EX-99.A.1.C

Exhibit (a)(1)(C)

NOTICE OF GUARANTEED DELIVERY

(Not to be Used for Signature Guarantee)

for

To Tender Shares of Common Stock

(Including the Associated Preferred Stock Purchase Rights)

MYLAN LABORATORIES INC.

Pursuant to its Offer to Purchase dated June 16, 2005

THE OFFER, PRORATION PERIOD AND WITHDRAWAL RIGHTS WILL

EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON FRIDAY, JULY 15, 2005,

UNLESS THE OFFER IS EXTENDED.

As set forth in Section 3 of the Offer to Purchase (as hereinafter defined), this Notice of Guaranteed Delivery, or one substantially in the form hereof, must be used to accept the Offer (as hereinafter defined) if (a) certificates evidencing shares of common stock, par value $0.50 per share, including the associated preferred stock purchase rights (the “Shares”), of Mylan Laboratories Inc., a Pennsylvania corporation (“Mylan”), are not immediately available or cannot be delivered to the Depositary by the Expiration Date (as defined in the Offer to Purchase), (b) the procedure for book-entry transfer described in the Offer to Purchase and the related Letter of Transmittal cannot be completed on a timely basis or (c) time will not permit all required documents, including a properly completed and duly executed Letter of Transmittal, to reach the Depositary prior to the Expiration Date.

This Notice of Guaranteed Delivery, properly completed and duly executed, may be delivered by hand, mail, overnight courier or facsimile transmission to the Depositary on or before the Expiration Date. See Section 3 of the Offer to Purchase.

The Depositary for the Offer is:

American Stock Transfer & Trust Company


By Hand:		By Mail or Overnight Delivery:
59 Maiden Lane		American Stock Transfer & Trust Company
New York, New York 10038		Operations Center
		Attn: Reorganization Department
		6201-15th Avenue
		Brooklyn, NY 11219

By Facsimile:

(For Eligible Institutions Only)

(718) 234-5001

Telephone:

(877) 248-6417

DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE TRANSMISSION OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A VALID DELIVERY. DELIVERIES TO MYLAN, THE DEALER MANAGER OR THE INFORMATION AGENT WILL NOT BE FORWARDED TO THE DEPOSITARY AND THEREFORE WILL NOT CONSTITUTE VALID DELIVERY. DELIVERIES TO DTC DOES NOT CONSTITUTE VALID DELIVERY TO THE DEPOSITARY.

THIS NOTICE OF GUARANTEED DELIVERY IS NOT TO BE USED TO GUARANTEE SIGNATURES. IF A SIGNATURE ON THE LETTER OF TRANSMITTAL IS REQUIRED TO BE GUARANTEED BY AN ELIGIBLE INSTITUTION (AS DEFINED IN THE OFFER TO PURCHASE) UNDER THE INSTRUCTIONS TO THE LETTER OF TRANSMITTAL, SUCH SIGNATURE GUARANTEE MUST APPEAR IN THE APPLICABLE SPACE PROVIDED IN THE SIGNATURE BOX ON THE LETTER OF TRANSMITTAL.

Ladies and Gentlemen:

The undersigned hereby tenders to Mylan, upon the terms and subject to the conditions described in the Offer to Purchase, dated June 16, 2005 (the “Offer to Purchase”), and in the related Letter of Transmittal (which together, as each may be supplemented or amended from time to time, constitute the “Offer”), receipt of which is hereby acknowledged, the number (indicated herein) of shares of Mylan’s common stock, par value $0.50 per share, pursuant to the guaranteed delivery procedure described in Section 3 of the Offer to Purchase. Unless the context requires otherwise, all references to Shares shall refer to the shares of common stock, par value $0.50 per share, of Mylan and shall include the associated preferred stock purchase rights issued pursuant to the Rights Agreement, dated as of August 22, 1996, between Mylan and American Stock Transfer & Trust Company, as amended as of November 8, 1999, August 13, 2004, September 8, 2004 and December 2, 2004. All Shares tendered and purchased will include such associated preferred stock purchase rights.

NUMBER OF SHARES TO BE TENDERED: SHARES

CHECK ONLY ONE BOX. IF MORE THAN ONE BOX IS CHECKED, OR IF NO BOX IS CHECKED, THERE IS NO VALID TENDER OF SHARES.

