to competitors. If we were to enforce a claim that a third party had illegally obtained and was using our trade secrets, our enforcement efforts would be expensive and time consuming, and the outcome would be unpredictable. In addition, courts outside the United States are sometimes less willing to protect trade secrets. Moreover, if our competitors independently develop equivalent knowledge, methods or know-how, it will be more difficult or impossible for us to enforce our rights and our business could be harmed.

*Significant disruptions of information technology systems or breaches of data security could adversely affect our business. Our business is increasingly dependent on critical, complex and interdependent information technology systems to support business processes as well as internal and external communications. The size and complexity of our computer systems make them vulnerable to breakdown, malicious intrusion and computer viruses. We have experienced at least one successful intrusion into our computer systems, and although it did not have a material adverse effect on our operations, there can be no assurance of a similar result in the future. We have developed systems and processes that are designed to protect our information and prevent data loss and other security breaches, including systems and processes designed to reduce the impact of a security breach; however, such measures cannot provide absolute security, and we have taken and are taking additional security measures to protect against any future intrusion. Any failure to protect against breakdowns, malicious intrusions and computer viruses may result in the impairment of production and key business processes. In addition, our systems are potentially vulnerable to data security breaches, whether by employees or others, which may expose sensitive data to unauthorized persons. Such data security breaches could lead to the loss of trade secrets or other intellectual property, or could lead to the public exposure of personal information of our employees, clinical trial patients, customers, and others. Such disruptions and breaches of security could expose us to liability and have a material adverse effect on the operating results and financial condition of our business.

Risks Related to Ownership of Our Common Stock and Convertible Notes

Our operating results are unpredictable and may fluctuate. If our operating results are below the expectations of securities analysts or investors, the market value of our common stock and the trading price of the Convertible Notes could decline. Our operating results are difficult to predict and will likely fluctuate from quarter to quarter and year to year. Due to the competitive market for mCRPC therapies, XTANDI sales will be difficult to predict from period to period. As a result, you should not rely on XTANDI sales results in any period as being indicative of future performance and sales of XTANDI may be below the expectation of securities analysts or investors in the future. Additionally, you should not place undue reliance on the forward looking statements about expectations for future XTANDI sales from our partner Astellas, as Medivation may not agree with such statements, or from Medivation, as XTANDI sales results are difficult to predict. We believe that our quarterly and annual results of operations may be affected by a variety of factors, including:

• the level of demand for XTANDI;

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• the extent to which coverage and reimbursement for XTANDI is available from government and health administration authorities, private health insurers, managed care programs and other third-party payors;

• the timing, cost and level of investment in our and Astellas’ sales and marketing efforts to support XTANDI sales;

• the timing, cost and level of investment in our research and development activities involving XTANDI and our product candidates;

• the cost of manufacturing XTANDI, and the amount of legally mandated discounts to government entities, other discounts and rebates, product returns and other gross-to-net deductions;

• the risk/benefit profile, cost and reimbursement of existing and potential future drugs which compete with XTANDI;

• the timeliness and accuracy of financial information we receive from Astellas regarding XTANDI net sales globally, and shared U.S. development and commercialization costs for XTANDI incurred by Astellas, including the accuracy of the estimates Astellas uses in calculating any such financial information; and

• expenditures that we will or may incur to acquire or develop additional technologies, product candidates and products.

In addition, from time to time, we enter into collaboration agreements with other companies that include development funding and significant upfront and milestone payments, and we expect that amounts earned from our collaboration agreements will continue to be an important source of our revenues. Accordingly, our revenues will also depend on development funding and the achievement of development and clinical milestones under our existing collaboration with Astellas, as well as any potential future collaboration and license agreements. These upfront and milestone payments may vary significantly from quarter to quarter and any such variance could cause a significant fluctuation in our operating results from one quarter to the next. Further, we measure compensation cost for stock-based awards made to employees at the grant date of the award, based on the fair value of the award, and recognize the cost as an expense over the employee’s requisite service period. As the variables that we use as a basis for valuing these awards change over time, including our underlying stock price and stock price volatility, the magnitude of the expense that we must recognize may vary significantly.

For these and other reasons, it is difficult for us to accurately forecast future profits or losses. As a result, it is possible that in some quarters our operating results could be below the expectations of securities analysts or investors. Various securities analysts follow our financial results and issue reports on us. These reports include information about our historical financial results as well as the analysts’ estimates of our future performance. The analysts’ estimates are based upon their own opinions and are often different from our estimates or expectations. If our operating results are below the expectations of securities analysts or investors, the market value of our common stock and the trading price of the Convertible Notes could decline, perhaps substantially.

We have been named as a defendant in a purported securities class action lawsuit. This lawsuit could result in substantial damages and may divert management’s time and attention from our business and operations. In March 2010, the first of several putative securities class action lawsuits was commenced in the U.S. District Court for the Northern District of California, naming as defendants us and certain of our officers. The lawsuits are largely identical and allege violations of the Securities Exchange Act of 1934, as amended. The plaintiffs allege, among other things, that the defendants disseminated false and misleading statements about the effectiveness of dimebon for the treatment of Alzheimer’s disease. The plaintiffs purport to seek damages, an award of their costs and injunctive relief on behalf of a class of stockholders who purchased or otherwise acquired our common stock between September 21, 2006 and March 2, 2010. The actions were consolidated in September 2010 and, in April 2011, the court entered an order appointing Catoosa Fund, L.P. and its attorneys as lead plaintiff and lead counsel. Thereafter, the lead plaintiff filed a consolidated amended complaint, which was dismissed without prejudice as to all defendants in August 2011. The lead plaintiff filed a second amended complaint in November 2011. In March 2012, the court dismissed the second amended complaint with prejudice and entered judgment in favor of defendants. Lead plaintiff filed a notice of appeal to the U.S. Circuit Court of Appeals for the Ninth Circuit in April 2012. The appeal is fully briefed and we are awaiting notice of the date for oral argument.

Our management believes that we have meritorious positions and intends to defend this lawsuit vigorously. However, this lawsuit is subject to inherent uncertainties, and the actual cost will depend upon many unknown factors. The outcome of the litigation is necessarily uncertain, we could be forced to expend significant resources in the defense of the suit and we may not prevail. Monitoring and defending against legal actions is time consuming for our management and detracts from our ability to

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fully focus our internal resources on our business activities. In addition, we may incur substantial legal fees and costs in connection with the litigation and, although we believe we are entitled to coverage under the relevant insurance policies, subject to a $350,000 retention, coverage could be denied or prove to be insufficient. We are not currently able to estimate the possible cost to us from this matter, as this lawsuit is currently at an early stage and we cannot be certain how long it may take to resolve this matter or the possible amount of any damages that we may be required to pay. We have not established any reserves for any potential liability relating to this lawsuit. It is possible that we could, in the future, incur judgments or enter into settlements of claims for monetary damages. A decision adverse to our interests on these actions could result in the payment of substantial damages, or possibly fines, and could have a material adverse effect on our cash flow, results of operations and financial position. In addition, the uncertainty of the currently pending litigation could lead to more volatility in our stock price.

Our stock price has been and may continue to be volatile, and our stockholders’ investment in our stock could decline in value. The market prices for our securities and those of other life sciences companies have been highly volatile and often unrelated or disproportionate to the operating performance of those companies, and may continue to be highly volatile in the future. There has been particular volatility in the market prices of securities of life sciences companies because of problems or successes in a given market segment or because investor interest has shifted to other segments. These broad market and industry factors may cause the market price of our common stock to decline, regardless of our operating performance. We have no control over this volatility and can only focus our efforts on our own operations, and even these may be affected due to the state of the capital markets.

In the past, following periods of large price declines in the public market price of a company’s securities, securities class action litigation has often been initiated against that company. New litigation of this type could result in substantial costs and diversion of management’s attention and resources, which would hurt our business. Any adverse determination in litigation could also subject us to significant liabilities.

The following factors, in addition to other risk factors described herein, may have a significant impact on the market price of our common stock:

• our ability to meet the expectations of investors related to the commercialization of XTANDI;

• inaccurate sales or cash forecasting of XTANDI;

• the timing and amount of revenues generated from sale of XTANDI;

• actual or anticipated variations in quarterly operating results;

• legislation or regulatory actions or decisions affecting XTANDI, including the timing and outcome of the EMA’s decision relating to XTANDI, or product candidates, including those of our competitors;

• changes in laws or regulations applicable to XTANDI;

• the receipt or failure to receive the additional funding necessary to conduct our business;

• the progress and results of preclinical studies and clinical trials of our product candidates conducted by us, Astellas or any future collaborative partners or licensees, if any, and any delays in enrolling a sufficient number of patients to complete clinical trials of our product candidates;

• the announcement by our competitors of results from clinical trials of their products or product candidates;

• selling by existing stockholders and short-sellers;

• announcements of technological innovations or new commercial products by our competitors or us;

• developments concerning proprietary rights, including patents;

• developments concerning our collaboration with Astellas or any future collaborations;

• publicity regarding us, our product candidates or those of our competitors, including research reports published by securities analysts;

• regulatory developments in the United States and foreign countries;

• litigation, including the purported securities class action lawsuits pending against us and certain of our officers;

• hedging or arbitrage trading activity involving our common stock, including in connection with arbitrage strategies employed or that may be employed by investors in the Convertible Notes;

• economic and other external factors or other disaster or crisis; and

• period-to-period fluctuations in financial results.

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These factors and fluctuations, as well as political and other market conditions, may adversely affect the market price of our common stock. Securities-related class action litigation is often brought against a company following periods of volatility in the market price of its securities. Securities-related litigation, whether with or without merit, could result in substantial costs and divert management’s attention and financial resources, which could harm our business and financial condition, as well as the market price of our common stock. Additionally, volatility or lack of positive performance in our stock price may adversely affect our ability to retain or recruit key employees, all of whom have been or will be granted stock options as a part of their compensation.

A decrease in the market price of our common stock would also likely adversely impact the trading price of the Convertible Notes. The market price of our common stock could also be affected by possible sales of our common stock by investors who view the Convertible Notes as a more attractive means of equity participation in us and by hedging or arbitrage trading activity that we expect to develop involving our common stock. This trading activity could, in turn, affect the trading prices of the notes. This may result in greater volatility in the trading price of the Convertible Notes than would be expected for non-convertible debt securities.

We rely on Astellas to timely deliver important financial information relating to net sales of XTANDI. In the event that this information is inaccurate, incomplete, or not timely, we will not be able to meet our financial reporting obligations as required by the SEC. Under the Astellas Collaboration Agreement, Astellas has exclusive control over the flow of information relating to net sales of XTANDI that we are dependent upon to meet our SEC reporting obligations. Astellas is required under the Astellas Collaboration Agreement to provide us with timely and accurate financial data related to net sales of XTANDI so that we may meet our reporting requirements under federal securities laws. In the event that Astellas fails to provide us with timely and accurate information, we may incur significant liability with respect to federal securities laws, our disclosure controls and procedures under the Sarbanes-Oxley Act of 2002, or Sarbanes-Oxley, may be inadequate, and we may be required to restate our financial statements, any of which could adversely affect the market price of our common stock and Convertible Notes and subject us to securities litigation.

Failure to maintain effective internal control over financial reporting in accordance with Sarbanes-Oxley could have a material adverse effect on our stock price and the trading price of the Convertible Notes. Section 404 of Sarbanes-Oxley and the related rules and regulations of the SEC require an annual management assessment of the effectiveness of our internal control over financial reporting and a report by our independent registered public accounting firm attesting to the effectiveness of our internal control over financial reporting at the end of the fiscal year. If we fail to maintain the adequacy of our internal control over financial reporting, as such standards are modified, supplemented or amended from time to time, we may not be able to ensure that we can conclude on an ongoing basis that we have effective control over financial reporting in accordance with Sarbanes-Oxley and the related rules and regulations of the SEC. If we cannot in the future favorably assess, or our independent registered public accounting firm is unable to provide an unqualified attestation report on, the effectiveness of our internal control over financial reporting, investor confidence in the reliability of our financial reports may be adversely affected, which could have a material adverse effect on our stock price and the trading price of our outstanding Convertible Notes.

We do not intend to pay dividends on our common stock for the foreseeable future. We do not expect for the foreseeable future to pay dividends on our common stock. Any future determination to pay dividends on or repurchase shares of our common stock will be at the discretion of our board of directors and will depend upon, among other factors, our success in completing sales or partnerships of our programs, our results of operations, financial condition, capital requirements, contractual restrictions and applicable law.

Our principal stockholders exert substantial influence over us and may exercise their control in a manner adverse to other interests. Certain stockholders and their affiliates own a substantial amount of our outstanding common stock. These stockholders may have the power to direct our affairs and be able to determine the outcome of certain matters submitted to stockholders for approval. Because a limited number of persons control us, transactions could be difficult or impossible to complete without the support of those persons. Subject to applicable law, it is possible that these persons will exercise control over us in a manner adverse to other interests.

Provisions of our charter documents, our stockholder rights plan and Delaware law could make it more difficult for a third party to acquire us, even if the offer may be considered beneficial by our stockholders. Provisions of the Delaware General Corporation Law could discourage potential acquisition proposals and could delay, deter or prevent a change in control. The anti-takeover provisions of the Delaware General Corporation Law impose various impediments to the ability of a third party to acquire control of us, even if a change in control would be beneficial to our existing stockholders. Specifically, Section 203 of the Delaware General Corporation Law, unless its application has been waived, provides certain default anti-takeover protections in connection with transactions between us and an “interested stockholder.” Generally, Section 203 prohibits stockholders who, alone or together with their affiliates and associates, own more than 15% of the subject company

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from engaging in certain business combinations for a period of three years following the date that the stockholder became an interested stockholder of such subject company without approval of the board or the vote of two-thirds of the shares held by the independent stockholders. Our board of directors has also adopted a stockholder rights plan, or “poison pill,” which would significantly dilute the ownership of a hostile acquirer. Additionally, provisions of our amended and restated certificate of incorporation and bylaws could deter, delay or prevent a third party from acquiring us, even if doing so would benefit our stockholders, including without limitation, the authority of the board of directors to issue, without stockholder approval, preferred stock with such terms as the board of directors may determine.

We may issue additional shares of our common stock or instruments convertible into shares of our common stock, including additional shares associated with the potential conversion of the Convertible Notes, which could cause our stock price to fall and cause dilution to existing stockholders. We may from time to time issue additional shares of common stock or other instruments convertible into, or exchangeable or exercisable for, shares of our common stock. In addition, we may elect to satisfy all or a portion of our conversion obligations under the Convertible Notes with shares of our common stock. The issuance of additional shares of our common stock, including upon conversion of some or all of the Convertible Notes, would dilute the ownership interests of existing holders of our common stock. Dilution will be greater if the conversion rate of the Convertible Notes is adjusted upon the occurrence of certain events specified in the indenture to the Convertible Notes.

The issuance of a substantial number of shares of our common stock, the sale of a substantial number of shares of our common stock that were previously restricted from sale in the public market, or the perception that these issuances or sales might occur, could depress the market price of our common stock and in turn adversely impact the trading price of the Convertible Notes. In addition, holders of the Convertible Notes may hedge their investment in the Convertible Notes by short selling our common stock, which could depress the price of our common stock. As a result, investors may not be able to sell their shares of our securities at a price equal to or above the price they paid to acquire them.

Furthermore, the issuance of additional shares of our common stock, or the perception that such issuances might occur, could impair our ability to raise capital through the sale of additional equity securities.

Provisions in the indenture for the Convertible Notes may deter or prevent a business combination. Under the terms of the indenture governing the Convertible Notes, the occurrence of a fundamental change would require us to repurchase all or a portion of the Convertible Notes in cash, or, in some circumstances, increase the conversion rate applicable to the Convertible Notes. In addition, the indenture for the Convertible Notes prohibits us from engaging in certain mergers or business combination transactions unless, among other things, the surviving entity assumes our obligations under the Convertible Notes. These and other provisions could prevent or deter a third party from acquiring us even where the acquisition could be beneficial to our stockholders.

Any adverse rating of the Convertible Notes may negatively affect the price of our common stock. We do not intend to seek a rating on the Convertible Notes. However, if a rating service were to rate the Convertible Notes and if such rating service were to assign the Convertible Notes a rating lower than the rating expected by investors or were to lower its rating on the Convertible Notes below the rating initially assigned to the Convertible Notes or otherwise announce its intention to put the Convertible Notes on credit watch, the price of our common stock could decline.

The conditional conversion feature of the Convertible Notes, if triggered, may adversely affect our financial condition and operating results. In the event the conditional conversion feature of the Convertible Notes is triggered, holders of notes will be entitled to convert their notes at any time during specified periods at their option. If one or more holders elect to convert their Convertible Notes, unless we satisfy our conversion obligation by delivering solely shares of our common stock (other than cash in lieu of any fractional share), we would be required to settle all or a portion of our conversion obligation through the payment of cash, which could adversely affect our liquidity. We may, at any time prior to the final settlement method election date, irrevocably elect to satisfy our conversion obligation with respect to each subsequent conversion date in a combination of cash and shares of our common stock, if any, with a specified dollar amount of $1,000, in which case we will no longer be permitted to settle the principal portion of any converted Convertible Notes in shares of our common stock. In addition, even if holders do not elect to convert their Convertible Notes, we could be required under applicable accounting rules to reclassify all or a portion of the outstanding principal of the notes as a current rather than long-term liability, which would result in a material reduction of our net working capital.

The accounting method for convertible debt securities that may be settled in cash, such as the Convertible Notes, could have a material effect on our reported financial results. Under Financial Accounting Standards Board Accounting Standards Codification 470-20, “Debt with Conversion and Other Options,” or ASC 470-20, an entity must separately account for the liability and equity components of the convertible debt instruments (such as the Convertible Notes) that may be settled entirely or partially in cash upon conversion in a manner that reflects the issuer’s economic interest cost. The effect of ASC 470-20 on the accounting for the Convertible Notes is that the equity component is required to be included in the additional paid-in capital

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section of stockholders’ equity on our consolidated balance sheet and the value of the equity component would be treated as original issue discount for purposes of accounting for the debt component of the Convertible Notes. As a result, we will be required to record a greater amount of non-cash interest expense as a result of the amortization of the discounted carrying value of the Convertible Notes to their face amount over the term of the Convertible Notes. We will report lower net income in our financial results because ASC 470-20 will require interest to include both the current period’s amortization of the debt discount and the instrument’s coupon interest, which could adversely affect our reported or future financial results, the market price of our common stock and the trading price of the Convertible Notes.

In periods in which we report net income, we use the “if-converted” method in calculating the diluted net income per common share effect of the assumed conversion of our contingently Convertible Notes. Under the “if-converted” method, interest expense related to the Convertible Notes is added back to net income, and the Convertible Notes are assumed to be converted into common shares at the beginning of the period (or the issuance date). The use of the “if-converted” method could adversely impact our diluted net income per share should we report any net income.

The repurchase rights and events of default features of the Convertible Notes, if triggered, may adversely affect our financial condition and operating results. Following a fundamental change under the indenture governing the Convertible Notes, dated as of March 19, 2012 between us and Wells Fargo Bank, National Association as Trustee, as supplemented by the first supplemental indenture dated as of March 19, 2012, or the Indenture, holders of the Convertible Notes will have the right to require us to purchase their Convertible Notes for cash. In addition, if an event of default under the Convertible Notes is triggered, the trustee or the holders of the Convertible Notes may declare the principal amount of the Convertible Notes, plus accrued and unpaid interest thereon, to be immediately due and payable. In either event, we would be required to make cash payments to satisfy our obligations, which could adversely affect our liquidity. In addition, even if the repurchase rights are not exercised or the payment of principal and interest of Convertible Notes is not accelerated, we could be required under applicable accounting rules to reclassify all or a portion of the outstanding principal of the Convertible Notes as a current rather than long-term liability, which could result in a material reduction of our net working capital.

ITEM 6. EXHIBITS.

