LIMITED POWER OF ATTORNEY FOR
SECTION 16 REPORTING OBLIGATIONS

	Know all by these presents, that the undersigned's hereby makes, constitutes and appoints Patrick Machado as the
undersigned's true and lawful attorney-in-fact, with full power and authority as hereinafter described on behalf of and in the
name, place and stead of the undersigned to:

(1)	prepare, execute, acknowledge, deliver and file Forms 3, 4, and 5 (including any amendments thereto) with
respect to the securities of Medivation, Inc., a Delaware corporation (the "Company"), with the United States
Securities and Exchange Commission, any national securities exchanges and the Company, as considered
necessary or advisable under Section 16(a) of the Exchange Act and the rules and regulations promulgated
thereunder, as amended from time to time;

(2)	seek or obtain, as the undersigned's representative and on the undersigned's behalf, information on
transactions in the Company's securities from any third party, including brokers, employee benefit plan
administrators and trustees, and the undersigned hereby authorizes any such person to release any such
information to the undersigned and approves and ratifies any such release of information; and

(3)	perform any and all other acts which in the discretion of such attorney-in-fact are necessary or desirable
for and on behalf of the undersigned in connection with the foregoing.

The undersigned acknowledges that:

(1)	this Power of Attorney authorizes, but does not require, such attorney-in-fact to act in their discretion on
information provided to such attorney-in-fact without independent verification of such information;

(2)	any documents prepared and/or executed by such attorney-in-fact on behalf of the undersigned pursuant
to this Power of Attorney will be in such form and will contain such information and disclosure as such attorney-in-
fact, in his or her discretion, deems necessary or desirable;

(3)	neither the Company nor such attorney-in-fact assumes (i) any liability for the undersigned's responsibility
to comply with the requirement of the Exchange Act, (ii) any liability of the undersigned for any failure to comply
with such requirements, or (iii) any obligation or liability of the undersigned for profit disgorgement under Section
16(b) of the Exchange Act; and

(4)	this Power of Attorney does not relieve the undersigned from responsibility for compliance with the
undersigned's obligations under the Exchange Act, including without limitation the reporting requirements under
Section 16 of the Exchange Act.

	The undersigned hereby gives and grants the foregoing attorney-in-fact full power and authority to do and perform
all and every act and thing whatsoever requisite, necessary or appropriate to be done in and about the foregoing matters as
fully to all intents and purposes as the undersigned might or could do if present, hereby ratifying all that such attorney-in-
fact of, for and on behalf of the undersigned, shall lawfully do or cause to be done by virtue of this Limited Power of
Attorney.

	This Power of Attorney shall remain in full force and effect until revoked by the undersigned in a signed
writing delivered to such attorney-in-fact.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 22nd
day of April 2013.



                                                			_/s/ Wendy L. Yarno