SHARES TENDERED AT PRICE DETERMINED PURSUANT TO THE OFFER

(See Instruction 5 of the Letter of Transmittal)

The undersigned wishes to maximize the chance of having Mylan purchase all the Shares the undersigned is tendering (subject to the possibility of proration). Accordingly, by checking this ONE box INSTEAD OF ONE OF THE PRICE BOXES BELOW, the undersigned hereby tenders Shares and is willing to accept the purchase price determined by Mylan pursuant to the Offer. This action will result in receiving a price per Share of as low as $18.00 or as high as $20.50.

— OR —

SHARES TENDERED AT PRICE DETERMINED BY SHAREHOLDER

(See Instruction 5 of the Letter of Transmittal)

By checking ONE of the boxes below INSTEAD OF THE BOX ABOVE, the undersigned hereby tenders Shares at the price checked. This action could result in none of the Shares being purchased if the purchase price for the Shares is less than the price checked. If the purchase price for the Shares is equal to or greater than the price checked, then the Shares purchased by Mylan will be purchased at the purchase price. A shareholder who wishes to tender Shares at more than one price must complete a separate Letter of Transmittal for each price at which Shares are being tendered. The same Shares cannot be tendered (unless previously properly withdrawn in accordance with the terms of the Offer) at more than one price.

PRICE (IN DOLLARS) PER SHARE AT WHICH SHARES ARE BEING TENDERED

o$18.00

o$18.75

o$19.50

o$20.25

o$18.25

o$19.00

o$19.75

o$20.50

o$18.50

o$19.25

o$20.00

CONDITIONAL TENDER

(See Instruction 15 of the Letter of Transmittal)

A shareholder may tender his or her Shares subject to the condition that a specified minimum number of the shareholder’s Shares tendered pursuant to this Letter of Transmittal must be purchased if any Shares tendered are purchased, all as described in the Offer to Purchase, particularly in Section 6 thereof. Any shareholder desiring to make a conditional tender must so indicate in the box captioned “Conditional Tender” below. It is the tendering shareholder’s responsibility to determine the minimum number of Shares to be purchased. Unless this box has been checked and a minimum specified, the tender will be deemed unconditional:


o	The minimum number of Shares that must be purchased, if any are purchased, is Shares.

If, because of proration, the minimum number of Shares designated will not be purchased, Mylan may accept conditional tenders by random lot, if necessary. However, to be eligible for purchase by random lot, the tendering shareholder must have properly tendered all of his or her Shares and checked the box below:


o	The tendered Shares represent all Shares held by the undersigned.

Name(s) of Record Holder(s):

(Please Type or Print)

Certificate No(s).:

Address(es):

(Include Zip Code)

Daytime Area Code and Telephone No.:

Taxpayer ID No(s). or Social Security No(s).:

If Shares will be delivered by book-entry transfer, provide the following information:

Account Number:

Date:

Signature(s):

GUARANTEE

(Not to be used for signature guarantee)

The undersigned, a bank, broker, dealer, credit union, savings association or other entity that is a member in good standing of the Securities Transfer Agents Medallion Program or a bank, broker, dealer, credit union, savings association or other entity which is an “eligible guarantor institution,” as that term is defined in Rule 17Ad-15 promulgated under the Securities Exchange Act of 1934, as amended (each of the foregoing constituting an “Eligible Institution”), guarantees the delivery to the Depositary of the Shares tendered, in proper form for transfer, or a confirmation that the Shares tendered have been delivered pursuant to the procedure for book-entry transfer described in the Offer to Purchase into the Depositary’s account at DTC, together with a properly completed and duly executed Letter of Transmittal, or a manually signed facsimile of the Letter of Transmittal, or an Agent’s Message (as defined in the Offer to Purchase) in the case of a book-entry transfer, and any other required documents, all within three business days of this date.

The Eligible Institution that completes this form must communicate the guarantee to the Depositary and must deliver the Letter of Transmittal and certificates representing Shares to the Depositary within the time period set forth herein. Failure to do so could result in a financial loss to the Eligible Institution.




Name of Firm		Authorized Signature

Address		Title
Zip Code		Name: (Please Type or Print)
Area Code and Tel. No.		Dated:


NOTE:	DO NOT SEND SHARE CERTIFICATES WITH THIS FORM. CERTIFICATES FOR SHARES SHOULD BE SENT WITH THE LETTER OF TRANSMITTAL.