See the Exhibit List which follows the signature page of this Quarterly Report on Form 10Q, which is incorporated by reference.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Date: August 8, 2013	MEDIVATION, INC.
	By:	/s/    C. Patrick Machado
	Name:	C. Patrick Machado
	Title:	Chief Business Officer and Chief Financial Officer
		(Duly Authorized Officer and Principal Financial Officer)

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		Incorporated By Reference
Exhibit Number	Exhibit Description	Form		File No.		Exhibit		Filing Date		Filed Herewith
3.1	Amended and Restated Certificate of Incorporation.		10-QSB		000-20837		3.1(a)		8/15/2005
3.2	Certificate of Amendment of Amended and Restated Certificate of Incorporation.		10-QSB		000-20837		3.1(b)		8/15/2005
3.3	Certificate of Amendment to the Amended and Restated Certificate of Incorporation.		10-QSB		000-20837		3.1(c)		8/15/2005
3.4	Amended and Restated Certificate of Designations of the Series B Convertible Preferred Stock of Orion Acquisition Corp. II		10-QSB		000-20837		3.1(d)		8/15/2005
3.5	Certificate of Designations of the Series C Junior Participating Preferred Stock of Medivation, Inc.		10-KSB		001-32836		3.1(d)		2/19/2008
3.6	Certificate of Amendment of Amended and Restated Certificate of Incorporation.		8-K		001-32836		3.1		9/24/2012
3.7	Certificate of Amendment of Amended and Restated Certificate of Incorporation.		8-K		001-32836		3.2		9/24/2012
3.8	Amended and Restated Bylaws of Medivation, Inc.		10-K		001-32836		3.2		3/16/2009
4.1	Common Stock Certificate		10-Q		001-32836		4.1		5/9/2012
4.2	Rights Agreement, dated as of December 4, 2006, between Medivation, Inc. and American Stock Transfer & Trust Company, as Rights Agent, which includes the form of Certificate of Designations of the Series C Junior Participating Preferred Stock of Medivation, Inc. as Exhibit A, the form of Right Certificate as Exhibit B and the Summary of Rights to Purchase Preferred Shares as Exhibit C.		8-K		001-32836		4.1		12/4/2006
4.3	Indenture, dated March 19, 2012, between Medivation, Inc. and Wells Fargo Bank, National Association, as Trustee.		8-K		001-32836		4.1		3/19/2012
4.4	First Supplemental Indenture, dated March 19, 2012, between Medivation, Inc. and Wells Fargo Bank, National Association, as Trustee (including the form of 2.625% convertible senior notes due 2017).		8-K		001-32836		4.2		3/19/2012
10.1	Compensation Information for Non-Employee Directors.		8-K		001-32836		10.1		4/29/2013
10.2	Fourth Amendment to Lease, dated as of June 26, 2013, by and between Knickerbocker Properties, Inc. XXXIII and Medivation, Inc.									X
10.3	The Medivation, Inc. Employee Stock Purchase Plan.		8-K		001-32836		10.1		7/1/2013
10.4	The Medivation, Inc. Amended and Restated 2004 Equity Incentive Award Plan.		8-K		001-32836		10.2		7/1/2013
10.5	The Medivation, Inc. 2013 Cash Performance Incentive Plan.		8-K		001-32836		10.3		7/1/2013

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		Incorporated By Reference
Exhibit Number	Exhibit Description	Form	File No.	Exhibit	Filing Date	Filed Herewith
12.1	Computation of Ratio of Earnings to Fixed Charges					X
31.1	Certification pursuant to Rule 13a-14(a)/15d-14(a).					X
31.2	Certification pursuant to Rule 13a-14(a)/15d-14(a).					X
32.1†	Certifications of Chief Executive Officer and Chief Financial Officer.					X
101.INS	XBRL Instance Document.					X
101.SCH	XBRL Taxonomy Extension Schema Document.					X
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.					X
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.					X
101.LAB	XBRL Taxonomy Extension Labels Linkbase Document.					X
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.					X

† The certifications attached as Exhibit 32.1 accompanying this Quarterly Report on Form 10-Q are not deemed filed with the Securities and Exchange Commission and are not to be incorporated by reference into any filing of Medivation, Inc., under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made before or after the date of this Quarterly Report on Form 10-Q, irrespective of any general incorporation language contained in such filing.

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EX-10.2

Exhibit 10.2

FOURTH AMENDMENT TO LEASE

This FOURTH AMENDMENT TO LEASE (“Amendment”) is made and entered into as of the 26th day of June 2013 (the “Effective Date”), by and between KNICKERBOCKER PROPERTIES, INC. XXXIII, a Delaware corporation (“Landlord”), and MEDIVATION, INC., a Delaware corporation (“Tenant”).

RECITALS:

A. Landlord and Tenant entered into that certain Office Lease dated as of December 28, 2011 (the “Original Lease”), pursuant to which Landlord leased to Tenant and Tenant leased from Landlord those certain premises (the “Original Premises”) consisting of the entire rentable area (which the parties hereto stipulate contains 57,172 rentable square feet) on the thirty-fifth (35th) and thirty-sixth (36th) floors of that certain building located as 525 Market Street, San Francisco, California (the “Building”).

B. Landlord and Tenant entered into that certain (i) First Amendment to Lease dated as of December 28, 2011 (“First Amendment”), pursuant to which certain technical modifications were made to the Original Lease, (ii) that certain Second Amendment to Lease dated as of July 6, 2012 (“Second Amendment”), pursuant to which certain dates and terms set forth in the Original Lease were confirmed and ratified, and (iii) that certain Third Amendment to Lease dated as of September 27, 2012 (“Third Amendment”), pursuant to which the Original Premises was expanded by the entire rentable area of the thirty-eighth (38th) floor of the Building (the “2012 Expansion Premises,” and which, along with the Original Premises, is referred to as the “Current Premises”). The Original Lease, as modified by the First Amendment, the Second Amendment, and the Third Amendment is referred to herein in the “Lease.”

C. Landlord and Tenant hereby stipulate that the Current Premises contains 85,698 rentable square feet.

D. The parties desire to further amend the Lease to (i) expand the Current Premises to include those certain premises depicted on Exhibit “A” attached hereto (which the parties hereto stipulate contains 12,724 rentable square feet) on the thirty-seventh (37th) floor of the Building (the “2013 Expansion Space”), and (ii) otherwise modify the Lease, all upon the terms and conditions hereinafter set forth.

E. The 2013 Expansion Space is currently occupied by Spencer Stuart (the “Existing Tenant”) pursuant to a lease (the “Existing Tenant Lease”) scheduled to expire as of August 31, 2013.

NOW, THEREFORE, in consideration of the foregoing recitals and the mutual covenants contained herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1. Capitalized Terms. All capitalized terms used herein shall have the same meanings given such terms in the Lease unless expressly superseded by the terms of this Amendment.

2. Tenant’s Lease of 2013 Expansion Space.

(a) From and after the Expansion Space Commencement Date (as defined in Section 3 below), the Current Premises shall be expanded to include the 2013 Expansion Space for the Expansion Space Term (as defined in Section 3 below), and shall be leased by Tenant on the same terms and conditions set forth in the Lease, subject to the modifications set forth in this Amendment. From and after the Expansion Space Commencement Date, the term “Premises” as used in the Lease shall mean the Current Premises and the 2013 Expansion Space.

(b) From and after the Expansion Space Commencement Date, and for all purposes of the Lease (as amended by this Amendment), the definition of the term “Rentable Area of the Premises” set forth in Article 1(g) of the Original Lease is hereby deleted and the following text is substituted in lieu thereof: “98,422 rentable square feet.”

(c) The option to extend the Term set forth in Exhibit “H” of the Original Lease (the “Option”) shall, by virtue of this Amendment, apply to (i) the Current Premises (i.e., the 35th floor, the 36th floor, and the 38th floor) (“Option A”); or (ii) the Original Premises and the 2013 Expansion Space (i.e., the 35th floor, the 36th floor, and the portion of the 37th floor leased hereby) (“Option B”); or (iii) the Current Premises and the 2013 Expansion Space (i.e., the 35th floor, 36th floor, the portion of the 37th floor leased hereby, and the 38th floor) (“Option C”); or (iv) the 35^th floor and the 36^th floor (“Option D”). If Tenant exercises the Option in accordance with the terms of such Exhibit “H,” Tenant’s Interest Notice delivered in accordance with such Exhibit “H” shall expressly and irrevocably elect to apply the Option to Option A, Option B, Option C or Option D (the “Option Space Election”). If Tenant fails to expressly include the Option Space Election in the Interest Notice, Tenant shall be irrevocably deemed to apply the Option to the entire Premises (i.e., the 35th floor, 36th floor, the portion of the 37th floor leased hereby, and the 38th floor) and not to any lesser part thereof. All other terms and provisions of such Exhibit “H” shall continue in full force and effect.

(d) Tenant’s acceptance of possession of the 2013 Expansion Space (whether before or after the Expansion Space Commencement Date) shall constitute Tenant’s acknowledgment that the 2013 Expansion Space is in good order and satisfactory condition. For purposes of determining whether Tenant has accepted possession of the 2013 Expansion Space, Tenant shall be deemed to have done so when Tenant first moves any of its personnel and/or furnishings and/or equipment into the 2013 Expansion Space, except to the extent that Tenant is explicitly authorized in the Lease or by Landlord’s agreement in writing to do any of the foregoing without being deemed to have accepted possession of the 2013 Expansion Space.

3. Expansion Space Commencement Date, Expansion Space Expiration Date and Expansion Space Term. The term of Tenant’s lease of the 2013 Expansion Space shall (i) commence on the date which is One Hundred-Twenty (120) calendar days following the date Landlord delivers the 2013 Expansion Premises to Tenant in the condition required by this Amendment free of any the Existing Tenant’s occupancy, which period shall be extended on a day-for-day basis for Landlord Delays (as such term is defined in the Workletter Agreement attached hereto as Exhibit “B” and made a part hereof) (the “Expansion Space Commencement Date”), and (ii) expire on the Expiration Date set forth in Lease Article 1(j) and as confirmed pursuant to the Second Amendment (the “Expansion Space Expiration Date”). The One

2

Hundred-Twenty (120) day period, as extended for Landlord Delays, is referred to herein as the “Design and Construction Period.” The period of time commencing on the Expansion Space Commencement Date and expiring on the Expansion Space Expiration Date shall be referred to herein as the “Expansion Space Term.” Landlord shall deliver the 2013 Expansion Space to Tenant upon the last to occur of the following: (i) the full execution and delivery of this Amendment by Landlord, (ii) Tenant’s delivering the Letter of Credit (as defined in Section 7(a) below) and the first full Monthly Base Rent and the Monthly Base Rent for any Partial Month applicable to the 2013 Expansion Space for the Expansion Space Term, and (iii) the date the Existing Tenant Lease has expired or terminated and the Existing Tenant has vacated the 2013 Expansion Space (the date on which the last to occur of such items (i), (ii), and (iii) is referred to herein as the “Expansion Space Delivery Date”). Landlord anticipates being able to deliver the 2013 Expansion Space to Tenant, subject to the terms hereof, on or about September 1, 2013. In the event the Expansion Space Commencement Date is not the first day of a calendar month (such month in which the Expansion Space Commencement Date occurs being referred to herein as the “Partial Month”) the Monthly Base Rent for the 2013 Expansion Space for such Partial Month shall be prorated as provided in the Lease. Once the Expansion Space Commencement Date has been determined, Landlord and Tenant shall execute a written confirmation stating the actual Expansion Space Commencement Date, but failure of the parties to execute such a writing shall have no impact on the Expansion Space Commencement Date.

4. Base Rent.

(a) The Base Rent payable by Tenant for the 2013 Expansion Space shall be calculated separate and apart from the Base Rent payable by Tenant for the Current Premises. During the Expansion Space Term, the Base Rent payable by Tenant for the 2013 Expansion Space shall be as set forth in the following schedule:

Months of  Expansion Space Term	Annual Base Rent		Monthly Base Rent		Annual Rental Rate per Rentable Square Foot of the 2013 Expansion Space
Month 1 through the end of Month 12	$	788,888.00	$	65,740.67	$	62.00
Month 13 through the end of Month 24	$	801,612.00	$	66,801.00	$	63.00
Month 25 through the end of Month 36	$	814,336.00	$	67,861.33	$	64.00
Month 37 through the end of Month 48	$	827,060.00	$	68,921.67	$	65.00
Month 49 through the end of Month 60	$	839,784.00	$	69,982.00	$	66.00
Month 61 through the Expiration Date	$	852,508.00	$	71,042.33	$	67.00

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(b) Landlord hereby agrees that subsequent to the Expansion Space Delivery Date and prior to the expiration of the Design and Construction Period (the “Early Occupancy Period”), Tenant shall have the right to occupy the 2013 Expansion Premises for the conduct of Tenant’s business, provided that all of the terms and conditions of the Lease shall apply, other than Tenant’s obligation to pay (i) Monthly Base Rent or (ii) Tenant’s Percentage Share (Direct Expenses) or Tenant’s Percentage Share (Taxes), during the Early Occupancy Period. Tenant’s obligation to pay Monthly Base Rent, Tenant’s Percentage Share of Direct Expenses and Tenant’s Percentage Share of Taxes with respect to the 2013 Expansion Premises shall commence as provided in Section 3 above, regardless of whether Tenant has taken occupancy of the 2013 Expansion Space during the Early Occupancy Period. During the Early Occupancy Period, Tenant shall, in accordance with the terms of this Amendment, be responsible for any Additional Rent for any above-Building standard services (e.g., after-hours HVAC) payable during such early occupancy.

5. Operating Expenses and Tax Expenses.

(a) Tenant’s Percentage Share (Direct Expenses) is 8.4271% for the Current Premises and shall, as of the Expansion Space Commencement Date, be increased by 1.2512% with respect to the 2013 Expansion Space to an aggregate of 9.6783%. Tenant’s Percentage Share (Taxes) is 8.3045% for the Current Premises and shall, as of the Expansion Space Commencement Date, be increased by 1.2330% with respect to the 2013 Expansion Space to an aggregate of 9.5375%.

(b) The Base Year used to calculate increases in Tenant’s Percentage Share (Direct Expenses) and Tenant’s Percentage Share (Taxes) with respect to the 2013 Expansion Space only shall be the 2014 calendar year. The Base Year used to calculate Tenant’s Percentage Share (Direct Expenses) and Tenant’s Percentage Share (Taxes) with respect to (i) the 2012 Expansion Premises shall remain the 2013 calendar year and (ii) the Original Premises shall remain the 2012 calendar year. Tenant shall pay Tenant’s Percentage Share (Direct Expanses) and Tenant’s Percentage Share (Taxes) with respect to the Current Premises and the Expansion Space in accordance with Lease Articles 5 and 6, respectively.

6. Condition of 2013 Expansion Space. Tenant agrees to accept the 2013 Expansion Space in its then current “AS IS” condition as of the Expansion Space Delivery Date without any obligation on Landlord’s part to construct or pay for any tenant improvements or refurbishment work in the 2013 Expansion Space (except as provided in Exhibit “B” attached hereto). Tenant shall

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commence promptly on and after the Expansion Space Delivery Date (pursuant to Section 3) to construct the Tenant Improvements (as defined in Exhibit “B” attached hereto and made a part hereof) to the 2013 Expansion Space in accordance with the terms of the Workletter attached hereto and made a part of hereof as Exhibit “B.”

7. Security Deposit; First Month’s Rent.

(a) Concurrently with the execution of this Amendment, Tenant shall, as security for the payment and performance of Tenant’s obligations under this Amendment and the Lease, deliver to Landlord an irrevocable standby letter of credit (the “Letter of Credit”), the form of which is attached hereto as Exhibit “C,” issued by Bank of America, N.A. (or such other financial institution acceptable to Landlord) with an initial stated amount of $1,056,092.00 (the “Stated Amount”). Nothing in this Section 7(a) shall modify Tenant’s obligations with respect to letter of credit number 3118769, as amended.

Provided that, as of the applicable “Reduction Date” set forth below, Tenant (i) has not previously committed an Event of Default which is not then continuing and (iii) is not then in a voluntary or involuntary bankruptcy proceeding and has not made an assignment for the benefit of creditors, and provided further that, on or prior to the applicable Reduction Date, Tenant tenders to Landlord a replacement Letter of Credit or an amendment to the existing Letter of Credit, conforming in all respects to the requirements of this Section, setting forth the applicable Stated Amount as of such Reduction Date, the Stated Amount shall be reduced in accordance with the following schedule:

Reduction Date	Stated Amount
First day of the 25th month following the Expansion Space Commencement Date	$	846,146.00
First day of the 37th month following the Expansion Space Commencement Date	$	636,200.00
First day of the 49th month following the Expansion Space Commencement Date	$	426,254.00

No further reductions to the Stated Amount are otherwise scheduled after the 49th month of the Expansion Term. In the event the Stated Amount is reduced pursuant to the foregoing, and provided that Tenant timely tenders the replacement or amended Letter of Credit to Landlord in the form required herein, Landlord shall exchange the Letter of Credit then held by Landlord for the replacement or amended Letter of Credit tendered by Tenant. Landlord shall reasonably cooperate with Tenant in memorializing the above-scheduled reductions in the Stated Amount.

Landlord may, in its sole discretion, require that the Letter of Credit be confirmed by a financial institution satisfactory to Landlord. If, at any time, an Event of Default occurs, Landlord shall have the right to draw down on the Letter of Credit, or so much thereof as necessary, in payment of Rent, in reimbursement of any expense incurred by Landlord in accordance with this Amendment and the Lease, and in payment of any damages incurred by Landlord by reason of such Event of Default for which Tenant is responsible in accordance with

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the terms of this Amendment and the Lease. In such event, Tenant shall within two (2) business day following written request therefor from Landlord remit to Landlord a sufficient amount in cash to restore the Letter of Credit to the original amount or, at Landlord’s election, cause the Stated Amount to be fully reinstated to its amount immediately prior to such Event of Default. If the entire Letter of Credit has not been utilized, the remaining amount of the Letter of Credit will be delivered to Tenant or to whoever is then the holder of Tenant’s interest in the Lease, without interest, within sixty (60) days after full performance of this Amendment by Tenant. Tenant shall not be entitled to any interest on the Letter of Credit. Tenant hereby waives the provisions of California Civil Code Section 1950.7, and all other provisions of law, now or hereafter in force, which provide that Landlord may claim from a security deposit only those sums reasonably necessary to remedy any Events of Default with respect to the payment of Rent, to repair damage caused by Tenant or to clean the Premises, it being agreed that Landlord may, in addition, claim those sums reasonably necessary to compensate Landlord for any other loss or damage, foreseeable or unforeseeable, caused by the act or omission of Tenant or any officer, employee, agent or invitee of Tenant which led to the Event of Default. Upon the occurrence of an Event of Default, in addition to Landlord’s right to draw on the Letter of Credit in whole or in part, Tenant shall, at Landlord’s option, replace the Letter of Credit with a cash deposit equal to then outstanding Stated Amount (and the Letter of Credit shall be returned to Tenant upon such payment and the expiration of any applicable preference period). Any cash remaining in Landlord’s possession after a partial or full draw on the Letter of Credit shall be retained as an additional security deposit and the terms of this Article shall apply with respect thereto, mutatis mutandis.

(b) Concurrently with the execution of this Amendment, Tenant shall pay to Landlord the first full installment of Monthly Base Rent attributable to the 2013 Expansion Space. On or before the Expansion Space Commencement Date, Tenant shall pay to Landlord the Monthly Base Rent for any Partial Month.

8. Right of First Offer. Schedule 1 to Exhibit “G” to the Original Lease is hereby deleted and replaced with Schedule 1 attached hereto and made a part hereof.

9. Amendment Brokers. Each of Landlord and Tenant hereby represents and warrants to the other that it has not had any dealings with any real estate broker or agent in connection with the negotiation of this Amendment other than Cushman & Wakefield of California, Inc. for Landlord and Colliers International CA, Inc. for Tenant (collectively, the “Amendment Brokers”). Each party agrees to indemnify and defend the other party harmless from any and all claims, demands, losses, liabilities, lawsuits, judgments, and costs and expenses (including, without limitation, reasonable attorneys’ fees) with respect to any leasing commission or equivalent compensation claimed by any broker or agent other than the Amendment Brokers. Landlord agrees to compensate the Amendment Brokers in accordance with a separate agreement.

10. No Event of Default. In the event an Event of Default shall occur under the Lease or this Amendment prior to the Expansion Space Commencement Date, this Amendment shall automatically terminate and be of no further force and effect.

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11. No Further Modification. Except as set forth in this Amendment, all of the terms and provisions of the Lease shall remain unmodified and in full force and effect.

[signatures on following page]

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IN WITNESS WHEREOF, the parties have caused this Amendment to be duly executed by their duly authorized representatives as of the date first above written.

“LANDLORD”:	KNICKERBOCKER PROPERTIES, INC. XXXIII, a Delaware corporation
	By:	/s/ Karen M. Wilbrecht
		Karen M. Wilbrecht
		Its: Executive Director
“TENANT”:	MEDIVATION, INC., a Delaware corporation
	By:	/s/ Patrick Machado
		Name:	Patrick Machado
		Title:	CFO & CBO
	By:
		Name:
		Title:

Schedule “1”

(to Original Lease Exhibit G)

The following Tenant is occupying a portion of 37th floor:

ClearSlide, Inc. (Suite 3750) – lease scheduled to expire February 28, 2015

Schedule 1

1

EXHIBIT “A”

THE 2013 EXPANSION SPACE

EXHIBIT A

1

EXHIBIT “B”

WORKLETTER AGREEMENT

This Workletter Agreement (the “Workletter”) is executed simultaneously with, is dated as of, and is an exhibit to, that certain Fourth Amendment to Lease (the “Amendment”), between KNICKERBOCKER PROPERTIES, INC. XXXIII, a Delaware corporation (“Landlord”), and MEDIVATION, INC., a Delaware corporation (“Tenant”), pursuant to which Tenant is leasing that certain 2013 Expansion Space, more particularly described in the Amendment, at 525 Market Street, San Francisco, California (the “Building”). Capitalized terms not otherwise defined herein shall have the meanings assigned thereto in the Amendment. In consideration of the parties entering into the Amendment and of the mutual promises and covenants hereinafter contained, Landlord and Tenant hereby agree as follows:

1. Proposed and Final Plans.

(a) Tenant shall cause to be prepared and delivered to Landlord, for Landlord’s approval, the following proposed preliminary space plan (“Proposed Plans”) for all improvements Tenant desires to complete or have completed in the 2013 Expansion Space (the “Tenant Improvements”) which shall include the design standards set forth on Schedule “B-1” and Landlord expressly consents to the installation of card readers within the stairwells between the leased floors as part of the Tenant Improvements (provided that Tenant shall, at Landlord’s request, remove any such readers and repair any damage caused thereby upon the expiration or earlier termination of the Lease with respect to such floors):

(i) Architectural drawings (consisting of floor construction plan, ceiling lighting and layout, power, and telephone plan).

(ii) Mechanical drawings (consisting of HVAC, electrical (including any UPS equipment), telephone, and plumbing). Tenant acknowledges that part of the Tenant Improvements shall include (but shall not be limited to) the replacement of the existing Tuttle & Bailey terminal air boxes located in the 2013 Expansion Space with Building-standard Titus VAV boxes, and that all such Titus VAV boxes shall comply with the Building’s Replacement VAV Box Design Criteria (August 26, 2011).

(iii) Finish schedule (consisting of wall finishes and floor finishes and miscellaneous details, including all window treatments which shall be Building-standard “Mecho” shades throughout the 2013 Expansion Space).

(b) All architectural drawings shall be prepared at Tenant’s sole cost and expense (subject to Section 3, below) by a licensed architect designated by Tenant and approved by Landlord, whom Tenant shall employ. Tenant shall deliver one set of reproducible architectural drawings to Landlord. All mechanical drawings (to the extent required by the nature and extent of the Tenant Improvements) shall be prepared at Tenant’s sole cost and expense (subject to Section 3, below) by a licensed engineer selected by Tenant and approved by Landlord (which approval may be withheld or conditioned in Landlord’s sole and absolute discretion), whom Tenant shall employ. Tenant shall reimburse Landlord for all reasonable out-of-pocket costs incurred by Landlord in reviewing the Proposed Plans and Final Plans. All costs and charges by Landlord’s consultants shall be deducted from the Tenant Improvements Allowance (or charged to Tenant) without mark-up on an “open book” basis (which shall not exceed Twenty Thousand Dollars ($20,000.00)).

EXHIBIT B

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(c) Within ten (10) business days after Landlord’s receipt of the architectural drawings, Landlord shall advise Tenant of any changes or additional information required to obtain Landlord’s approval.

(d) Within ten (10) business days after receipt of mechanical drawings, if any, Landlord shall advise Tenant of any changes reasonably required to obtain Landlord’s approval.

(e) If Landlord disapproves of or requests additional information regarding the Proposed Plans, Tenant shall, within fifteen (15) days thereafter, revise the Proposed Plans disapproved by Landlord and resubmit such plans to Landlord or otherwise provide such additional information to Landlord. Landlord shall, within ten (10) business days after receipt of Tenant’s revised plans, advise Tenant of any additional changes which may be required to obtain Landlord’s approval. If Landlord reasonably disapproves the revised plans specifying the reason therefor, or requests further additional information, Tenant shall, within ten (10) days of receipt of Landlord’s required changes, revise such plans and resubmit them to Landlord or deliver to Landlord such further information as Landlord has requested. Landlord shall, again within ten (10) business days after receipt of Tenant’s revised plans, advise Tenant of further changes, if any, reasonably required for Landlord’s approval. This process shall continue until Landlord has approved Tenant’s revised Proposed Plans. After the Proposed Plans are finally approved by Landlord, Tenant shall submit to Landlord construction drawings prepared by Tenant’s architect (or prepared by a subcontractor with respect to the fire sprinkler drawings and specifications) (“Final Plans”) which shall contain all (to the extent appropriate) plans to be bid and built from and shall include all fully engineered mechanical, electrical, HVAC, plumbing, and fire life/safety drawings, all based upon the Proposed Plans, and shall be compatible with the design, construction and equipment of the Building, comply with all Laws, be capable of logical measurement and construction, contain all such information as may be required for the construction of the Tenant Improvements.

Landlord shall approve the Final Plans, or such portion as has from time to time been submitted, within fifteen (15) business days after receipt of same or designate by notice given within such time period to Tenant the specific changes reasonably required to be made to the proposed Final Drawings in order to correct any Design Problem and shall return the proposed Final Drawings to Tenant. Tenant shall make the minimum changes necessary in order to correct any such Design Problem and shall return the proposed Final Drawings to Landlord, which Landlord shall approve or disapprove within fifteen (15) business days after Landlord receives the revised proposed Final Drawings. This procedure shall be repeated until all of the proposed Final Drawings are finally approved by Landlord and written approval has been delivered to and received by Tenant. Landlord agrees not to withhold its approval unreasonably. Tenant shall have no obligation to remove any portion of the Tenant Improvements at the end of the Term unless Landlord notifies Tenant, in a writing concurrently incorporated into Landlord’s approval of the proposed Final Plans, that such removal will be required. As used herein, “Design Problem” shall mean the Final Plans are deemed by Landlord in its good faith judgment to likely (i) have an adverse effect on the structural integrity of the Building; (ii) cause

EXHIBIT B

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possible damage to any of the Building systems (such as HVAC, fire life safety, plumbing, electrical, data/communication, mechanical, or security systems); (iii) be in non-compliance with applicable codes; or (iv) have an adverse effect on the exterior appearance of the Building.

(f) All Proposed Plans and Final Plans shall comply with all applicable statutes, ordinances, regulations, laws, and codes and with the requirements of Landlord’s fire insurance underwriters. Neither review nor approval by Landlord of the Proposed Plans and resulting Final Plans shall constitute a representation or warranty by Landlord that such plans either (i) are complete or suitable for their intended purpose, or (ii) comply with applicable laws, ordinances, codes, regulations, or any insurance requirements, it being expressly agreed by Tenant that Landlord assumes no responsibility or liability whatsoever to Tenant or to any other person or entity for such completeness, suitability or compliance. Tenant shall not make any changes in the approved Final Plans without Landlord’s prior written approval, which shall not be unreasonably withheld or delayed; provided that Landlord may, in the exercise of its sole and absolute discretion, disapprove any proposed changes adversely affecting the Building’s structure, any asbestos-containing materials, systems, equipment or the appearance or value of the Building.

(g) [Intentionally Deleted]

(h) Within thirty (30) days after written request from Tenant, Landlord shall reimburse Tenant in an amount equal to $1,908.60, for Tenant’s architect to complete a preliminary space plan for the Premises, provided that Landlord has been provided with a CAD version of Tenant’s test fit plans, which amount shall not be deducted from the Tenant Allowance.

(i) [Intentionally Deleted]

(j) The term “Landlord Delay” as used in this Workletter shall mean: (1) delay in the giving of authorizations or approvals by Landlord beyond the periods set forth in this Workletter; (2) delay attributable to the interference of Landlord, its agents or contractors with the completion of the Tenant Improvements; and (3) delay by Landlord in administering and paying when due the Tenant Allowance. In no event shall Tenant’s remedies or entitlements for the occurrence of a Landlord Delay be abated, deferred, diminished or rendered inoperative because of a prior, concurrent, or subsequent delay resulting from any action or inaction of Tenant. No Landlord Delay shall be deemed to have occurred unless and until Tenant has given written notice to Landlord specifying the action or inaction which Tenant contends constitutes a Landlord Delay. If such action or inaction is not cured within one (1) business day after Landlord’s receipt of such notice, then a Landlord Delay, as set forth in such notice, shall be deemed to have occurred commencing as of the date Landlord received such notice and continuing for the number of days the substantial completion of the Tenant Improvements was in fact delayed as a direct result of such action or inaction.

EXHIBIT B

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2. Performance of the Tenant Improvements.

(a) Filing of Final Plans, Permits. Tenant, at its sole cost and expense, shall file the Final Plans with the governmental agencies having jurisdiction over the Tenant Improvements. Tenant shall furnish Landlord with copies of all documents submitted to all such governmental agencies and with the authorizations to commence work and the permits for the Tenant Improvements issued by such governmental agencies. Tenant shall not commence the Tenant Improvements until the required governmental authorizations for such work are obtained and delivered to Landlord.

(b) Landlord Approval of Contractors. No later than fifteen (15) days following Landlord’s approval of the Final Plans, Tenant shall enter into a contract for construction of the Tenant Improvements with a general contractor acceptable to Landlord (the “General Contractor”). The General Contractor and Tenant’s construction contract with the General Contractor shall be subject to Landlord’s prior approval, which approval shall not be unreasonably withheld, conditioned or delayed. In the event Landlord requires any of Tenant’s Contractors to obtain payment or performance bonds in connection with the installation of the Tenant Improvements, the cost of such bonds shall be the responsibility of Landlord and shall not be deducted from the Tenant Allowance. The General Contractor shall be responsible for all required construction, management and supervision, including bidding by subcontractors for the various components of the work of the Tenant Improvements. In addition, Tenant shall only utilize for purposes of mechanical, electrical, structural, sprinkler, fire and life safety and asbestos related activities those contractors as specifically designated by Landlord (collectively, the “Essential Subs”). Tenant shall submit to Landlord not less than ten (10) days prior to commencement of construction the following information and items:

(i) The names and addresses of the other subcontractors, and sub-subcontractors (collectively, together with the General Contractor and Essential Subs, the “Tenant’s Contractors”) Tenant intends to employ in the construction of the Tenant Improvements. Landlord shall have the right to approve or disapprove Tenant’s Contractors, and Tenant shall employ, as Tenant’s Contractors, only those persons or entities approved by Landlord, which approval shall not be unreasonably withheld, conditioned or delayed (and failure to respond within ten (10) business days following delivery of a request for approval shall be deemed disapproval). All contractors and subcontractors engaged by or on behalf of Tenant for the 2013 Expansion Space shall be licensed contractors, possessing good labor relations, capable of performing quality workmanship and working in harmony with Landlord’s contractors and subcontractors and with other contractors and subcontractors on the job site. All work shall be coordinated with any general construction work in the Building. Tenant agrees to give the contractor employed by Landlord in the Building an equal opportunity to submit a bid for the Tenant Improvements, but Tenant shall not be obligated to hire such contractor.

(ii) The scheduled commencement date of construction, the estimated date of completion of construction work, fixturing work, and estimated date of occupancy of the 2013 Expansion Space by Tenant.

(iii) Itemized statement of estimated construction cost, including permits and fees, architectural, engineering, and contracting fees.

(iv) Certified copies of insurance policies or certificates of insurance as hereinafter described. Tenant shall not permit Tenant’s Contractors to commence work until the required insurance has been obtained and certified copies of policies or certificates have been delivered to Landlord.

EXHIBIT B

4

(c) Access to 2013 Expansion Space. Tenant, its employees, designers, contractors and workmen shall have access to and primary use of the 2013 Expansion Space to construct the Tenant Improvements, provided that Tenant and its employees, agents, contractors, and suppliers only access the 2013 Expansion Space via the Building freight elevator work in harmony and do not interfere with the performance of other work in the Building by Landlord, Landlord’s contractors, other tenants or occupants of the Building (whether or not the terms of their respective leases have commenced) or their contractors. If at any time such entry shall cause, or in Landlord’s reasonable judgment threaten to cause, such disharmony or interference, Landlord may terminate such permission upon twenty-four (24) hours’ written notice to Tenant, and thereupon, Tenant or its employees, agents, contractors, and suppliers causing such disharmony or interference shall immediately withdraw from the 2013 Expansion Space and the Building until Landlord determines such disturbance no longer exists.

(d) Landlord’s Right to Perform. Landlord shall have the right, but not the obligation, to perform, on behalf of and for the account of Tenant, subject to reimbursement by Tenant, any of the Tenant Improvements which (i) Landlord reasonably deems necessary to be done on an emergency basis, (ii) pertains to structural components or the general Building systems, (iii) pertains to the erection of temporary safety barricades or signs during construction, (iv) affects any asbestos-containing materials. Except in case of emergency, Landlord shall give prior reasonable written notice to Tenant of its intention to perform such work.

(e) Warranties. On completion of the Tenant Improvements, Tenant shall provide Landlord with copies of all warranties of at least one (1) year duration on all the Tenant Improvements. At Landlord’s request, Tenant shall enforce, at Tenant’s expense, all guarantees and warranties made and/or furnished to Tenant with respect to the Tenant Improvements.

(f) Protection of Building. All work performed by Tenant shall be performed with a minimum of interference with other tenants and occupants of the Building and shall conform to the Building Rules and Regulations attached as Exhibit “B,” to the Original Lease and those rules and regulations governing construction in the Building as Landlord or Landlord’s Agent may impose. Tenant will take all reasonable and customary precautionary steps to protect its facilities and the facilities of others affected by the Tenant Improvements and to properly police same and Landlord shall have no responsibility for any loss by theft or otherwise. Construction equipment and materials are to be located in confined areas and delivery and loading of equipment and materials shall be done at such reasonable locations and at such time as Landlord shall direct so as not to burden the operation of the Building. Landlord shall advise Tenant in advance of any special delivery and loading dock requirements. Tenant shall at all times keep the 2013 Expansion Space and adjacent areas free from accumulations of waste materials or rubbish caused by its suppliers, contractors or workmen. Landlord may require daily clean-up if required for fire prevention and life safety reasons or applicable laws and reserves the right to do clean-up at the expense of Tenant if Tenant fails to comply with Landlord’s cleanup requirements. At the completion of the Tenant Improvements, Tenant’s Contractors shall forthwith remove all rubbish and all tools, equipment and surplus materials from and about the 2013 Expansion Space and Building. Any damage caused by Tenant’s Contractors to any portion of the Building or to any property of Landlord or other tenants shall be repaired forthwith after written notice from Landlord to its condition prior to such damage by Tenant at Tenant’s expense.

EXHIBIT B

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(g) Compliance by all Tenant Contractors. Tenant shall impose and enforce all terms hereof on Tenant’s Contractors and its designers, architects and engineers. Landlord shall have the right to order Tenant or any of Tenant’s Contractors, designers, architects or engineers who willfully violate the provisions of this Workletter to cease work and remove himself or itself and his or its equipment and employees from the Building.

(h) Accidents, Notice to Landlord. Tenant’s Contractors shall assume responsibility for the prevention of accidents to its agents and employees and shall take all reasonable safety precautions with respect to the work to be performed and shall comply with all reasonable safety measures initiated by the Landlord and with all applicable laws, ordinances, rules, regulations and orders of any public authority for the safety of persons or property. Tenant shall advise the Tenant’s Contractors to report to Landlord any injury to any of its agents or employees and shall furnish Landlord a copy of the accident report filed with its insurance carrier within three (3) days of its occurrence.

(i) Required Insurance. Tenant shall cause Tenant’s Contractors to secure, pay for, and maintain during the performance of the construction of the Tenant Improvements, insurance in the following minimum coverages and limits of liability:

(i) Workmen’s Compensation and Employer’s Liability Insurance as required by law.

(ii) Commercial General Liability Insurance (including Owner’s and Contractors’ Protective Liability) in an amount not less than Two Million Dollars ($2,000,000) per occurrence, whether involving bodily injury liability (or death resulting therefrom) or property damage liability or a combination thereof with a minimum aggregate limit of Two Million Dollars ($2,000,000), and with umbrella coverage with limits not less than Ten Million Dollars ($10,000,000). Such insurance shall provide for explosion and collapse, completed operations coverage with a two-year extension after completion of the work, and broad form blanket contractual liability coverage and shall insure Tenant’s Contractors against any and all claims for bodily injury, including death resulting therefrom and damage to the property of others and arising from its operations under the contracts whether such operations are performed by Tenant’s Contractors, or by anyone directly or indirectly employed by any of them.

(iii) Comprehensive Automobile Liability Insurance, including the ownership, maintenance, and operation of any automotive equipment, owned, hired, or non-owned in an amount not less than Five Hundred Thousand Dollars ($500,000) for each person in one accident, and One Million Dollars ($1,000,000) for injuries sustained by two or more persons in any one accident and property damage liability in an amount not less than One Million Dollars ($1,000,000) for each accident. Such insurance shall insure Tenant’s Contractors against any and all claims for bodily injury, including death resulting therefrom, and damage to the property of others arising from its operations under the contracts, whether such operations are performed by Tenant’s Contractors, or by anyone directly or indirectly employed by any of them.

EXHIBIT B

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(iv) “All-risk” builder’s risk insurance upon the entire Tenant Improvements to the full insurance value thereof. Such insurance shall include the interest of Landlord and Tenant (and their respective contractors and subcontractors of any tier to the extent of any insurable interest therein) in the Tenant Improvements and shall insure against the perils of fire and extended coverage and shall include “all-risk” builder’s risk insurance for physical loss or damage including, without duplication of coverage, theft, vandalism, and malicious mischief. If portions of the Tenant Improvements are stored off the site of the Building or in transit to such site are not covered under such “all-risk” builder’s risk insurance, then Tenant shall effect and maintain similar property insurance on such portions of the Tenant Improvements. Any loss insured under such “all-risk” builder’s risk insurance is to be adjusted with Landlord and Tenant and made payable to Landlord as trustee for the insureds, as their interest may appear, subject to the agreement reached by such parties in interest, or in the absence of any such agreement, then in accordance with a final, nonappealable order of a court of competent jurisdiction. If after such loss no other special agreement is made, the decision to replace or not replace any such damaged Tenant Improvements shall be made in accordance with the terms and provisions of the Amendment including, without limitation, this Workletter. The waiver of subrogation provisions contained in Article 15 of the Original Lease shall apply to the “all-risk” builder’s risk insurance policy to be obtained by Tenant pursuant to this paragraph.

All policies (except the workmen’s compensation policy) shall be endorsed to include as additional named insureds Landlord and its officers, employees, and agents, Landlord’s contractors, Landlord’s architect, and such additional persons as Landlord may designate. Such endorsements shall also provide that all additional insured parties shall be given thirty (30) days’ prior written notice of any reduction, cancellation, or nonrenewal of coverage by certified mail, return receipt requested (except that ten (10) days’ notice shall be sufficient in the case of cancellation for nonpayment of premium) and shall provide that the insurance coverage afforded to the additional insured parties thereunder shall be primary to any insurance carried independently by such additional insured parties. Landlord shall furnish a list of names and addresses of parties to be named as additional insureds. The insurance policies required hereunder shall be considered as the primary insurance and shall not call into contribution any insurance then maintained by Landlord. Additionally, where applicable, such policy shall contain a cross-liability and severability or interest clause.

To the fullest extent permitted by law, Tenant (and Tenant’s Contractors) and Landlord (and its contractors) shall indemnify and hold harmless the other party, its officers, agents and employees, from and against all claims, damages, liabilities, losses and expenses of whatever nature, including but not limited to reasonable attorneys’ fees, the cost of any repairs to the 2013 Expansion Space or Building necessitated by activities of the indemnifying party’s contractors, bodily injury to persons or damage to property of the indemnified party, its employees, agents, invitees, licensees, or others, arising out of or resulting from the performance of work by the indemnifying party or its contractors. The foregoing indemnity shall be in addition to the insurance requirements set forth above and shall not be in discharge or substitution of the same, and shall not be limited in any way by any limitations on the amount or type of damages, compensation or benefits payable by or for Tenant’s Contractors under Workers’ or Workmen’s Compensation Acts, Disability Benefit Acts or other Employee Benefit Acts.

EXHIBIT B

7

(j) Quality of Work. The Tenant Improvements shall be constructed in a first-class workmanlike manner using only good grades of material and in compliance with the Final Plans, all insurance requirements, applicable laws and ordinances and rules and regulations of governmental departments or agencies and the rules and regulations adopted by Landlord for the Building.

(k) “As-Built” Plans. Upon completion of the Tenant Improvements, Tenant shall furnish Landlord with “as built” plans for the 2013 Expansion Space, final waivers of lien for the Tenant Improvements, a detailed breakdown of the costs of the Tenant Improvements (which may be in the form of an owner’s affidavit) and evidence of payment reasonably satisfactory to Landlord, and an occupancy permit, certificate of occupancy, or other evidence of the legal right to occupy the 2013 Expansion Space issued by the City of San Francisco for comparable projects in the Building for the 2013 Expansion Space. In addition, upon completion of the Tenant Improvements, Tenant will provide the Building’s architect a CAD file with the construction floor plan showing partitions, doors, door swings and sidelights and such other information as the Building’s architect may require to allow the Building’s architect to update and maintain the “Space Utilization Data Base.” Tenant shall pay the Building’s architect’s fee for this service.

(l) Mechanics’ Liens. Tenant shall not permit any of the Tenant’s Contractors to place any lien upon the Building, and if any such lien is placed upon the Building, Tenant shall within ten (10) days of notice thereof, cause such lien to be discharged of record, by bonding or otherwise. If Tenant shall fail to cause any such lien to be discharged, Landlord shall have the right to have such lien discharged and Landlord’s expense in so doing, including bond premiums, reasonable legal fees and filing fees, shall be immediately due and payable by Tenant.

3. Payment of Costs of the Tenant Improvements.

(a) Subject to the provisions of Paragraph 3(b) below, the Tenant Improvements (including the cost of acquiring and installing the Building Standard window blinds to the extent not in place) shall be installed by Tenant at Tenant’s sole cost and expense. The cost of the Tenant Improvements shall include, and Tenant agrees to pay Landlord for, the following costs, to the extent such costs are triggered by or are attributable to the scope of the work entailed in the Tenant Improvements (“Landlord’s Costs”): (i) the cost of any work performed by Landlord on behalf of Tenant and for any materials and labor furnished on Tenant’s behalf (it being understood that Tenant and Tenant’s Contractor are solely responsible for the installation of the Tenant Improvements), (ii) all permit, design and engineering fees, all HVAC and sprinkler reconfiguration costs, and all life safety costs, (iii) the cost of any services provided to Tenant or Tenant’s Contractors including but not limited to the cost for rubbish removal, hoisting, and utilities to the extent not included in general conditions charges by the general contractor, and (iv) the Supervision Fee plus Landlord’s actual out-of-pocket expenses for review of Tenant’s Proposed Plans and Final Plans (subject to Section 1(b), above). Landlord may render bills to Tenant monthly for Landlord’s Costs (provided that the Supervision Fee shall be billed based on the cost of the Tenant Improvements performed during the period in question). All bills shall be due and payable no later than the thirtieth (30th) day after delivery of such bills to Tenant, and Landlord may apply the Tenant Allowance against such Landlord’s Costs. Except as provided in Section 3(b) below, the Tenant Allowance may not be applied against any costs associated with data cabling, telecommunication equipment installation, Tenant’s signage, or rent. The “Supervision Fee” shall be an amount equal to three percent (3%) of the total cost of installation and construction of the Tenant Improvements.

EXHIBIT B

8

(b) Landlord shall provide Tenant with an allowance of up to Three Hundred Eighty-One Thousand Seven Hundred Twenty and No/100 Dollars ($381,720.00) (“Tenant Allowance”) to be used toward payment of the costs incurred by Tenant for hard construction costs, permits, design and engineering fees, upgrades to the shell and core, Building mechanical, plumbing, HVAC, electrical, structural, and fire life safety systems, and Landlord’s Costs in connection with the Tenant Improvements. Tenant may apply up to Sixty-Three Thousand Six Hundred Twenty and No/100 Dollars ($63,620.00) of the Tenant Allowance for Tenant’s actual expenses for relocation/moving expenses, and data equipment and cabling installation in the 2013 Expansion Space. If Landlord reasonably anticipates that the Tenant Improvement costs may exceed the Tenant Allowance (such excess shall be referred to herein as the “Over Allowance Amount”), and there is an Over-Allowance Amount required to be paid by Tenant pursuant to this Section for such disbursement, Landlord shall only be required to make a disbursement equal to Landlord’s pro rata share thereof and simultaneously with each disbursement, Tenant will pay its pro rata share thereof. For purposes hereof, Landlord’s pro rata share for each such disbursement amount shall equal the percentage resulting from dividing the Tenant Allowance by the total cost of the Tenant Improvement costs (as may be revised from time to time), and Tenant’s pro rata share for each such disbursement amount shall equal the Over-Allowance Amount divided by such total cost of the Tenant Improvement costs. Landlord’s payment of such amounts shall not be deemed Landlord’s approval or acceptance of the work furnished or materials supplied as set forth in Tenant’s draw request. If Landlord reasonably estimates that there will be an Over Allowance Amount payable by Tenant, then Tenant shall pay Tenant’s pro rata share (as described above) of the Over-Allowance Amount directly to the Contractor during the construction of the Tenant Improvements as a condition precedent to Landlord’s obligation to disburse Landlord’s pro rata share of the Tenant Allowance. The Tenant Improvements must be completed, and Tenant must have submitted its request for reimbursement in accordance with the terms of this Paragraph 3, no later than July 1, 2014. If the cost of all items of the Tenant Improvements is less than the Tenant Allowance or if Tenant has not submitted its request for reimbursement for the entire Tenant Allowance in accordance with this Workletter by the foregoing deadline, Tenant shall not be entitled to any payment or credit for such excess or unused amount. Funds may be drawn against the Tenant Allowance at any time and from time to time prior to July 1, 2014, subject to the following:

(i) Tenant may not make more than one draw in any calendar month;

(ii) With each draw request, Tenant shall submit to Landlord the following documents:

(A) A true and correct copy of the application for payment by Tenant’s Contractors for the Tenant Improvements completed to date, including sworn statements evidencing the cost of the Tenant Improvements performed to date (or in the case of subcontractors and materialmen, sworn statements for the last preceding draw request) together with copies on all receipted bills and invoices;

EXHIBIT B

9

(B) Conditional or final lien waivers with respect to the Tenant Improvements performed to date from Tenant’s Contractors and any materialmen (or in the case of subcontractors and materialmen and except for the final disbursement of the Tenant Allowance, unconditional lien waivers for the last preceding draw request);

(C) Tenant’s certification to Landlord that the amounts set forth in all contractor’s sworn statements are owed to Tenant’s Contractors for the Tenant Improvements performed to date;

(D) The total cost of the Tenant Improvements based on the Final Plans, as such cost may change from time to time;

(E) With the final draw request, Tenant shall submit to Landlord a certificate from Tenant’s Architect stating that the Tenant Improvements has been completed in accordance with the Final Plans and applicable zoning, building, environmental and other laws and Unconditional Waiver and Release Upon Progress Payment from the General Contractor and each of Tenant’s Contractors who have not theretofore delivered such unconditional waiver and release.

(iii) Landlord will disburse the portion of the Tenant Allowance allocable to each draw request to Tenant or at Tenant’s request or at Landlord’s option directly to Tenant’s Contractors within thirty (30) days after Tenant has submitted the required information for such draw and has otherwise complied with the requirements hereof.

(c) Tenant shall pay for the Tenant Improvements and shall not permit the 2013 Expansion Space, Original Premises or Building or underlying property to become subject to any lien on account of labor, material, or services furnished to Tenant.

(d) In the event Landlord wrongfully fails to disburse any amount of the Tenant Allowance as required hereunder after Tenant has submitted all documents required hereunder with respect to such disbursement request and such failure continues for sixty (60) days after notice delivered to Landlord strictly in accordance with the Amendment, Tenant shall have the right to (i) disburse such unpaid amounts to the General Contractor and (ii) offset such amounts against Base Rent next due and owing (up to an amount not to exceed 20% of the then scheduled Base Rent amount in any month).

4. Miscellaneous.

(a) Tenant agrees that, in connection with the Tenant Improvements and its use of the 2013 Expansion Space prior to the 2013 Expansion Space Commencement Date, Tenant shall have those duties and obligations with respect thereto that it has pursuant to the Lease during the Term, except the obligation for payment of rent, and further agrees that Landlord shall not be liable in any way for injury, loss, or damage which may occur to any of the Tenant Improvements or installations made in the 2013 Expansion Space, or to any personal property placed therein, the same being at Tenant’s sole risk, except to the extent caused by the gross negligence or willful misconduct of Landlord or Landlord Parties.

EXHIBIT B

10

(b) Except as expressly set forth in the Amendment or the Lease, Landlord has no other agreement with Tenant and Landlord has no other obligation to do any other work or pay any amounts with respect to the 2013 Expansion Space. Any other work in the 2013 Expansion Space which may be permitted by Landlord pursuant to the terms and conditions of the Amendment shall be done at Tenant’s sole cost and expense and in accordance with the terms and conditions of the Lease.

(c) This Workletter shall not be deemed applicable to any additional space added to the Original Premises at any time or from time to time, whether by any options under the Amendment or otherwise, or to any portion of the Original Premises or any additions thereto in the event of a renewal or extension of the initial term of the Lease, whether by any options under the Lease or otherwise, unless expressly so provided in the Lease or any amendment or supplement thereto.

(d) The failure by Tenant to pay any monies due to Landlord pursuant to this Workletter within five (5) business days (or such longer period as expressly set forth herein) after notice from Landlord to Tenant shall be deemed an Event of Default under the terms of the Lease for which Landlord shall be entitled to exercise all remedies available to Landlord for nonpayment of Rent. All late payments shall bear interest pursuant to Section 18.04 of the Lease.

(e) Neither Landlord’s Agent nor the partners compromising Landlord or Landlord’s Agent, nor the shareholders (nor any of the partners comprising same), directors, officers, or shareholders of any of the foregoing (collectively, the “Parties”) shall be liable for the performance of Landlord’s obligations under this Workletter. Tenant shall look solely to Landlord to enforce Landlord’s obligations hereunder and shall not seek any damages against any of the Parties. The liability of Landlord for Landlord’s obligations under this Workletter shall not exceed and shall be limited to Landlord’s interest in the Building and Tenant shall not look to the property or assets of any of the Parties in seeking either to enforce Landlord’s obligations under this Workletter or to satisfy a judgment for Landlord’s failure to perform such obligations. Upon a sale of the Building by Landlord, if the buyer has assumed Landlord’s duties, obligations and liabilities hereunder, Tenant shall look solely to the buyer to enforce Tenant’s rights under this Workletter arising after the date of such sale.

EXHIBIT B

11

(f) Tenant shall be solely responsible to determine at the site all dimensions of the 2013 Expansion Space and the Building which affect any work to be performed by Tenant hereunder.

LANDLORD:	KNICKERBOCKER PROPERTIES, INC. XXXIII, a Delaware corporation
	By:	/s/ Karen M. Wilbrecht
		Karen M. Wilbrecht
		Its: Executive Director
TENANT:	MEDIVATION, INC., a Delaware corporation
	By:	/s/ Patrick Machado
	Its:	CFO & CBO
		Patrick Machado
	By:
	Its:

EXHIBIT B

12

SCHEDULE “B-1”

DESIGN STANDARDS

1. HVAC

a. Outside summer: 79 degrees FDB

b. Inside summer: 74 degrees + or - 2.5 degrees FDB (shades drawn)

c. Outside winter: 38 degrees FDB

d. Inside winter: 72 degrees FDB + or - 2.5 degrees FDB (shades drawn)

e. Population Density: One occupant per 150 usable square feet. The greater of 15 cfm outside air per occupant or 0.15 cfm outside air per usable square foot in accordance with Title 24 of the California Code of Regulations

2. Electrical

a. Subject to Title 24 of the California Code of Regulations, 1.5 watts per usable square foot connected load/lighting/power — 480/277 volts

b. Subject to Title 24 of the California Code of Regulations, 3.5 watts per usable square foot connected load/miscellaneous power — 120/208 volts

Total of 5 watts per usable square foot connected load

SCHEDULE B-1

1

EXHIBIT “C”

FORM OF LETTER OF CREDIT

EXHIBIT C

1

EX-12.1

Exhibit 12.1

Medivation, Inc.

Computation of Ratio of Earnings to Fixed Charges

(Unaudited)

(in thousands)

	Six  Months Ended June  30, 2013			Years Ended December 31,
				2012			2011			2010			2009			2008
Earnings
Net loss before income taxes	$	(32,003	)	$	(41,250	)	$	(43,172	)	$	(32,465	)	$	(46,481	)	$	(62,470	)
Fixed charges		11,037			16,985			933			733			933			200
Earnings, as defined	$	(20,966	)	$	(24,265	)	$	(42,239	)	$	(31,732	)	$	(45,548	)	$	(62,270	)
Fixed Charges
Interest expense	$	3,396		$	5,322		$	—		$	—		$	—		$	—
Amortization of debt discount and issuance costs		6,474			9,663			—			—			—			—
Interest component of rentals (1)		1,167			2,000			933			733			933			200
Total	$	11,037		$	16,985		$	933		$	733		$	933		$	200
Deficiency in earnings to cover fixed charges	$	32,003		$	41,250		$	43,172		$	32,465		$	46,481		$	62,470
Ratio of earnings to fixed charges			*			*			*			*			*			*

(1) Represents the estimated portion of operating lease rental expense that is considered by us to be a reasonable representation of interest.

* Because of the deficiency in earnings to cover fixed charges, the ratio information is not applicable.

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, David T. Hung, M.D., certify that:

1. I have reviewed this Form 10-Q of Medivation, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 8, 2013

/s/ David T. Hung, M.D.
Name:	David T. Hung, M.D.
Title:	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, C. Patrick Machado, certify that:

1. I have reviewed this Form 10-Q of Medivation, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 8, 2013

/s/ C. Patrick Machado
Name:	C. Patrick Machado
Title:	Chief Business Officer and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION

Pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. § 1350), David T. Hung, M.D., President and Chief Executive Officer of Medivation, Inc. (the “Company”), and C. Patrick Machado, Chief Business Officer and Chief Financial Officer of the Company, each hereby certifies that, to the best of his knowledge:

(1) The Company’s Quarterly Report on Form 10-Q for the period ended June 30, 2013, to which this Certification is attached as Exhibit 32.1 (the “Periodic Report”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Exchange Act; and

(2) The information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

In Witness Whereof, each of the undersigned has set his hand hereto as of the 8th day of August, 2013.

/s/ David T. Hung, M.D.		/s/ C. Patrick Machado
Name:	David T. Hung, M.D.	Name:	C. Patrick Machado
Title:	President and Chief Executive Officer	Title:	Chief Business Officer and Chief Financial Officer

This certification accompanies the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of Medivation, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2013

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 11 — COMMITMENTS AND CONTINGENCIES

(a) Operating Leases

In June 2013, the Company entered into the Fourth Amendment to its lease agreement, as amended, at 525 Market Street, San Francisco, California, pursuant to which it leased an additional approximately 13,000 square feet of office space that it expects to occupy beginning in January 2014. The Company is entitled to $0.4 million of tenant improvement allowances pursuant to the Fourth Amendment. In connection with the execution of the Fourth Amendment, the Company delivered to the lessor a letter of credit collateralized by restricted cash totaling $1.1 million. In total, at June 30, 2013, the Company leased approximately 98,000 square feet of office space at 525 Market Street pursuant to the lease agreement, as amended, which expires in June 2019. The Company has an option to extend the lease term for an additional five years.

The Company also leases approximately 15,000 square feet of office space in Oakbrook Terrace, Illinois for its commercial headquarters pursuant to a non-cancelable lease agreement that expires in December 2019, and utilizes approximately 14,000 square feet of laboratory space pursuant to an agreement that expires in December 2015.

The future minimum rentals under the Company’s non-cancelable operating leases at June 30, 2013 were as follows:

Years Ending December 31,	Annual Payments
2013 (remainder of year)	$	3,491
2014		7,772
2015		7,943
2016		6,250
2017		6,356
2018 and thereafter		9,832
Total	$	41,644

In addition to the future minimum rental payments included in the table above, certain lease agreements also require the Company to make additional payments during the lease term for taxes, insurance, and other operating expenses.

(b) Restricted Cash

The Company had outstanding letters of credit collateralized by restricted cash totaling $10.2 million and $9.2 million at June 30, 2013 and December 31, 2012, respectively, to secure various operating leases. At June 30, 2013, $0.3 million and $9.9 million of restricted cash associated with these letters of credit were classified as current and long-term assets, respectively, on the consolidated balance sheets. At December 31, 2012, $0.3 million and $8.8 million of restricted cash associated with these letters of credit were classified as current and long-term assets, respectively, on the consolidated balance sheets.

(c) License Agreement with UCLA

Under an August 2005 license agreement with UCLA, and subsequent amendments to this agreement, the Company’s subsidiary Medivation Prostate Therapeutics, Inc. holds an exclusive worldwide license under several UCLA patents and patent applications covering XTANDI and related compounds. Under the Astellas Collaboration Agreement, the Company granted Astellas a sublicense under the patent rights licensed to it by UCLA.

The Company is required to pay UCLA (a) an annual maintenance fee, (b) $2.8 million in aggregate milestone payments upon achievement of certain development and regulatory milestone events with respect to XTANDI (all of which has been paid as of June 30, 2013), (c) ten percent of the remaining $257.0 million in development milestone payments that the Company is eligible to earn under the Astellas Collaboration Agreement, and (d) a four percent royalty on global net sales of XTANDI. Under the terms of the Astellas Collaboration Agreement, the Company shares this royalty obligation with Astellas 50/50 with respect to sales in the United States, and Astellas bears this entire royalty obligation with respect to sales outside of the United States. In addition, in ongoing litigation initiated by the Company, UCLA has filed a cross-complaint alleging that the Company is also required to share with it ten percent of the $320.0 million in sales milestone payments that the Company is eligible to earn under the Astellas Collaboration Agreement. Additional information about this litigation is included below.

UCLA may terminate the agreement if the Company does not meet a general obligation to diligently proceed with the development, manufacturing and sale of licensed products, or if it commits any other uncured material breach of the agreement. The Company may terminate the agreement at any time upon advance written notice to UCLA. If neither party terminates the agreement early, the agreement will continue in force until the expiration of the last-to-expire patent.

(d) Litigation

The Company is party to legal proceedings, investigations, and claims in the ordinary course of its business, including the matters described below. The Company records accruals for outstanding legal matters when it believes that it is both probable that a liability has been incurred and the amount of such liability can be reasonably estimated. The Company evaluates, on a quarterly basis, developments in legal matters that could affect the amount of any accrual and developments that would make a loss contingency both probable and reasonably estimable. To the extent new information is obtained and the Company’s views on the probable outcomes of claims, suits, assessments, investigations or legal proceedings change, changes in the Company’s accrued liabilities would be recorded in the period in which such determination is made. For the matters described below, the liability is not probable or the amount cannot be reasonably estimated; and, therefore, accruals have not been made. In addition, in accordance with the relevant authoritative guidance, for matters for which the likelihood of material loss is at least reasonably possible, the Company provides disclosure of the possible loss or range of loss; however, if a reasonable estimate cannot be made, the Company will provide disclosure to that effect.

In March 2010, the first of several putative securities class action lawsuits was commenced in the U.S. District Court for the Northern District of California, naming as defendants the Company and certain of its officers. The lawsuits are largely identical and allege violations of the Securities Exchange Act of 1934, as amended. The plaintiffs allege, among other things, that the defendants disseminated false and misleading statements about the effectiveness of dimebon for the treatment of Alzheimer’s disease. The plaintiffs purport to seek damages, an award of their costs and injunctive relief on behalf of a class of stockholders who purchased or otherwise acquired the Company’s common stock between September 21, 2006 and March 2, 2010. The actions were consolidated in September 2010 and, in April 2011 the court entered an order appointing Catoosa Fund, L.P. and its attorneys as lead plaintiff and lead counsel. Thereafter, the lead plaintiff filed a consolidated amended complaint, which was dismissed without prejudice as to all defendants in August 2011. The lead plaintiff filed a second amended complaint in November 2011. In March 2012, the court dismissed the second amended complaint with prejudice and entered judgment in favor of defendants. Lead plaintiff filed a notice of appeal to the U.S. Circuit Court of Appeals for the Ninth Circuit in April 2012. The appeal is fully briefed, and the Company is awaiting notice of the date for oral argument.

In May 2011, the Company filed a lawsuit in San Francisco Superior Court against the Regents of the University of California, or the Regents, and one of its professors, alleging breach of contract and fraud claims, among others. The Company’s allegations in this lawsuit include that it has exclusive commercial rights to an investigational drug known as ARN-509, which is currently being developed by Aragon Pharmaceuticals, or Aragon. On June 17, 2013, Johnson & Johnson announced it entered into a definitive agreement with Aragon to acquire all ARN-509 assets currently owned by Aragon. ARN-509 is a close structural analog of XTANDI, was developed contemporaneously with XTANDI in the same academic laboratories in which XTANDI was developed, and was purportedly licensed by the Regents to Aragon, a company co-founded by the heads of the academic laboratories in which XTANDI was developed. On February 9, 2012, the Company filed a Second Amended Complaint, adding as additional defendants a former Regents professor and Aragon. The Company seeks remedies including a declaration that it is the proper licensee of ARN-509, contractual remedies conferring to it exclusive patent license rights regarding ARN-509, and other equitable and monetary relief. On August 7, 2012, the Regents filed a cross-complaint against the Company seeking declaratory relief which, if granted, would require the Company to share with the Regents 10% of any sales milestone payments the Company may receive under the Astellas Collaboration Agreement. Under the Astellas Collaboration Agreement, the Company is eligible to receive up to $320.0 million in sales milestone payments. On September 18, 2012, the trial court approved a settlement agreement dismissing the former Regents professor who was added to the case on February 9, 2012. On December 20, 2012 and January 25, 2013, the Court granted summary judgment motions filed by defendants Regents and Aragon, resulting in dismissal of all claims against Regents and Aragon, but denied such motions filed by the remaining Regents professor. On April 15, 2013, the Company filed a Notice of Appeal seeking appeal of the judgment in favor of Aragon. Medivation will file a Notice of Appeal of the summary judgment rulings in favor of Regents after the final judgment is entered on the Regent’s cross-complaint. The bench trial of the Regent’s cross-complaint against the Company was conducted in July 2013, and the Company is awaiting a decision from the Court. The jury trial of the Company’s fraud and breach of contract claims against the remaining Regents professor is scheduled to commence in October 2013.

While the Company believes it has meritorious positions with respect to the claims asserted against it and intends to advance its positions in these lawsuits vigorously, including on appeal, the process of resolving matters through litigation or other means is inherently uncertain, and it is not possible to predict the ultimate resolution of any such proceeding. The actual cost of defending the Company’s position may be significant, and the Company may not prevail. The Company believes it is entitled to coverage under its relevant insurance policies with respect to the putative securities class action lawsuits, subject to a $350,000 retention, but coverage could be denied or prove to be insufficient.

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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Collaboration revenue	$ 70,149	$ 42,912	$ 116,303	$ 79,737
Operating expenses:
Research and development expenses	28,205	21,550	53,113	41,580
Selling, general and administrative expenses	41,890	22,337	85,458	38,024
Total operating expenses	70,095	43,887	138,571	79,604
Income (loss) from operations	54	(975)	(22,268)	133
Other income (expense), net:
Interest expense	(4,982)	(4,688)	(9,870)	(5,273)
Interest income	52	56	126	83
Other income (expense), net	10	83	9	(15)
Total other income (expense), net	(4,920)	(4,549)	(9,735)	(5,205)
Net loss before income tax (expense) benefit	(4,866)	(5,524)	(32,003)	(5,072)
Income tax (expense) benefit	(32)	24	(65)	12
Net loss	$ (4,898)	$ (5,500)	$ (32,068)	$ (5,060)
Basic and diluted net loss per common share	$ (0.07)	$ (0.08)	$ (0.43)	$ (0.07)
Weighted average common shares used in the calculation of basic and diluted net loss per common share	75,013	72,770	74,919	72,339

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Net Income (Loss) Per Common Share

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Net Income (Loss) Per Common Share

NOTE 4 — NET INCOME (LOSS) PER COMMON SHARE

The computation of basic net income (loss) per common share is based on the weighted-average number of common shares outstanding during each period. The computation of diluted net income (loss) per common share is based on the weighted-average number of common shares outstanding during the period plus, when their effect is dilutive, incremental shares consisting of shares subject to stock options, restricted stock units, performance share awards, stock appreciation rights, warrants and shares issuable upon conversion of convertible debt.

In periods where the Company reported a net loss, all common stock equivalents and convertible securities are deemed anti-dilutive such that basic net loss per common share and diluted net loss per common share are equal.

In periods in which the Company has net income, it uses the “if-converted” method in calculating the diluted net income per common share effect of the assumed conversion of the Convertible Notes because they can be settled in stock, cash or a combination thereof. Under the “if -converted” method, interest expense related to the Convertible Notes is added back to net income, and the Convertible Notes are assumed to have been converted into common shares at the beginning of the period (or the issuance date) in periods in which there would be a dilutive effect.

Potentially dilutive common shares have been excluded from the diluted net loss per common share computations for the three and six months ended June 30, 2013 and 2012 because such securities have an anti-dilutive effect on net loss per common share due to the Company’s net loss during these periods. Outstanding securities, and the number of potentially dilutive common shares underlying such securities, were as follows:

	June 30,
	2013		2012
Stock options		7,049		7,348
Convertible Notes		5,050		5,050
Restricted stock units		446		250
Stock appreciation rights		442		—
Performance shares		—		84
Warrants		46		46
Total		13,033		12,778

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Fair Value Disclosures (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Cash, Cash Equivalents and Investments, as Well as Hierarchy for Financial Instruments Measured at Fair Value on Recurring Basis

The following table presents the Company’s cash equivalents and short-term investments, as well as the hierarchy for its financial instruments measured at fair value on a recurring basis:

			Fair value measurements using:
	Fair Value		Level 1		Level 2		Level 3
June 30, 2013:
Cash equivalents:
Money market funds	$	50,156	$	50,156		—		—
Short-term investments:
U.S. Treasury bills	$	144,956	$	144,956		—		—
December 31, 2012:
Cash equivalents:
Money market funds	$	48,693	$	48,693		—		—
Short-term investments:
U.S. Treasury bills	$	224,939	$	224,939		—		—

Fair Value of Other Financial Instruments Not Measured on Recurring Basis

In the table below, the Company has presented the fair value of other financial instruments that are not measured at fair value on a recurring basis.

			Fair value measurements using:
	Fair Value		Level 1		Level 2		Level 3
June 30, 2013:
Assets:
Bank deposits (included in “Cash and cash equivalents”)	$	50,831	$	50,831		—		—
Liabilities:
Convertible Notes	$	237,070		—	$	237,070		—
December 31, 2012:
Assets:
Bank deposits (included in “Cash and cash equivalents”)	$	22,608	$	22,608		—		—
Liabilities:
Convertible Notes	$	234,813		—	$	234,813		—

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Basis of Presentation

(a) Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States, or U.S. GAAP, for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The unaudited consolidated financial statements have been prepared on the same basis as the annual audited consolidated financial statements. In the opinion of management, all adjustments, consisting of normal recurring adjustments necessary for the fair statement of the Company’s financial condition, results of operations and cash flows for the periods presented, have been included. The results of operations of any interim period are not necessarily indicative of the results of operations for the full year or any other interim period.

The unaudited consolidated financial statements and related disclosures have been prepared with the presumption that users of the interim unaudited consolidated financial statements have read or have access to the audited consolidated financial statements for the preceding fiscal year. Accordingly, these unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the fiscal year ended December 31, 2012 included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012, or the Annual Report, filed with the U.S. Securities and Exchange Commission, or SEC, on February 28, 2013. The consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.

The unaudited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The Company operates in one operating segment.

All tabular disclosures of dollar and share amounts are presented in thousands, unless indicated otherwise. All per share amounts are presented at their actual amounts. The number of shares issuable under the Amended and Restated 2004 Equity Incentive Award Plan, or the Medivation Equity Incentive Plan, disclosed in Note 8, “Stockholder’s Equity,” are presented at their actual amounts. Amounts presented herein may not calculate or sum precisely due to rounding.

Use of Estimates

(b) Use of Estimates

The preparation of unaudited consolidated financial statements in accordance with U.S. GAAP requires that management make estimates and assumptions in certain circumstances that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Although management believes that these estimates are reasonable, actual future results could differ from those estimates. In addition, had different estimates and assumptions been used, the unaudited consolidated financial statements could have differed materially from what is presented.

Estimates and assumptions used by management principally relate to: revenue recognition, including estimates of the various deductions from gross sales used to calculate net sales of XTANDI, reliance on third-party information, and the estimated performance periods of the Company’s deliverables under the Astellas Collaboration Agreement and its former collaboration agreement with Pfizer; services performed by third parties but not yet invoiced; the fair value and forfeiture rates of equity awards under the Medivation Equity Incentive Plan and the probability of attaining the performance objectives of performance share awards; the probability and potential magnitude of contingent liabilities; Convertible Notes, including the Company’s estimate of how the net proceeds thereof should be bifurcated between the debt component and the equity component; and deferred income taxes, income tax provisions and accruals for uncertain income tax positions.

Capital Structure

(c) Capital Structure

On September 20, 2012, the Company filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation, as amended, effecting an increase in the total number of authorized shares of capital stock of the Company from 51,000,000 to 86,000,000 and an increase in the total number of authorized shares of common stock of the Company from 50,000,000 to 85,000,000.

On September 21, 2012, the Company filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation, as amended, effecting (i) an increase in the total number of authorized shares of capital stock of the Company from 86,000,000 to 171,000,000, (ii) an increase in the total number of authorized shares of common stock of the Company from 85,000,000 to 170,000,000, and (iii) a two-for-one forward split of its common stock effective as of 5:00 p.m., Eastern Time, on September 21, 2012.

The Company issued approximately 37.0 million shares of its common stock as a result of the two-for-one forward stock split. The par value of the Company’s common stock remained unchanged at $0.01 per share.

Information regarding shares of common stock (except par value per share), additional paid-in-capital, and net loss per common share for all periods presented reflects the two-for-one forward split of the Company’s common stock. The number of shares of the Company’s common stock issuable upon exercise of outstanding stock options and vesting of other stock-based awards was proportionally increased, and the exercise price per share thereof was proportionally decreased, in accordance with the terms of the Medivation Equity Incentive Plan. Following the completion of the two-for-one forward stock split, the conversion rate of the Company’s Convertible Notes was adjusted to 19.5172 shares of common stock per $1,000 principal amount of the Convertible Notes, equivalent to a conversion price of approximately $51.24 per share of common stock.

Significant Accounting Policies

(d) Significant Accounting Policies

Reference is made to Note 2, “Summary of Significant Accounting Policies,” included in the notes to the Company’s audited consolidated financial statements included in its Annual Report. As of the date of the filing of this Quarterly Report on Form 10-Q, or the Quarterly Report, there were no significant changes to the significant accounting policies described in the Company’s Annual Report.

Recently Issued Accounting Pronouncements

(e) Recently Issued Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2013-02, “Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income.” This amended guidance requires companies to provide enhanced footnote disclosures to explain the effect of reclassification adjustments out of other comprehensive income, or OCI, by component and provide tabular disclosure in the footnotes showing the effect of items reclassified from accumulated OCI on the line items of net income (loss). The Company adopted this amended guidance prospectively as of January 1, 2013. The adoption of this amended guidance did not have an impact on the Company’s consolidated financial position, results of operations or cash flows.

In July 2013, the FASB issued ASU No. 2013-11, “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists”. This update clarifies that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss, or NOL, carryforward, a similar tax loss, or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. In situations where an NOL carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction or the tax law of the jurisdiction does not require, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. This ASU is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. Retrospective application is permitted. The Company does not believe the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

Out-of-Period Adjustment

(f) Out-of-Period Adjustment

In the first quarter of 2013, the Company recorded an out-of-period correcting adjustment that increased operating expenses and net loss by $3.6 million for the three months ended March 31, 2013. Management concluded that the adjustment is not material to the expected full year 2013 results or any previously reported financial statements.

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Fair Value Disclosures - Cash, Cash Equivalents and Investments, as Well as Hierarchy for Financial Instruments Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair value [Member] | Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 50,156	$ 48,693
Fair value [Member] | U.S. Treasury bills [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. Treasury bills	144,956	224,939
Level 1 [Member] | Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	50,156	48,693
Level 1 [Member] | U.S. Treasury bills [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. Treasury bills	144,956	224,939
Level 2 [Member] | Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds
Level 2 [Member] | U.S. Treasury bills [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. Treasury bills
Level 3 [Member] | Money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds
Level 3 [Member] | U.S. Treasury bills [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. Treasury bills

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Property and Equipment, Net - Schedule of Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 19,891	$ 15,396
Less: Accumulated depreciation and amortization	(3,567)	(2,134)
Property and equipment, net	16,324	13,262
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,959	9,057
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,944	2,648
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,606	3,166
Laboratory equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	244	244
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 138	$ 281

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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended					6 Months Ended
	Sep. 21, 2012	Mar. 31, 2013	Jun. 30, 2013 Segment	Dec. 31, 2012	Jun. 30, 2013 Capital stock [Member]	Sep. 20, 2012 Capital stock [Member]	Dec. 31, 2011 Capital stock [Member]	Jun. 30, 2013 Common stock [Member]	Sep. 20, 2012 Common stock [Member]	Dec. 31, 2011 Common stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of operating business segment			1
Shares of capital stock authorized pre-split						86,000,000	51,000,000
Shares of common stock authorized pre-split									85,000,000	50,000,000
Shares of capital stock authorized					171,000,000
Total number of authorized shares			170,000,000	170,000,000				170,000,000
Forward stock split of common stock								2
Common stock issued in forward stock split			37,000,000
Par value of common stock			$ 0.01	$ 0.01
Debt instrument convertible increment of principal amount of conversion	$ 1,000		$ 1,000
Conversion rate of common stock, shares per principal amount	19.5172
Conversion price, per share of common stock	$ 51.24
Amount of net loss increased due to out-of-period adjustment		$ 3,600,000
Out of period adjustment		In the first quarter of 2013, the Company recorded an out-of-period correcting adjustment that increased operating expenses and net loss by $3.6 million for the three months ended March 31, 2013. Management concluded that the adjustment is not material to the expected full year 2013 results or any previously reported financial statements.

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Description of Business - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 2.625% convertible senior notes due 2017 [Member]	Jun. 30, 2012 2.625% convertible senior notes due 2017 [Member]
Debt Instrument [Line Items]
Cumulative net losses	$ (323,616)	$ (291,548)
Debt instrument, interest rate			2.625%	2.625%

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Stockholders' Equity - Schedule of Black-Scholes Assumptions Used for Stock Options and Stock Appreciations Rights (Detail) (Stock options [Member])	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	0.73%		0.73%	0.83%
Risk-free interest rate, maximum	1.55%		1.55%	1.01%
Risk-free interest rate		0.83%
Estimated term (in years)		5 years 5 months 1 day
Estimated volatility		71.00%
Estimated dividend yield
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated term (in years)	5 years 3 months		5 years 2 months 27 days	5 years 5 months 1 day
Estimated volatility	73.00%		68.00%	71.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated term (in years)	5 years 6 months		5 years 6 months	5 years 5 months 23 days
Estimated volatility	75.00%		75.00%	73.00%

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Collaboration Agreements - Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]
Deferred revenue, Current	$ 25,396	$ 33,862
Deferred revenue, Long-term		8,465
Astellas [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue, Current	25,396	33,862
Deferred revenue, Long-term		8,465
Total	$ 25,396	$ 42,327

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Stockholders' Equity - Additional Information (Detail) (USD $)	6 Months Ended				6 Months Ended				6 Months Ended
	Jun. 28, 2013	Jun. 30, 2013	Dec. 04, 2006	Jun. 30, 2013 Warrants [Member]	Jun. 30, 2013 Warrants [Member] Maximum [Member]	Jun. 30, 2013 Warrants [Member] Minimum [Member]	Jun. 30, 2013 Options granted [Member]	Jul. 13, 2012 Equity incentive plan [Member]	Jun. 30, 2013 Common stock [Member]	Jun. 28, 2013 Post-split basis [Member] Equity incentive plan [Member]	Jul. 13, 2012 Post-split basis [Member] Equity incentive plan [Member]	Jun. 28, 2013 Pre-split basis [Member] Equity incentive plan [Member]	Jul. 13, 2012 Pre-split basis [Member] Equity incentive plan [Member]	Jun. 30, 2013 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage before exercise			20.00%
Number of shares authorized for issuance								7,500,000		19,150,000	18,600,000	18,600,000	9,300,000
Forward stock split of common stock									2
Weighted-average grant-date fair value per share							$ 30.57
Warrants to purchase aggregate shares of common stock				45,808
Weighted-average exercise price of options, per share				3.46
Warrants expiration date					2017	2014
Unrecognized stock-based compensation expense		$ 77,200,000
Unrecognized stock-based compensation expense, weighted-average period for recognition (years)		2 years 9 months 18 days
Common stock authorized for issuance														3,000,000
Employees share purchase plan, fair market value of common stock at beginning of offering period	85.00%
Employees share purchase plan, fair market value of common stock at end of purchase period	85.00%
Eligible employee contributions	$ 25,000
Offering period	24 months

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Fair Value Disclosures - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Fair value, measurements, nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of the debt	$ 327,900,000
US Treasury notes securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities, debt maturities, period	September and December of 2013	March and June of 2013
Available-for-sale securities, amortized cost	144,900,000	224,900,000
Available-for-sale securities, gross unrealized gain (loss)	$ 0	$ 0

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Collaboration Agreements - Schedule of Collaboration Revenue (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Collaborative Arrangements [Line Items]
Attributable to ex-U.S. XTANDI sales	$ 500		$ 500
Total	70,149	42,912	116,303	79,737
U.S. XTANDI sales [Member]
Collaborative Arrangements [Line Items]
Attributable to U.S. XTANDI sales	41,201		78,890
Attributable to ex-U.S. XTANDI sales	482		482
Up-front cash payment arrangement [Member]
Collaborative Arrangements [Line Items]
Attributable to up-front and milestone payments	$ 28,466	$ 42,912	$ 36,931	$ 79,737

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Stockholders' Equity - Summary of Restricted Stock Units (Detail) (Restricted stock units [Member], USD $)	6 Months Ended
	Jun. 30, 2013
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested at December 31, 2012	373,625
Number of Shares, Granted	73,993
Number of Shares, Vested
Number of Shares, Forfeited	(1,856)
Number of Shares, Unvested at June 30, 2013	445,762
Weighted- Average Grant-Date Fair Value, Unvested at December 31, 2012	$ 39.06
Weighted- Average Grant-Date Fair Value, Granted	$ 50.94
Weighted- Average Grant-Date Fair Value, Vested
Weighted- Average Grant-Date Fair Value, Forfeited	$ 52.92
Weighted- Average Grant-Date Fair Value, Unvested at June 30, 2013	$ 40.98

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Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2013

Commitments And Contingencies Disclosure [Abstract]

Future Minimum Payments under Non-Cancelable Operating Leases

The future minimum rentals under the Company’s non-cancelable operating leases at June 30, 2013 were as follows:

Years Ending December 31,	Annual Payments
2013 (remainder of year)	$	3,491
2014		7,772
2015		7,943
2016		6,250
2017		6,356
2018 and thereafter		9,832
Total	$	41,644

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net loss	$ (32,068)	$ (5,060)
Adjustments for non-cash operating items:
Amortization of deferred revenue	(16,931)	(79,737)
Stock-based compensation	16,427	9,917
Amortization of debt discount and debt issuance costs	6,474	3,349
Depreciation on property and equipment	1,554	250
Accretion of discount on securities	(112)	(48)
Loss on disposal of equipment	35
Changes in operating assets and liabilities:
Receivable from collaboration partners	(28,861)	(1,956)
Prepaid expenses and other current assets	(3,733)	(1,982)
Other non-current assets	(1,383)	111
Accounts payable	1,871	314
Accrued expenses and other current liabilities	8,534	15,295
Interest payable		1,924
Other non-current liabilities	(137)	1,862
Net cash used in operating activities	(48,330)	(55,761)
Cash flows from investing activities:
Purchases of short-term investments	(144,926)	(199,914)
Maturities of short-term investments	225,000	75,000
Purchases of property and equipment	(4,651)	(5,825)
Change in restricted cash	(1,056)	(816)
Net cash provided by (used in) investing activities	74,367	(131,555)
Cash flows from financing activities:
Proceeds from issuance of Convertible Notes, net		250,987
Financing transaction costs		(614)
Proceeds from issuance of common stock under Medivation Equity Incentive Plan	3,649	11,326
Net cash provided by financing activities	3,649	261,699
Net increase in cash and cash equivalents	29,686	74,383
Cash and cash equivalents at beginning of period	71,301	70,136
Cash and cash equivalents at end of period	100,987	144,519
Non-cash investing activities:
Property and equipment expenditures incurred but not yet paid		$ 6,220

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

NOTE 2 — SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

(a) Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States, or U.S. GAAP, for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The unaudited consolidated financial statements have been prepared on the same basis as the annual audited consolidated financial statements. In the opinion of management, all adjustments, consisting of normal recurring adjustments necessary for the fair statement of the Company’s financial condition, results of operations and cash flows for the periods presented, have been included. The results of operations of any interim period are not necessarily indicative of the results of operations for the full year or any other interim period.

The unaudited consolidated financial statements and related disclosures have been prepared with the presumption that users of the interim unaudited consolidated financial statements have read or have access to the audited consolidated financial statements for the preceding fiscal year. Accordingly, these unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the fiscal year ended December 31, 2012 included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012, or the Annual Report, filed with the U.S. Securities and Exchange Commission, or SEC, on February 28, 2013. The consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.

The unaudited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The Company operates in one operating segment.

All tabular disclosures of dollar and share amounts are presented in thousands, unless indicated otherwise. All per share amounts are presented at their actual amounts. The number of shares issuable under the Amended and Restated 2004 Equity Incentive Award Plan, or the Medivation Equity Incentive Plan, disclosed in Note 8, “Stockholder’s Equity,” are presented at their actual amounts. Amounts presented herein may not calculate or sum precisely due to rounding.

(b) Use of Estimates

The preparation of unaudited consolidated financial statements in accordance with U.S. GAAP requires that management make estimates and assumptions in certain circumstances that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Although management believes that these estimates are reasonable, actual future results could differ from those estimates. In addition, had different estimates and assumptions been used, the unaudited consolidated financial statements could have differed materially from what is presented.

Estimates and assumptions used by management principally relate to: revenue recognition, including estimates of the various deductions from gross sales used to calculate net sales of XTANDI, reliance on third-party information, and the estimated performance periods of the Company’s deliverables under the Astellas Collaboration Agreement and its former collaboration agreement with Pfizer; services performed by third parties but not yet invoiced; the fair value and forfeiture rates of equity awards under the Medivation Equity Incentive Plan and the probability of attaining the performance objectives of performance share awards; the probability and potential magnitude of contingent liabilities; Convertible Notes, including the Company’s estimate of how the net proceeds thereof should be bifurcated between the debt component and the equity component; and deferred income taxes, income tax provisions and accruals for uncertain income tax positions.

(c) Capital Structure

On September 20, 2012, the Company filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation, as amended, effecting an increase in the total number of authorized shares of capital stock of the Company from 51,000,000 to 86,000,000 and an increase in the total number of authorized shares of common stock of the Company from 50,000,000 to 85,000,000.

On September 21, 2012, the Company filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation, as amended, effecting (i) an increase in the total number of authorized shares of capital stock of the Company from 86,000,000 to 171,000,000, (ii) an increase in the total number of authorized shares of common stock of the Company from 85,000,000 to 170,000,000, and (iii) a two-for-one forward split of its common stock effective as of 5:00 p.m., Eastern Time, on September 21, 2012.

The Company issued approximately 37.0 million shares of its common stock as a result of the two-for-one forward stock split. The par value of the Company’s common stock remained unchanged at $0.01 per share.

Information regarding shares of common stock (except par value per share), additional paid-in-capital, and net loss per common share for all periods presented reflects the two-for-one forward split of the Company’s common stock. The number of shares of the Company’s common stock issuable upon exercise of outstanding stock options and vesting of other stock-based awards was proportionally increased, and the exercise price per share thereof was proportionally decreased, in accordance with the terms of the Medivation Equity Incentive Plan. Following the completion of the two-for-one forward stock split, the conversion rate of the Company’s Convertible Notes was adjusted to 19.5172 shares of common stock per $1,000 principal amount of the Convertible Notes, equivalent to a conversion price of approximately $51.24 per share of common stock.

(d) Significant Accounting Policies

Reference is made to Note 2, “Summary of Significant Accounting Policies,” included in the notes to the Company’s audited consolidated financial statements included in its Annual Report. As of the date of the filing of this Quarterly Report on Form 10-Q, or the Quarterly Report, there were no significant changes to the significant accounting policies described in the Company’s Annual Report.

(e) Recently Issued Accounting Pronouncements

In February 2013, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2013-02, “Comprehensive Income (Topic 220): Reporting Amounts Reclassified Out of Accumulated Other Comprehensive Income.” This amended guidance requires companies to provide enhanced footnote disclosures to explain the effect of reclassification adjustments out of other comprehensive income, or OCI, by component and provide tabular disclosure in the footnotes showing the effect of items reclassified from accumulated OCI on the line items of net income (loss). The Company adopted this amended guidance prospectively as of January 1, 2013. The adoption of this amended guidance did not have an impact on the Company’s consolidated financial position, results of operations or cash flows.

In July 2013, the FASB issued ASU No. 2013-11, “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists.” This update clarifies that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss, or NOL, carryforward, a similar tax loss, or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. In situations where an NOL carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction or the tax law of the jurisdiction does not require, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. This ASU is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. Retrospective application is permitted. The Company does not believe the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

(f) Out-of-Period Adjustment

In the first quarter of 2013, the Company recorded an out-of-period correcting adjustment that increased operating expenses and net loss by $3.6 million for the three months ended March 31, 2013. Management concluded that the adjustment is not material to the expected full year 2013 results or any previously reported financial statements.

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Convertible Senior Notes Due 2017

6 Months Ended

Jun. 30, 2013

Debt Disclosure [Abstract]

Convertible Senior Notes Due 2017

NOTE 5 — CONVERTIBLE SENIOR NOTES DUE 2017

On March 19, 2012, the Company completed the sale of $258.8 million aggregate principal amount of Convertible Notes. The Convertible Notes are governed by an indenture, dated as of March 19, 2012 between the Company and Wells Fargo Bank, National Association as Trustee, as supplemented by the first supplemental indenture dated as of March 19, 2012, or the Indenture. The Convertible Notes bear interest at a rate of 2.625% per annum, payable semi-annually in arrears on April 1 and October 1 of each year, beginning on October 1, 2012. The Convertible Notes mature on April 1, 2017, unless earlier converted, redeemed or repurchased in accordance with their terms. The Convertible Notes are general senior unsecured obligations and rank (1) senior in right of payment to any of the Company’s future indebtedness that is expressly subordinated in right of payment to the Convertible Notes, (2) equal in right of payment to any of the Company’s future indebtedness and other liabilities of the Company that are not so subordinated, (3) junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness and (4) structurally junior to all future indebtedness incurred by the Company’s subsidiaries and their other liabilities (including trade payables).

Prior to April 6, 2015, the Convertible Notes are not redeemable. On or after April 6, 2015, the Company may redeem for cash all or a part of the Convertible Notes if the closing sale price of its common stock for 20 or more trading days in a period of 30 consecutive trading days ending on the trading day preceding the date it provides notice of the redemption exceeds 130% of the conversion price in effect on each such trading day, subject to certain conditions. The redemption price will equal 100% of the principal amount of the Convertible Notes to be redeemed plus accrued and unpaid interest, if any, to, but excluding the redemption date. If a fundamental change (as defined in the Indenture) occurs prior to the maturity date, holders may require the Company to purchase for cash all or any portion of the Convertible Notes at a purchase price equal to 100% of the principal amount of the Convertible Notes to be purchased plus accrued and unpaid interest, if any, to, but excluding, the fundamental change purchase date.

Holders may convert their Convertible Notes prior to the close of business on the business day immediately preceding January 1, 2017 only upon the occurrence of the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on June 30, 2012, if the closing sale price of the Company’s common stock, for at least 20 trading days (whether or not consecutive) in the period of 30 consecutive trading days ending on the last trading day of the calendar quarter immediately preceding the calendar quarter in which the conversion occurs, is more than 130% of the conversion price of the Convertible Notes in effect on each applicable trading day; (2) during the five consecutive trading-day period following any five consecutive trading-day period in which the trading price for the Convertible Notes for each such trading day was less than 98% of the closing sale price of the Company’s common stock on such date multiplied by the then-current conversion rate; (3) upon the occurrence of specified corporate events; or (4) if the Company calls any Convertible Notes for redemption, at any time until the close of business on the second business day preceding the redemption date. On or after January 1, 2017 until the close of business on the second business day immediately preceding the stated maturity date, holders may surrender their Convertible Notes for conversion at any time, regardless of the foregoing circumstances. At June 30, 2013, the Convertible Notes were not convertible.

Upon conversion of the Convertible Notes, the Company will pay or deliver, as the case may be, cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s election. The initial conversion rate was 9.7586 shares of common stock per $1,000 principal amount of the Convertible Notes, equivalent to a conversion price of approximately $102.47 per share of common stock. On September 21, 2012, following the completion of a two-for-one forward split of the Company’s common stock, the conversion rate was adjusted to 19.5172 shares of common stock per $1,000 principal amount of the Convertible Notes, equivalent to a conversion price of approximately $51.24 per share of common stock. The conversion rate is subject to adjustment in certain events, such as distribution of dividends and stock splits. In addition, upon a Make-Whole Adjustment Event (as defined in the Indenture), the Company will, under certain circumstances, increase the applicable conversion rate for a holder that elects to convert its Convertible Notes in connection with such Make-Whole Adjustment Event.

The debt and equity components of the Convertible Notes have been bifurcated and accounted for separately based on the authoritative accounting guidance in Accounting Standards Codification, or ASC, 470-20, “Debt with Conversion and Other Options.” The $258.8 million aggregate principal amount of Convertible Notes was bifurcated between the debt component ($187.1 million) and the equity component ($71.7 million). The amount allocated to the debt component of $187.1 million was estimated based on the fair value of similar debt instruments that do not include an equity conversion feature. The Convertible Notes were recorded at an initial carrying value of $187.1 million, net of $71.7 million in debt discount. The debt discount will be accreted to the carrying value of the Convertible Notes as non-cash interest expense utilizing the effective yield amortization method over the period ending on April 1, 2017, which is the scheduled maturity date of the Convertible Notes. Debt discount amortized during the three and six months ended June 30, 2013 was $3.0 million and $6.0 million, respectively. Debt discount amortized during the three and six months ended June 30, 2012 was $2.7 million and $3.1 million, respectively. At June 30, 2013, the carrying value of the Convertible Notes was $202.0 million, net of $56.8 million of unamortized debt discount.

The Company incurred issuance costs of $8.4 million, consisting primarily of investment banking, legal and other professional fees. These issuance costs were allocated to the debt component ($6.1 million) and the equity component ($2.3 million) in proportion to the allocation of the Convertible Note proceeds. The $6.1 million of issuance costs allocated to the debt component was capitalized and is being amortized as non-cash interest expense utilizing the effective yield amortization method over the period ending on the scheduled maturity date of the Convertible Notes. The $2.3 million of issuance costs allocated to the equity component was charged to additional paid-in capital.

After giving effect to the bifurcation described above, the effective interest rate on the Convertible Notes was 10.71% for the three and six months ended June 30, 2013 and 2012. The Company recognized total interest expense of $5.0 million and $9.9 million for the three and six months ended June 30, 2013, respectively, consisting of $1.7 million and $3.4 million of interest expense, respectively, based on the 2.625% coupon rate of the Convertible Notes and $3.3 million and $6.5 million of non-cash interest expense, respectively, related to the amortization of the debt discount and debt issuance costs. The Company recognized total interest expense of $4.7 million and $5.3 million for the three and six months ended June 30, 2012, respectively, consisting of $1.7 and $1.9 million of interest expense, respectively, based on the 2.625% coupon rate of the Convertible Notes and $3.0 million and $3.4 million of non-cash interest expense, respectively, related to the amortization of the debt discount and debt issuance costs

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Collaboration Agreements

6 Months Ended

Jun. 30, 2013

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Collaboration Agreements

NOTE 3 — COLLABORATION AGREEMENTS

(a) Collaboration Agreement with Astellas

In October 2009, the Company entered into the Astellas Collaboration Agreement pursuant to which it is collaborating with Astellas to develop and commercialize XTANDI globally. Under the agreement, decision making and economic participation differs between the U.S. market and the ex-U.S. market. In the United States, decisions are generally made by consensus, pre-tax profits and losses are shared equally, and, subject to certain exceptions, development and commercialization costs (including cost of goods sold and the royalty on net sales payable to The Regents of the University of California, or UCLA, under the Company’s license agreement with UCLA) are also shared equally. The primary exceptions to equal cost sharing in the U.S. market are that each party bears its own commercial full-time equivalent, or FTE, costs, and that development costs supporting regulatory approvals in both the United States and either Europe or Japan are borne one-third by the Company and two-thirds by Astellas. The Company and Astellas are co-promoting XTANDI in the U.S. market, with each company providing half of the sales and medical affairs effort in support of the product. Both the Company and Astellas are entitled to receive a fee for each qualifying detail made by its respective sales representatives. Outside the United States, decisions are generally made by Astellas and all development and commercialization costs (including cost of goods sold and the royalty on net sales payable to UCLA) are borne by Astellas. Astellas retains all ex-U.S. profits and losses, and pays the Company a tiered royalty ranging from the low teens to the low twenties on any aggregate net sales of XTANDI outside the United States, or ex-U.S. XTANDI sales. Astellas has sole responsibility for promoting XTANDI outside the United States, and for recording all XTANDI sales both inside and outside the United States. Both the Company and Astellas have agreed not to commercialize certain other products having a similar mechanism of action as XTANDI for the treatment of specified indications for a specified time period, subject to certain exceptions.

Under the Astellas Collaboration Agreement, Astellas paid the Company a non-refundable, up-front cash payment of $110.0 million in the fourth quarter of 2009. The Company is also eligible to receive up to $335.0 million in development milestone payments, plus up to an additional $320.0 million in sales milestone payments. As of June 30, 2013, the Company had received an aggregate of $63.0 million in development milestone payments under the Astellas Collaboration Agreement. In addition, at June 30, 2013, a $15.0 million development milestone payment was included in “receivable from collaboration partner” on the accompanying unaudited consolidated balance sheet. This development milestone payment was received during the third quarter of 2013. The Company expects that any of the remaining $257.0 million in development milestone payments and the $320.0 million in sales milestone payments that the Company may earn in future periods will be recognized as revenue in their entirety in the period in which the underlying milestone event is achieved.

The remaining $257.0 million in development milestone payments the Company is eligible to receive under the Astellas Collaboration Agreement are as follows:

Milestone Event	4th line prostate  cancer patients (1)			3rd line prostate  cancer patients (2)		2nd line prostate  cancer patients (3) (4)
First acceptance for filing of a marketing application in:
The U.S.			(5)	$	10 million	$	15 million
The first major country in Europe			(5)	$	5 million	$	10 million
Japan			(5)	$	5 million	$	10 million
First approval of a marketing application in:
The U.S.			(5)	$	30 million	$	60 million
The first major country in Europe			(5)	$	15 million	$	30 million
Japan	$	15 million		$	15 million	$	30 million

⁽¹⁾  Defined as prostate cancer patients who meet each of the following three criteria: (a) prior treatment failure on either (i) one or more luteinizing hormone-releasing hormone, or LHRH, analog drugs or (ii) surgical castration; (b) prior treatment failure on one or more androgen receptor antagonist drugs; and (c) prior treatment failure on chemotherapy.

⁽²⁾  Defined as prostate cancer patients who meet each of the following three criteria: (a) prior treatment failure on either (i) one or more LHRH analog drugs or (ii) surgical castration; (b) prior treatment failure on one or more androgen receptor antagonist drugs; and (c) no prior exposure to chemotherapy for prostate cancer.

⁽³⁾  Defined as prostate cancer patients who meet each of the following two criteria: (a) prior treatment failure on either (i) one or more LHRH analog drugs or (ii) surgical castration; and (b) no prior treatment failure on one or more androgen receptor antagonist drugs.

⁽⁴⁾  An additional milestone payment of $7.0 million is payable upon the first to occur of: (a) first approval of a marketing application in the United States with a label encompassing 2nd line prostate cancer patients; (b) first approval of a marketing application in the first major country in Europe with a label encompassing 2nd line prostate cancer patients; (c) first approval of a marketing application in Japan with a label encompassing 2nd line prostate cancer patients; or (d) first patient dosed in a Phase 3 clinical trial other than the PREVAIL trial that is designed specifically to support receipt of marketing approval in 2nd line patients.

⁽⁵⁾  These milestone payments totaling $78.0 million have been previously earned and payments totaling $63.0 million had been received as of June 30, 2013. A $15.0 million milestone payment, which was included in “receivable from collaboration partner” on the accompanying unaudited consolidated balance sheet at June 30, 2013, was received during the third quarter of 2013.

Under the Company’s license agreement with UCLA, and subsequent amendments to this agreement, the Company is required to share with UCLA ten percent of the development milestone payments that the Company earns under the Astellas Collaboration Agreement. In ongoing litigation with UCLA initiated by the Company, UCLA has alleged in a cross-complaint that the Company is also required to share with UCLA ten percent of any sales milestone payments the Company may receive under the Astellas Collaboration Agreement. The Company disputes this allegation, and intends to defend its position vigorously. For more information about this litigation, see Note 11, “Commitments and Contingencies.”

The Company and Astellas are each permitted to terminate the Astellas Collaboration Agreement for an uncured material breach by the other party or for the insolvency of the other party. Astellas has a right to terminate the Astellas Collaboration Agreement unilaterally by advance written notice to the Company, but, except in certain specified circumstances, generally cannot exercise that termination right until the first anniversary of XTANDI’s first commercial sale. Following any termination of the Astellas Collaboration Agreement in its entirety, all rights to develop and commercialize XTANDI will revert to the Company, and Astellas will grant a license to the Company to enable it to continue such development and commercialization. In addition, except in the case of a termination by Astellas for the Company’s material breach, Astellas will supply XTANDI to the Company during a specified transition period.

Unless terminated earlier by the Company or Astellas pursuant to the terms thereof, the Astellas Collaboration Agreement will remain in effect: (a) in the United States, until such time as Astellas notifies the Company that Astellas has permanently stopped selling products covered by the Astellas Collaboration Agreement in the United States; and (b) in each other country of the world, on a country-by-country basis, until such time as (i) products covered by the Astellas Collaboration Agreement cease to be protected by patents or regulatory exclusivity in such country and (ii) commercial sales of generic equivalent products have commenced in such country.

(b) Former Collaboration Agreement with Pfizer

The Company entered into a collaboration agreement with Pfizer in October 2008. Under the terms of the agreement, the Company and Pfizer agreed to collaborate on the development and commercialization of its former product candidate dimebon for the treatment of Alzheimer’s disease and Huntington disease for the U.S. market. Pfizer paid the Company a non-refundable, up-front cash payment of $225.0 million in the fourth quarter of 2008. Under the terms of the former collaboration agreement with Pfizer, the Company and Pfizer shared the costs and expenses of developing and commercializing dimebon for the U.S. market on a 60%/40% basis, with Pfizer assuming the larger share. In January 2012, Pfizer exercised its right to terminate the collaboration agreement and the Company and Pfizer discontinued development of dimebon for all indications due to the negative Phase 3 trial results in both indications.

(c) Collaboration Revenue

Collaboration revenue consists of three components: (a) collaboration revenue attributable to U.S. XTANDI sales; (b) collaboration revenue attributable to ex-U.S. XTANDI sales; and (c) collaboration revenue attributable to up-front and milestone payments.

Collaboration revenue was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Collaboration revenue:
Attributable to U.S. XTANDI sales	$	41,201	$	—	$	78,890	$	—
Attributable to ex-U.S. XTANDI sales		482		—		482		—
Attributable to up-front and milestone payments		28,466		42,912		36,931		79,737
Total	$	70,149	$	42,912	$	116,303	$	79,737

Collaboration Revenue Attributable to U.S. XTANDI Sales

Under the Astellas Collaboration Agreement, Astellas records all U.S. XTANDI sales. The Company and Astellas share equally all pre-tax profits and losses from U.S. XTANDI sales. Subject to certain exceptions, the Company and Astellas also share equally all XTANDI development and commercialization costs attributable to the U.S. market, including cost of goods sold and the royalty on net sales payable to UCLA under the Company’s license agreement with UCLA. The primary exceptions to 50/50 cost sharing are that each party bears its own commercial FTE costs and that development costs supporting regulatory approvals in both the United States and either Europe or Japan are borne one-third by the Company and two-thirds by Astellas. The Company recognizes collaboration revenue attributable to U.S. XTANDI sales in the period in which such sales occur. Collaboration revenue attributable to U.S. XTANDI sales consists of the Company’s share of pre-tax profits and losses from U.S. sales, plus reimbursement of the Company’s share of reimbursable U.S. development and commercialization costs. The Company’s collaboration revenue attributable to U.S. XTANDI sales in any given period will be mathematically equal to 50% of U.S. XTANDI net sales as reported by Astellas for the applicable period.

Collaboration revenue attributable to U.S. XTANDI sales was as follows:

	Three Months Ended June 30, 2013			Six Months Ended June 30, 2013
Net U.S. sales (as reported by Astellas)	$	82,402		$	157,780
Shared U.S. development and commercialization costs		(61,431	)		(119,101	)
Pre-tax U.S. profit	$	20,971		$	38,679
Medivation’s share of pre-tax U.S. profit	$	10,486		$	19,340
Reimbursement of Medivation’s share of shared U.S. costs		30,715			59,550
Collaboration revenue attributable to U.S. XTANDI sales	$	41,201		$	78,890

XTANDI first became available for shipment on September 13, 2012. There was no collaboration revenue attributable to U.S. XTANDI sales for the three and six months ended June 30, 2012.

Collaboration Revenue Attributable to Ex-U.S. XTANDI Sales

Under the Astellas Collaboration Agreement, Astellas records all ex-U.S. XTANDI sales. Astellas is responsible for all development and commercialization costs for XTANDI outside the United States, including cost of goods sold and the royalty on net sales payable to UCLA under the Company’s license agreement with UCLA, and pays the Company a tiered royalty ranging from the low teens to the low twenties on net ex-U.S. XTANDI sales. The Company recognizes collaboration revenue attributable to ex-U.S. XTANDI sales in the period in which such sales occur. Collaboration revenue attributable to ex-U.S. XTANDI sales consists of royalty payments from Astellas on those sales.

Collaboration revenue attributable to ex-U.S. XTANDI sales was $0.5 million for the three and six months ended June 30, 2013. There was no collaboration revenue attributable to ex-U.S. XTANDI sales for the three and six months ended June 30, 2012.

Collaboration Revenue Attributable to Up-front and Milestone Payments

The Company records non-refundable, up-front payments under its current and former collaboration agreements as deferred revenue and recognizes these payments as collaboration revenue on a straight-line basis over the applicable estimated performance period. The Company’s performance period under the Astellas Collaboration Agreement began in the fourth quarter of 2009 and at June 30, 2013, management estimated that it would be completed in the first quarter of 2014. The Company’s performance period under its former collaboration agreement with Pfizer concluded in the third quarter of 2012 upon completion of the Company’s performance obligations.

The Company is eligible to receive milestone payments under the Astellas Collaboration Agreement based on the achievement of specified development, regulatory and commercial events. Management evaluated the nature of the events triggering these contingent payments, and concluded that these events fall into two categories: (a) events which involve the performance of the Company’s obligations under the Astellas Collaboration Agreement, and (b) events which do not involve the performance of the Company’s obligations under the Astellas Collaboration Agreement.

The former category of milestone payments consists of those triggered by development and regulatory activities in the United States and by the acceptance for review of marketing applications in Europe and Japan. Management concluded that each of these payments, with one exception, constitute substantive milestones. This conclusion was based primarily on the facts that (i) each triggering event represents a specific outcome that can be achieved only through successful performance by the Company of one or more of its deliverables, (ii) achievement of each triggering event was subject to inherent risk and uncertainty and would result in additional payments becoming due to the Company, (iii) each of the milestone payments is non-refundable, (iv) substantial effort is required to complete each milestone, (v) the amount of each milestone payment is reasonable in relation to the value created in achieving the milestone, (vi) a substantial amount of time is expected to pass between the up-front payment and the potential milestone payments, and (vii) the milestone payments relate solely to past performance. Based on the foregoing, the Company recognizes any revenue from these milestone payments in the period in which the underlying triggering event occurs. The one exception is the milestone payment for initiation of the Phase 3 PREVAIL trial, an event which management deemed to be reasonably assured at the inception of the Astellas collaboration. This milestone payment was triggered in the third quarter of 2010, and the Company is recognizing the milestone payment as revenue on a straight-line basis over the estimated performance period of the Astellas Collaboration Agreement.

The latter category of milestone payments consists of those triggered by potential regulatory approvals in Europe and Japan, and commercial activities globally, all of which are areas in which the Company has no pertinent contractual responsibilities under the Astellas Collaboration Agreement. Management concluded that these payments constitute contingent revenues and thus recognizes them as revenue in the period in which the contingency is met.

Through June 30, 2013, the Company has received an aggregate of $173.0 million of payments from Astellas, consisting of an up-front payment of $110.0 million and development milestone payments of $63.0 million, and a $225.0 million up-front payment under its former collaboration agreement with Pfizer. In addition, at June 30, 2013, a development milestone of $15.0 million was earned under the Astellas Collaboration Agreement and is included in collaboration revenue for the three and six months ended June 30, 2013. This amount is included in “receivable from collaboration partner” on the accompanying unaudited consolidated balance sheet at June 30, 2013 and was received during the third quarter of 2013.

Collaboration revenue attributable to up-front and milestone payments was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Collaboration revenue attributable to up-front and milestone payments:
From Astellas	$	28,466	$	7,256	$	36,931	$	13,193
From Pfizer		—		35,656		—		66,544
Total	$	28,466	$	42,912	$	36,931	$	79,737

Deferred revenue under the Astellas Collaboration Agreement consisted of the following:

	June 30, 2013		December 31, 2012
Current	$	25,396	$	33,862
Long-term		—		8,465
Total	$	25,396	$	42,327

(d) Cost-Sharing Payments

Under both the Astellas Collaboration Agreement and the former collaboration agreement with Pfizer, the Company and its collaboration partners share certain development and commercialization costs (including in the case of the Astellas Collaboration Agreement, cost of goods sold and the royalty on net sales payable to UCLA under the Company’s license agreement with UCLA) in the United States. The parties make quarterly cost-sharing payments to one another in amounts necessary to ensure that each party bears its contractual share of the overall shared U.S. development and commercialization costs incurred. The Company’s policy is to account for cost-sharing payments to its collaboration partners as increases in expense in its consolidated statements of operations, while cost-sharing payments by its collaboration partners to the Company are accounted for as reductions in expense. Cost-sharing payments related to development activities and commercialization activities are recorded in research and development, or R&D, expenses, and selling, general and administrative, or SG&A, expenses, respectively.

The following table summarizes the reductions in R&D expenses related to development cost-sharing payments:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Development cost-sharing payments from Astellas	$	11,309	$	14,013	$	18,547	$	28,128
Development cost-sharing payments from Pfizer		—		362		—		1,689
Total	$	11,309	$	14,375	$	18,547	$	29,817

The following table summarizes the (increases) reductions in SG&A expenses related to commercialization cost-sharing payments:

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Commercialization cost-sharing payments (to) from Astellas	$	(3,791	)	$	146	$	(8,576	)	$	(670	)
Commercialization cost-sharing payments from Pfizer		—			5		—			9
Total	$	(3,791	)	$	151	$	(8,576	)	$	(661	)

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Stockholders' Equity - Summary of Stock Option Activity (Detail) (Stock options [Member], USD $)	6 Months Ended
	Jun. 30, 2013
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding at December 31, 2012	7,038,291
Number of Options, Granted	337,606
Number of Options, Exercised	(308,914)
Number of Options, Forfeited	(18,104)
Number of Options, Outstanding at June 30, 2013	7,048,879
Number of Options, Vested and exercisable at June 30, 2013	4,093,583
Weighted Average Exercise Price, Outstanding at December 31, 2012	$ 18.90
Weighted Average Exercise Price, Granted	$ 49.75
Weighted Average Exercise Price, Exercised	$ 11.82
Weighted Average Exercise Price, Forfeited	$ 35.56
Weighted Average Exercise Price, Outstanding at June 30, 2013	$ 20.65
Weighted Average Exercise Price, Vested and exercisable at June 30, 2013	$ 11.67
Weighted Average Remaining Contractual Term (in years), Outstanding at June 30, 2013	6 years 11 months 12 days
Weighted Average Remaining Contractual Term (in years), Vested and exercisable at June 30, 2013	5 years 8 months 19 days
Aggregate Intrinsic Value, Outstanding at June 30, 2013	$ 205.8
Aggregate Intrinsic Value, Vested and exercisable at June 30, 2013	$ 153.6

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Collaboration Agreements - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended			3 Months Ended		6 Months Ended				3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2013 Collaborative agreement [Member]	Jun. 30, 2013 Collaborative agreement [Member] Astellas [Member]	Dec. 31, 2009 Up-front cash payment arrangement [Member] Astellas [Member]	Dec. 31, 2008 Up-front cash payment arrangement [Member] Pfizer [Member]	Jun. 30, 2013 Development milestone payments [Member] Astellas [Member]	Jun. 30, 2013 Development milestone payments [Member] Astellas [Member]	Jun. 30, 2013 Sales milestone payments [Member] Astellas [Member]	Jun. 30, 2013 Development cost-sharing payments [Member] Collaborative agreement [Member] Astellas [Member]	Dec. 31, 2008 Development cost-sharing payments [Member] Collaborative agreement [Member] Pfizer [Member]	Jun. 30, 2013 Development cost-sharing payments [Member] Collaborative agreement [Member] Pfizer [Member]	Jun. 30, 2013 Commercial cost sharing-payments [Member] Collaborative agreement [Member] Astellas [Member]	Dec. 31, 2008 Commercial cost sharing-payments [Member] Collaborative agreement [Member] Medivation [Member]	Jun. 30, 2013 Commercial cost sharing-payments [Member] Collaborative agreement [Member] Medivation [Member]
Deferred Revenue Arrangement [Line Items]
Co-promotion of sales and medical affairs percentage			50.00%
Royalty received on ex-U.S. sales per collaboration arrangement				low teens to the low twenties
Non-refundable, up-front cash payment					$ 110,000,000	$ 225,000,000
Eligible to receive milestone payments							335,000,000
Eligible to receive milestone payments									320,000,000
Astellas development milestones received		63,000,000					63,000,000
Receivable from collaboration partner								15,000,000
Remaining development milestone payments the Company is eligible to receive								257,000,000
Percentage share of development milestone payments							10.00%	10.00%
Share percentage of developing and commercializing dimebon											60.00%	60.00%		40.00%	40.00%
Share of developing and commercializing XTANDI U.S.										50.00%			50.00%
Share of developing and commercializing XTANDI ex-U.S.										33.33%			66.67%
Collaboration revenue percentage compared to U.S. XTANDI net sales	50.00%	50.00%
Collaboration revenue attributable to ex-U.S. XTANDI sales	500,000	500,000
Aggregate upfront and milestones received			$ 173,000,000

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Collaboration Agreements - Schedule of Collaboration Revenue Attributable to Sales (Detail) (U.S. XTANDI sales [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Collaborative Arrangements [Line Items]
Shared U.S. development and commercialization costs	$ (61,431)	$ (119,101)
Pre-tax U.S. profit	20,971	38,679
Collaboration revenue attributable to U.S. XTANDI sales	41,201	78,890
Astellas [Member]
Collaborative Arrangements [Line Items]
Net U.S. sales (as reported by Astellas)	82,402	157,780
Medivation [Member]
Collaborative Arrangements [Line Items]
Medivation's share of pre-tax U.S. profit	10,486	19,340
Reimbursement of Medivation's share of shared U.S. costs	$ 30,715	$ 59,550

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Convertible Senior Notes Due 2017 - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 21, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Sep. 21, 2012	Jun. 30, 2012	Dec. 31, 2012
Long Term Debt [Line Items]
Debt instrument, offering date				Mar. 19, 2012
Convertible Notes, maturity date				Apr. 01, 2017
Convertible Notes, payment terms				The Convertible Notes bear interest at a rate of 2.625% per annum, payable semi-annually in arrears on April 1 and October 1 of each year, beginning on October 1, 2012.
Convertible Notes, aggregate principal amount		$ 258,800,000		$ 258,800,000
Maximum percentage of conversion price upon redemption of Convertible Notes				130.00%
Percentage of redemption price to principal amount of note				100.00%
Convertible Notes, conversion term description				(1) during any calendar quarter commencing after the calendar quarter ending on June 30, 2012, if the closing sale price of the Company’s common stock, for at least 20 trading days (whether or not consecutive) in the period of 30 consecutive trading days ending on the last trading day of the calendar quarter immediately preceding the calendar quarter in which the conversion occurs, is more than 130% of the conversion price of the Convertible Notes in effect on each applicable trading day; (2) during the five consecutive trading-day period following any five consecutive trading-day period in which the trading price for the Convertible Notes for each such trading day was less than 98% of the closing sale price of the Company’s common stock on such date multiplied by the then-current conversion rate; (3) upon the occurrence of specified corporate events; or (4) if the Company calls any Convertible Notes for redemption, at any time until the close of business on the second business day preceding the redemption date. On or after January 1, 2017 until the close of business on the second business day immediately preceding the stated maturity date, holders may surrender their Convertible Notes for conversion at any time, regardless of the foregoing circumstances. At June 30, 2013, the Convertible Notes were not convertible.
Debt instrument convertible conversion ratio presplit					9.7586
Debt instrument convertible increment of principal amount of conversion	1,000			1,000
Debt instrument convertible conversion price1 presplit	$ 102.47				$ 102.47
Conversion rate of common stock, shares per principal amount	19.5172
Conversion price, per share of common stock	$ 51.24				$ 51.24
Amortization of debt discount		3,000,000	2,700,000	6,000,000		3,100,000
Convertible notes, net of unamortized discount		201,976,000		201,976,000			196,007,000
Recognized debt discount		56,774,000		56,774,000			62,743,000
Issuance costs				8,400,000
Convertible Notes, issuance costs allocated to equity component				2,300,000
Convertible Notes, issuance costs allocated to debt component				6,100,000
Interest expense on Convertible Notes		4,982,000	4,688,000	9,870,000		5,273,000
2.625% convertible senior notes due 2017 [Member]
Long Term Debt [Line Items]
Debt instrument, interest rate		2.625%	2.625%	2.625%		2.625%
Debt instrument, effective percentage rate		10.71%	10.71%	10.71%		10.71%
Interest expense on Convertible Notes		5,000,000	4,700,000	9,900,000		5,300,000
Cash interest expenses		1,700,000	1,700,000	3,400,000		1,900,000
Non-cash interest expense		3,300,000	3,000,000	6,500,000		3,400,000
Equity component [Member]
Long Term Debt [Line Items]
Convertible Notes, equity component		71,700,000		71,700,000
Debt component [Member]
Long Term Debt [Line Items]
Debt instrument convertible debt equity component				$ 187,100,000
Common stock [Member]
Long Term Debt [Line Items]
Forward stock split of common stock				2

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Fair Value Disclosures - Fair Value of Other Financial Instruments Not Measured on Recurring Basis (Detail) (Fair value, measurements, nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Convertible Notes	$ 327,900
Fair value [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Bank deposits (included in "Cash and cash equivalents")	50,831	22,608
Convertible Notes	237,070	234,813
Level 1 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Bank deposits (included in "Cash and cash equivalents")	50,831	22,608
Convertible Notes
Level 2 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Bank deposits (included in "Cash and cash equivalents")
Convertible Notes	237,070	234,813
Level 3 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Bank deposits (included in "Cash and cash equivalents")
Convertible Notes

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Stockholders' Equity - Summary of Stock Appreciation Rights Activity (Parenthetical) (Detail) (Stock appreciation rights [Member], USD $)	Jun. 28, 2013
Stock appreciation rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing stock price of common stock	$ 49.20

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Convertible Notes, discount	$ 56,774	$ 62,743
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	170,000,000	170,000,000
Common stock, shares issued	75,095,615	74,774,939
Common stock, shares outstanding	75,095,615	74,774,939

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Stockholders' Equity

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Stockholders' Equity

NOTE 8 — STOCKHOLDERS’ EQUITY

(a) Stock Purchase Rights

All shares of the Company’s common stock, if issued prior to the termination by the Company of its rights agreement, dated as of December 4, 2006, include stock purchase rights. The rights are exercisable only if a person or group acquires twenty percent or more of the Company’s common stock or announces a tender or exchange offer which would result in ownership of twenty percent or more of the Company’s common stock. Following the acquisition of twenty percent or more of the Company’s common stock, the holders of the rights, other than the acquiring person or group, may purchase Medivation common stock at half of its fair market value. In the event of a merger or other acquisition of the Company, the holders of the rights, other than the acquiring person or group, may purchase shares of the acquiring entity at half of their fair market value. The rights were not exercisable at June 30, 2013.

(b) Medivation Equity Incentive Plan

The Medivation Equity Incentive Plan, which is stockholder-approved, provides for the issuance of options and other stock-based awards, including restricted stock units, performance share awards and stock appreciation rights. The Medivation Equity Incentive Plan is administered by the Board, or a committee appointed by the Board, which determines recipients and types of awards to be granted, including the number of shares subject to the awards, the exercise price and the vesting schedule. The vesting of all outstanding awards under the Medivation Equity Incentive Plan, including all outstanding options, restricted stock units, performance share awards and stock appreciation rights will accelerate, and all such share awards will become immediately exercisable, upon a “change of control” of Medivation, as defined in the Medivation Equity Incentive Plan.

On July 13, 2012, the Company’s stockholders approved an amendment and restatement of the Medivation Equity Incentive Plan to increase the aggregate number of shares of common stock authorized for issuance under the Medivation Equity Incentive Plan from 7,500,000 to 9,300,000. As a result of the two-for-one forward stock split described previously, the number of shares of common stock authorized for issuance under the Medivation Equity Incentive Plan was increased to 18,600,000 effective September 21, 2012. As a result of the stock split, the number of shares of the Company’s common stock issuable upon exercise of outstanding stock options and vesting of other stock-based awards was proportionally increased, and the exercise price per share thereof was proportionally decreased, in accordance with the terms of the Medivation Equity Incentive Plan.

On June 28, 2013, the Company’s stockholders approved an amendment and restatement of the Medivation Equity Incentive Plan to increase the aggregate number of shares of common stock authorized for issuance under the Medivation Equity Incentive Plan from 18,600,000 to 19,150,000.

Stock Options

The following table summarizes stock option activity for the six months ended June 30, 2013:

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (1)
Outstanding at December 31, 2012		7,038,291		$	18.90
Granted		337,606		$	49.75
Exercised		(308,914	)	$	11.82
Forfeited		(18,104	)	$	35.56
Outstanding at June 30, 2013		7,048,879		$	20.65		6.95	$	205.8
Vested and exercisable at June 30, 2013		4,093,583		$	11.67		5.72	$	153.6

⁽¹⁾  The aggregate intrinsic value is calculated as the pre-tax difference between the weighted average exercise price of the underlying awards and the closing price per share of $49.20 of the Company’s common stock on June 28, 2013. The calculation excludes any awards with an exercise price higher than the closing price of the Company’s common stock on June 28, 2013. The amounts are presented in millions.

The weighted-average grant-date fair value per share of options granted during the six months ended June 30, 2013 was $30.57.

Restricted Stock Units

The following table summarizes restricted stock unit activity for the six months ended June 30, 2013:

	Number of Shares			Weighted- Average Grant-Date Fair Value
Unvested at December 31, 2012		373,625		$	39.06
Granted		73,993		$	50.94
Vested		—			—
Forfeited		(1,856	)	$	52.92
Unvested at June 30, 2013		445,762		$	40.98

Stock Appreciation Rights

The Company granted stock appreciation rights to certain employees pursuant to the terms of the Medivation Equity Incentive Plan. Stock appreciation rights give the holder the right, upon exercise, to receive the difference between the market price per share of the Company’s common stock at the time of exercise and the exercise price of the stock appreciation right. The exercise price of the stock appreciation right is equal to the market price of the Company’s common stock at the date of the grant. The stock appreciation rights are settlable in shares of the Company’s common stock.

The following table summarizes stock appreciation rights activity for the six months ended June 30, 2013:

	Number of Rights			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (1)
Outstanding at December 31, 2012		883,600		$	23.91
Granted		—			—
Exercised		(22,410	)	$	23.20
Forfeited		—			—
Outstanding at June 30, 2013		861,190		$	23.93		8.48	$	21.8
Vested and exercisable at June 30, 2013		294,790		$	23.97		8.47	$	7.4

⁽¹⁾  The aggregate intrinsic value is calculated as the pre-tax difference between the weighted average exercise price of the underlying awards and the closing price per share of $49.20 of the Company’s common stock on June 28, 2013. The calculation excludes any awards with an exercise price higher than the closing price of the Company’s common stock on June 28, 2013. The amounts are presented in millions.

Performance Share Awards

There were no outstanding performance share awards under the Medivation Equity Incentive Plan at either June 30, 2013 or December 31, 2012.

Warrants

At June 30, 2013, warrants to purchase an aggregate of 45,808 shares of Medivation common stock at a weighted-average exercise price of $3.46 per share were outstanding. These outstanding warrants expire between 2014 and 2017.

Stock-Based Compensation

The Company estimates the fair value of stock options and stock appreciation rights using the Black-Scholes valuation model, which requires the use of subjective assumptions related to the estimated stock price volatility, estimated term, estimated dividend yield and risk-free interest rate. The Black-Scholes assumptions used for stock options and stock appreciation rights granted were as follows:

	Three Months Ended June 30,		Six Months Ended June 30,
	2013	2012	2013	2012
Risk-free interest rate	0.73-1.55%	0.83%	0.73-1.55%	0.83-1.01%
Estimated term (in years)	5.25-5.50	5.42	5.24-5.50	5.42-5.48
Estimated volatility	73-75%	71%	68-75%	71-73%
Estimated dividend yield	—	—	—	—

Stock-based compensation expense was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Stock-based compensation expense recognized as:
R&D expense	$	3,619	$	3,048	$	7,437	$	5,485
SG&A expense		4,512		2,533		8,990		4,432
Total	$	8,131	$	5,581	$	16,427	$	9,917

Unrecognized stock-based compensation expense totaled $77.2 million at June 30, 2013 and is expected to be recognized over a weighted-average period of 2.8 years.

(c) Medivation Employee Stock Purchase Plan

The Medivation, Inc. 2013 Employee Stock Purchase Plan, or ESPP, which was approved by the Company’s stockholders on June 28, 2013, permits eligible employees to purchase shares of the Company’s common stock through payroll deductions at the lower of 85% of the fair market value of the stock at the beginning or ending of a purchase period. Eligible employee contributions are limited on an annual basis to $25,000 in accordance with Section 423 of the Internal Revenue Code. The first purchase period under the plan will commence on October 1, 2013 and will conclude on March 31, 2014. As of June 30, 2013, a total of 3,000,000 shares of the Company’s common stock were authorized for issuance under the ESPP and no shares have been issued.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (4,898)	$ (5,500)	$ (32,068)	$ (5,060)
Other comprehensive loss:
Change in unrealized (loss) gain on available-for-sale securities, net	(4)	10	(21)	(10)
Other comprehensive (loss) income, net	(4)	10	(21)	(10)
Comprehensive loss	$ (4,902)	$ (5,490)	$ (32,089)	$ (5,070)

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 100,987	$ 71,301
Short-term investments	144,956	224,939
Receivable from collaboration partner	64,319	35,458
Restricted cash	343	343
Prepaid expenses and other current assets	14,711	12,175
Total current assets	325,316	344,216
Property and equipment, net	16,324	13,262
Restricted cash, net of current	9,899	8,843
Other non-current assets	6,369	5,545
Total assets	357,908	371,866
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	3,944	2,073
Accrued expenses and other current liabilities	57,485	48,951
Deferred revenue	25,396	33,862
Total current liabilities	86,825	84,886
Convertible Notes, net of unamortized discount of $56,774 and $62,743 at June 30, 2013 and December 31, 2012, respectively	201,976	196,007
Deferred revenue, net of current		8,465
Other non-current liabilities	7,475	8,863
Total liabilities	296,276	298,221
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $0.01 par value per share; 1,000,000 shares authorized; no shares issued and outstanding
Common stock, $0.01 par value per share; 170,000,000 shares authorized; 75,095,615 and 74,774,939 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively	751	748
Additional paid-in capital	384,485	364,412
Accumulated other comprehensive income	12	33
Accumulated deficit	(323,616)	(291,548)
Total stockholders' equity	61,632	73,645
Total liabilities and stockholders' equity	$ 357,908	$ 371,866

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Commitments And Contingencies - Additional Information (Detail) (USD $)	6 Months Ended						1 Months Ended	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Letter of credit [Member]	Dec. 31, 2012 Letter of credit [Member]	Jun. 30, 2013 Collateralized letter of credit [Member]	Dec. 31, 2012 Collateralized letter of credit [Member]	Jun. 30, 2013 Fourth amendment to lease agreement [Member] sqft	Jun. 30, 2013 Fourth amendment to lease agreement [Member] Y sqft	Jun. 30, 2013 Non-cancellable lease agreement [Member] sqft	Jun. 30, 2013 Illinois [Member] Non-cancellable lease agreement [Member] sqft	Jun. 30, 2013 Sales milestone payments [Member]	Jun. 30, 2013 Sales milestone payments [Member] Astellas [Member]	Jun. 30, 2013 Development milestone payments [Member]
Commitments And Contingencies [Line Items]
Tenant improvement allowance								$ 400,000
Outstanding letters of credit collateralized by restricted cash							1,100,000	1,100,000
Increase in operating lease space							13,000
Operating lease space, in square feet							98,000	98,000		15,000
Lease expiry period								June 2019		December 2019
Optional lease extension term, in years								5
Operating lease space, in square feet									14,000
Lease expiry period									December 2015
Outstanding letters of credit collateralized by restricted cash					10,200,000	9,200,000
Restricted cash, current			300,000	300,000
Restricted cash, long-term assets	9,899,000	8,843,000	9,900,000	8,800,000
Aggregate milestone payments upon achievement of certain development and regulatory milestone events													2,800,000
Percentage of development milestone payment													10.00%
Royalty percentage on sales													4.00%
Milestone payments eligible to earn											320,000,000		257,000,000
Percentage of sales milestone payments												10.00%
Maximum eligible future sales milestone payments under collaboration arrangement												320,000,000
Coverage under its relevant insurance policies	$ 350,000

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Collaboration Agreements - Substantive Development Milestone Payments Eligible to Receive under Astellas Collaboration Agreement (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	$ 7
4th line prostate cancer patients [Member] | First acceptance for filing of a marketing application [Member] | The U.S. [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement
4th line prostate cancer patients [Member] | First acceptance for filing of a marketing application [Member] | The first major country in Europe [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement
4th line prostate cancer patients [Member] | First acceptance for filing of a marketing application [Member] | Japan [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement
4th line prostate cancer patients [Member] | First approval of a marketing application [Member] | The U.S. [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement
4th line prostate cancer patients [Member] | First approval of a marketing application [Member] | The first major country in Europe [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement
4th line prostate cancer patients [Member] | First approval of a marketing application [Member] | Japan [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	15
3rd line prostate cancer patients [Member] | First acceptance for filing of a marketing application [Member] | The U.S. [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	10
3rd line prostate cancer patients [Member] | First acceptance for filing of a marketing application [Member] | The first major country in Europe [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	5
3rd line prostate cancer patients [Member] | First acceptance for filing of a marketing application [Member] | Japan [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	5
3rd line prostate cancer patients [Member] | First approval of a marketing application [Member] | The U.S. [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	30
3rd line prostate cancer patients [Member] | First approval of a marketing application [Member] | The first major country in Europe [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	15
3rd line prostate cancer patients [Member] | First approval of a marketing application [Member] | Japan [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	15
2nd line prostate cancer patients [Member] | First acceptance for filing of a marketing application [Member] | The U.S. [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	15
2nd line prostate cancer patients [Member] | First acceptance for filing of a marketing application [Member] | The first major country in Europe [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	10
2nd line prostate cancer patients [Member] | First acceptance for filing of a marketing application [Member] | Japan [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	10
2nd line prostate cancer patients [Member] | First approval of a marketing application [Member] | The U.S. [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	60
2nd line prostate cancer patients [Member] | First approval of a marketing application [Member] | The first major country in Europe [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	30
2nd line prostate cancer patients [Member] | First approval of a marketing application [Member] | Japan [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development milestone payments eligibility to receive under Collaboration Agreement	$ 30

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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Summary of Stock Option Activity

The following table summarizes stock option activity for the six months ended June 30, 2013:

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (1)
Outstanding at December 31, 2012		7,038,291		$	18.90
Granted		337,606		$	49.75
Exercised		(308,914	)	$	11.82
Forfeited		(18,104	)	$	35.56
Outstanding at June 30, 2013		7,048,879		$	20.65		6.95	$	205.8
Vested and exercisable at June 30, 2013		4,093,583		$	11.67		5.72	$	153.6

⁽¹⁾  The aggregate intrinsic value is calculated as the pre-tax difference between the weighted average exercise price of the underlying awards and the closing price per share of $49.20 of the Company’s common stock on June 28, 2013. The calculation excludes any awards with an exercise price higher than the closing price of the Company’s common stock on June 28, 2013. The amounts are presented in millions.

Summary of Restricted Stock Units

The following table summarizes restricted stock unit activity for the six months ended June 30, 2013:

	Number of Shares			Weighted- Average Grant-Date Fair Value
Unvested at December 31, 2012		373,625		$	39.06
Granted		73,993		$	50.94
Vested		—			—
Forfeited		(1,856	)	$	52.92
Unvested at June 30, 2013		445,762		$	40.98

Summary of Stock Appreciation Rights Activity

The following table summarizes stock appreciation rights activity for the six months ended June 30, 2013:

	Number of Rights			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (1)
Outstanding at December 31, 2012		883,600		$	23.91
Granted		—			—
Exercised		(22,410	)	$	23.20
Forfeited		—			—
Outstanding at June 30, 2013		861,190		$	23.93		8.48	$	21.8
Vested and exercisable at June 30, 2013		294,790		$	23.97		8.47	$	7.4

⁽¹⁾  The aggregate intrinsic value is calculated as the pre-tax difference between the weighted average exercise price of the underlying awards and the closing price per share of $49.20 of the Company’s common stock on June 28, 2013. The calculation excludes any awards with an exercise price higher than the closing price of the Company’s common stock on June 28, 2013. The amounts are presented in millions.

Schedule of Black-Scholes Assumptions Used for Stock Options and Stock Appreciations Rights

The Company estimates the fair value of stock options and stock appreciation rights using the Black-Scholes valuation model, which requires the use of subjective assumptions related to the estimated stock price volatility, estimated term, estimated dividend yield and risk-free interest rate. The Black-Scholes assumptions used for stock options and stock appreciation rights granted were as follows:

	Three Months Ended June 30,		Six Months Ended June 30,
	2013	2012	2013	2012
Risk-free interest rate	0.73-1.55%	0.83%	0.73-1.55%	0.83-1.01%
Estimated term (in years)	5.25-5.50	5.42	5.24-5.50	5.42-5.48
Estimated volatility	73-75%	71%	68-75%	71-73%
Estimated dividend yield	—	—	—	—

Schedule of Stock-Based Compensation Expense

Stock-based compensation expense was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Stock-based compensation expense recognized as:
R&D expense	$	3,619	$	3,048	$	7,437	$	5,485
SG&A expense		4,512		2,533		8,990		4,432
Total	$	8,131	$	5,581	$	16,427	$	9,917

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Stockholders' Equity - Summary of Stock Appreciation Rights Activity (Detail) (Stock appreciation rights [Member], USD $)	6 Months Ended
	Jun. 30, 2013
Stock appreciation rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Rights, Outstanding at December 31, 2012	883,600
Number of Rights, Granted
Number of Rights, Exercised	(22,410)
Number of Rights, Forfeited
Number of Rights, Outstanding at June 30, 2013	861,190
Number of Rights, Vested and exercisable at June 30, 2013	294,790
Weighted Average Exercise Price, Outstanding at December 31, 2012	$ 23.91
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised	$ 23.20
Weighted Average Exercise Price, Forfeited
Weighted Average Exercise Price, Outstanding at June 30, 2013	$ 23.93
Weighted Average Exercise Price, Vested and exercisable at June 30, 2013	$ 23.97
Weighted Average Remaining Contractual Term (in years), Outstanding at June 30, 2013	8 years 5 months 23 days
Weighted Average Remaining Contractual Term (in years), Vested and exercisable at June 30, 2013	8 years 5 months 19 days
Aggregate Intrinsic Value, Outstanding at June 30, 2013	$ 21.8
Aggregate Intrinsic Value, Vested and exercisable at June 30, 2013	$ 7.4

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Accrued Expenses and Other Current Liabilities - Components of Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Clinical and preclinical trials	$ 29,043	$ 25,150
Payroll and payroll-related	12,682	13,439
Royalties payable	4,809	2,296
Interest payable	1,698	1,698
Accrued professional services and other current liabilities	9,253	6,368
Total	$ 57,485	$ 48,951

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Collaboration Agreements - Development and Commercialization Cost-Sharing Payments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Development cost-sharing payments [Member]
Collaboration Agreements [Line Items]
Development cost-sharing payments	$ 11,309	$ 14,375	$ 18,547	$ 29,817
Development cost-sharing payments [Member] | Astellas [Member]
Collaboration Agreements [Line Items]
Development cost-sharing payments	11,309	14,013	18,547	28,128
Development cost-sharing payments [Member] | Pfizer [Member]
Collaboration Agreements [Line Items]
Development cost-sharing payments		362		1,689
Commercial cost sharing-payments [Member]
Collaboration Agreements [Line Items]
Commercialization cost-sharing payments	(3,791)	151	(8,576)	(661)
Commercial cost sharing-payments [Member] | Astellas [Member]
Collaboration Agreements [Line Items]
Commercialization cost-sharing payments	(3,791)	146	(8,576)	(670)
Commercial cost sharing-payments [Member] | Pfizer [Member]
Collaboration Agreements [Line Items]
Commercialization cost-sharing payments		$ 5		$ 9

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Net Income (Loss) Per Common Share - Schedule of Potentially Dilutive Securities (Detail) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Line Items]
Dilutive common shares excluded from net loss per common share computations	13,033	12,778
Stock options [Member]
Earnings Per Share [Line Items]
Dilutive common shares excluded from net loss per common share computations	7,049	7,348
Convertible notes [Member]
Earnings Per Share [Line Items]
Dilutive common shares excluded from net loss per common share computations	5,050	5,050
Restricted stock units [Member]
Earnings Per Share [Line Items]
Dilutive common shares excluded from net loss per common share computations	446	250
Stock appreciation rights [Member]
Earnings Per Share [Line Items]
Dilutive common shares excluded from net loss per common share computations	442
Performance shares [Member]
Earnings Per Share [Line Items]
Dilutive common shares excluded from net loss per common share computations		84
Warrants [Member]
Earnings Per Share [Line Items]
Dilutive common shares excluded from net loss per common share computations	46	46

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Accrued Expenses and Other Current Liabilities

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Accrued Expenses and Other Current Liabilities

NOTE 7 — ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

Accrued expenses and other current liabilities consisted of the following:

	June 30, 2013		December 31, 2012
Clinical and preclinical trials	$	29,043	$	25,150
Payroll and payroll-related		12,682		13,439
Royalties payable		4,809		2,296
Interest payable		1,698		1,698
Accrued professional services and other current liabilities		9,253		6,368
Total	$	57,485	$	48,951

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Collaboration Agreements - Substantive Development Milestone Payments Eligible to Receive under Astellas Collaboration Agreement (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Abstract]
Payment for triggering event	$ 7
Development milestone payments earned to date	78.0
Development milestone payments received to date	$ 63.0

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Stockholders' Equity - Summary of Stock Option Activity (Parenthetical) (Detail) (Stock options [Member], USD $)	Jun. 28, 2013
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing stock price of common stock	$ 49.20

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Fair Value Disclosures

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value Disclosures

NOTE 10 — FAIR VALUE DISCLOSURES

The Company follows ASC 820-10, “Fair Value Measurements and Disclosures,” which among other things, defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring or nonrecurring basis. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, a three-tier fair value hierarchy has been established, which prioritizes the inputs used in measuring fair value as follows:

• Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

• Level 2—Inputs (other than quoted prices included in Level 1) are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

• Level 3—Inputs reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

The following table presents the Company’s cash equivalents and short-term investments, as well as the hierarchy for its financial instruments measured at fair value on a recurring basis:

			Fair value measurements using:
	Fair Value		Level 1		Level 2		Level 3
June 30, 2013:
Cash equivalents:
Money market funds	$	50,156	$	50,156		—		—
Short-term investments:
U.S. Treasury bills	$	144,956	$	144,956		—		—
December 31, 2012:
Cash equivalents:
Money market funds	$	48,693	$	48,693		—		—
Short-term investments:
U.S. Treasury bills	$	224,939	$	224,939		—		—

At June 30, 2013, the amortized cost and gross unrealized gain for available-for-sale securities, consisting of U.S. Treasury bills maturing in September and December of 2013, were $144.9 million and $0.0 million, respectively. At December 31, 2012, the amortized cost and gross unrealized gain for available-for-sale securities, consisting of U.S. Treasury bills maturing in March and June of 2013, were $224.9 million and $0.0 million, respectively.

In the table below, the Company has presented the fair value of other financial instruments that are not measured at fair value on a recurring basis.

			Fair value measurements using:
	Fair Value		Level 1		Level 2		Level 3
June 30, 2013:
Assets:
Bank deposits (included in “Cash and cash equivalents”)	$	50,831	$	50,831		—		—
Liabilities:
Convertible Notes	$	237,070		—	$	237,070		—
December 31, 2012:
Assets:
Bank deposits (included in “Cash and cash equivalents”)	$	22,608	$	22,608		—		—
Liabilities:
Convertible Notes	$	234,813		—	$	234,813		—

Due to their short-term maturities, the Company believes that the fair value of its bank deposits, receivable from collaboration partner, accounts payable and accrued expenses and other current liabilities approximate their carrying value. The estimated fair value of the Company’s Convertible Notes, including the equity component, was $327.9 million at June 30, 2013 and was determined using recent trading prices of the Convertible Notes. The fair value of the Convertible Notes included in the table above represents only the liability component of the Convertible Notes, because the equity component is included in stockholders’ equity on the consolidated balance sheets.

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Property and Equipment, Net

6 Months Ended

Jun. 30, 2013

Property Plant And Equipment [Abstract]

Property and Equipment, Net

NOTE 6 — PROPERTY AND EQUIPMENT, NET

Property and equipment, net, consisted of the following:

	June 30, 2013			December 31, 2012
Leasehold improvements	$	11,959		$	9,057
Furniture and fixtures		3,944			2,648
Computer equipment and software		3,606			3,166
Laboratory equipment		244			244
Construction in progress		138			281
		19,891			15,396
Less: Accumulated depreciation and amortization		(3,567	)		(2,134	)
Total	$	16,324		$	13,262

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Description of Business

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Description of Business

NOTE 1 — DESCRIPTION OF BUSINESS

Medivation, Inc. (the “Company” or “Medivation”) is a biopharmaceutical company focused on the rapid development and commercialization of novel therapies to treat serious diseases for which there are limited treatment options. The Company selects technologies for development that meet three primary criteria, namely, the technology has: (a) in the judgment of the Company’s scientific leadership, an above-average likelihood of working; (b) strong intellectual property and/or data exclusivity protection; and (c) the ability to target one or more serious diseases for which existing technologies are suboptimal. When selecting technologies for development, the Company focuses primarily on those that it believes have the ability to enter human studies within 12-18 months. The Company considers technologies without regard to therapeutic indication or therapeutic modality (i.e., small molecules, biologics, medical devices, etc). The Company may develop technologies through its own internal research activities, or in-license technologies from academic institutions or other third parties. Once the Company selects a technology for development, it seeks to advance it quickly, strategically and cost-effectively to commercialization. The Company’s commercialization strategy for any of its product candidates that receive marketing approval will vary depending on the target customer base for that product candidate, the Company’s then current commercial capabilities, the extent to which the Company deems it prudent and cost-effective to build additional internal capabilities, and the availability, quality and cost of third-party commercialization partners.

The Company’s most advanced program is XTANDI^® (enzalutamide) capsules, or XTANDI, which is partnered with Astellas Pharma Inc., or Astellas. The Company in-licensed the intellectual property rights covering XTANDI in 2005, began its first clinical trial in 2007, entered into a collaboration agreement with Astellas in 2009, reported positive Phase 3 overall survival data in 2011 in patients with metastatic castration-resistant prostate cancer who have previously received docetaxel, or post-chemotherapy mCRPC patients, and on August 31, 2012, received regulatory approval from the U.S. Food and Drug Administration, or FDA, for the treatment of post-chemotherapy mCRPC patients. The Company and Astellas began co-promoting XTANDI for that indication in the United States on September 13, 2012. On June 24, 2013, the Company announced that XTANDI was granted marketing authorization in the European Union, or EU, for the treatment of adult men with mCRPC whose disease has progressed on or after docetaxel therapy. XTANDI is approved in Canada and South Korea for the post-docetaxel indication and marketing applications for XTANDI are under review in Argentina, Australia, Brazil, Japan, South Africa and Switzerland. Together with Astellas, the Company is also conducting multiple trials of enzalutamide in earlier prostate cancer disease states, including the Phase 3 PREVAIL trial in patients with mCRPC who have not received chemotherapy, or pre-chemotherapy mCRPC, and in patients with metastatic breast cancer. The Company also has ongoing programs with other agents in multiple different indications in early stages of research and development. These early-stage programs are unpartnered.

In January 2012, the Company’s former collaboration partner Pfizer, Inc., or Pfizer, exercised its right to terminate the Company’s collaboration agreement for the development and commercialization of the Company’s former product candidate dimebon for the treatment of Alzheimer’s disease and Huntington disease, due to negative Phase 3 trial results in both indications. The Company and Pfizer discontinued development of dimebon for all indications in January 2012, and completed the wind-down of each of its respective remaining collaboration activities in the third quarter of 2012.

The Company has funded its operations primarily through public offerings of its common stock, the issuance of 2.625% convertible senior notes due April 1, 2017, or the Convertible Notes, from up-front, development milestone and cost-sharing payments under its collaboration agreement with Astellas, or the Astellas Collaboration Agreement, and its former collaboration agreement with Pfizer and, subsequent to September 13, 2012, from collaboration revenue attributable to XTANDI sales. The Company has incurred cumulative net losses of $323.6 million through June 30, 2013, and expects to incur substantial additional losses for the foreseeable future as it continues to finance the commercialization of XTANDI in the U.S. market, clinical and preclinical studies of enzalutamide and the Company’s early-stage technologies, and its corporate overhead costs. The Company does not know when, or if, it will become profitable, or whether XTANDI will be approved for sale in the United States, EU, Canada, or South Korea for any indication other than treatment of post-chemotherapy mCRPC patients, or will be approved for sale in any other market for any indication.

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Commitments And Contingencies - Future Minimum Payments under Non-Cancelable Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Commitments And Contingencies Disclosure [Abstract]
2013 (remainder of year)	$ 3,491
2014	7,772
2015	7,943
2016	6,250
2017	6,356
2018 and thereafter	9,832
Total	$ 41,644

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Stockholders' Equity - Schedule of Stock-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 8,131	$ 5,581	$ 16,427	$ 9,917
R&D expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	3,619	3,048	7,437	5,485
SG&A expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 4,512	$ 2,533	$ 8,990	$ 4,432

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Collaboration Agreements - Schedule of Collaboration Revenue Attributable to Up-Front and Milestone Payments (Detail) (Up-front cash payment arrangement [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Total	$ 28,466	$ 42,912	$ 36,931	$ 79,737
Astellas [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Total	28,466	7,256	36,931	13,193
Pfizer [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Total		$ 35,656		$ 66,544

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Collaboration Agreements (Tables)

6 Months Ended

Jun. 30, 2013

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Substantive Development Milestone Payments Eligible to Receive under Astellas Collaboration Agreement

The remaining $257.0 million in development milestone payments the Company is eligible to receive under the Astellas Collaboration Agreement are as follows:

Milestone Event	4th line prostate  cancer patients (1)			3rd line prostate  cancer patients (2)		2nd line prostate  cancer patients (3) (4)
First acceptance for filing of a marketing application in:
The U.S.			(5)	$	10 million	$	15 million
The first major country in Europe			(5)	$	5 million	$	10 million
Japan			(5)	$	5 million	$	10 million
First approval of a marketing application in:
The U.S.			(5)	$	30 million	$	60 million
The first major country in Europe			(5)	$	15 million	$	30 million
Japan	$	15 million		$	15 million	$	30 million

⁽¹⁾  Defined as prostate cancer patients who meet each of the following three criteria: (a) prior treatment failure on either (i) one or more luteinizing hormone-releasing hormone, or LHRH, analog drugs or (ii) surgical castration; (b) prior treatment failure on one or more androgen receptor antagonist drugs; and (c) prior treatment failure on chemotherapy.

⁽²⁾  Defined as prostate cancer patients who meet each of the following three criteria: (a) prior treatment failure on either (i) one or more LHRH analog drugs or (ii) surgical castration; (b) prior treatment failure on one or more androgen receptor antagonist drugs; and (c) no prior exposure to chemotherapy for prostate cancer.

⁽³⁾  Defined as prostate cancer patients who meet each of the following two criteria: (a) prior treatment failure on either (i) one or more LHRH analog drugs or (ii) surgical castration; and (b) no prior treatment failure on one or more androgen receptor antagonist drugs.

⁽⁴⁾  An additional milestone payment of $7.0 million is payable upon the first to occur of: (a) first approval of a marketing application in the United States with a label encompassing 2nd line prostate cancer patients; (b) first approval of a marketing application in the first major country in Europe with a label encompassing 2nd line prostate cancer patients; (c) first approval of a marketing application in Japan with a label encompassing 2nd line prostate cancer patients; or (d) first patient dosed in a Phase 3 clinical trial other than the PREVAIL trial that is designed specifically to support receipt of marketing approval in 2nd line patients.

⁽⁵⁾  These milestone payments totaling $78.0 million have been previously earned and payments totaling $63.0 million had been received as of June 30, 2013. A $15.0 million milestone payment, which was included in “receivable from collaboration partner” on the accompanying unaudited consolidated balance sheet at June 30, 2013, was received during the third quarter of 2013.

Schedule of Collaboration Revenue

Collaboration revenue was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Collaboration revenue:
Attributable to U.S. XTANDI sales	$	41,201	$	—	$	78,890	$	—
Attributable to ex-U.S. XTANDI sales		482		—		482		—
Attributable to up-front and milestone payments		28,466		42,912		36,931		79,737
Total	$	70,149	$	42,912	$	116,303	$	79,737

Schedule of Collaboration Revenue Attributable to Sales

Collaboration revenue attributable to U.S. XTANDI sales was as follows:

	Three Months Ended June  30, 2013			Six Months Ended June 30, 2013
Net U.S. sales (as reported by Astellas)	$	82,402		$	157,780
Shared U.S. development and commercialization costs		(61,431	)		(119,101	)
Pre-tax U.S. profit	$	20,971		$	38,679
Medivation’s share of pre-tax U.S. profit	$	10,486		$	19,340
Reimbursement of Medivation’s share of shared U.S. costs		30,715			59,550
Collaboration revenue attributable to U.S. XTANDI sales	$	41,201		$	78,890

Schedule of Collaboration Revenue Attributable to Up-Front and Milestone Payments

Collaboration revenue attributable to up-front and milestone payments was as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Collaboration revenue attributable to up-front and milestone payments:
From Astellas	$	28,466	$	7,256	$	36,931	$	13,193
From Pfizer		—		35,656		—		66,544
Total	$	28,466	$	42,912	$	36,931	$	79,737

Deferred Revenue

Deferred revenue under the Astellas Collaboration Agreement consisted of the following:

	June 30, 2013		December 31, 2012
Current	$	25,396	$	33,862
Long-term		—		8,465
Total	$	25,396	$	42,327

Development and Commercialization Cost-Sharing Payments

The following table summarizes the reductions in R&D expenses related to development cost-sharing payments:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Development cost-sharing payments from Astellas	$	11,309	$	14,013	$	18,547	$	28,128
Development cost-sharing payments from Pfizer		—		362		—		1,689
Total	$	11,309	$	14,375	$	18,547	$	29,817

The following table summarizes the (increases) reductions in SG&A expenses related to commercialization cost-sharing payments:

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Commercialization cost-sharing payments (to) from Astellas	$	(3,791	)	$	146	$	(8,576	)	$	(670	)
Commercialization cost-sharing payments from Pfizer		—			5		—			9
Total	$	(3,791	)	$	151	$	(8,576	)	$	(661	)

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Income Taxes

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 9 — INCOME TAXES

The Company calculates its quarterly income tax provision in accordance with the guidance provided by ASC 740-270, “Interim Income Tax Accounting,” whereby the Company forecasts its estimated annual effective tax rate and then applies that rate to its year-to-date pre-tax book income (loss). The Company’s income tax expense for the three and six months ended June 30, 2013 and 2012 was not significant.

Based upon the weight of available evidence, which includes the Company’s historical operating performance, reported cumulative net losses since inception, and expected continuing net loss, the Company has established and continues to maintain a full valuation allowance against its deferred tax assets as the Company does not currently believe that realization of those assets is more likely than not.

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Accrued Expenses and Other Current Liabilities (Tables)

6 Months Ended

Jun. 30, 2013

Text Block [Abstract]

Components of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following:

	June 30, 2013		December 31, 2012
Clinical and preclinical trials	$	29,043	$	25,150
Payroll and payroll-related		12,682		13,439
Royalties payable		4,809		2,296
Interest payable		1,698		1,698
Accrued professional services and other current liabilities		9,253		6,368
Total	$	57,485	$	48,951

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Net Income (Loss) Per Common Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Schedule of Potentially Dilutive Securities

Outstanding securities, and the number of potentially dilutive common shares underlying such securities, were as follows:

	June 30,
	2013		2012
Stock options		7,049		7,348
Convertible Notes		5,050		5,050
Restricted stock units		446		250
Stock appreciation rights		442		—
Performance shares		—		84
Warrants		46		46
Total		13,033		12,778

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Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Aug. 02, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	MDVN
Entity Registrant Name	MEDIVATION, INC.
Entity Central Index Key	0001011835
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		75,212,035

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Property and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2013

Property Plant And Equipment [Abstract]

Schedule of Property and Equipment, Net

Property and equipment, net, consisted of the following:

	June 30, 2013			December 31, 2012
Leasehold improvements	$	11,959		$	9,057
Furniture and fixtures		3,944			2,648
Computer equipment and software		3,606			3,166
Laboratory equipment		244			244
Construction in progress		138			281
		19,891			15,396
Less: Accumulated depreciation and amortization		(3,567	)		(2,134	)
Total	$	16,324		$	13,262