===============================================================================
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                         ____________________________
                                Amendment No. 5
                                  Schedule TO
           Tender Offer Statement under Section 14(d)(1) or 13(e)(1)
                    Of the Securities Exchange Act of 1934
                         ____________________________
                            Mylan Laboratories Inc.
        (Name of Subject Company (Issuer) and Filing Person (Offeror))
                         ____________________________
                    Common Stock, par value $0.50 per share
                        (Titles of Class of Securities)
                         ____________________________
                                   628530107
                     (CUSIP Number of Class of Securities)
                         ____________________________

                              Edward J. Borkowski
                            Chief Financial Officer
                            Mylan Laboratories Inc.
                             1500 Corporate Drive
                        Canonsburg, Pennsylvania 15317
                                (724) 514-1800
 (Name, Address and Telephone Number of Person Authorized to Receive Notices and
                Communications on Behalf of the Filing Persons)
                         ____________________________
                                  Copies To:

                             Roger S. Aaron, Esq.
                             Eric L. Cochran, Esq.
                   Skadden, Arps, Slate, Meagher & Flom LLP
                               Four Times Square
                           New York, New York 10036
                                (212) 735-3000


|_|   Check the box if the filing relates solely to preliminary
      communications made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which the
statement relates: 

|_|   third-party tender offer subject to Rule 14d-1.
|X|   issuer tender offer subject to Rule 13e-4.
|_|   going-private transaction subject to Rule 13e-3.
|_|   amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the
results of the tender offer: |X|

===============================================================================




                  This Amendment No. 5 amends and supplements the Tender Offer
Statement on Schedule TO ("Schedule TO") filed with the Securities and
Exchange Commission (the "Commission") on June 16, 2005, as amended and
supplemented by Amendment No. 1 to Schedule TO filed with the Commission on
June 17, 2005, Amendment No. 2 to Schedule TO filed with the Commission on
July 11, 2005, Amendment No. 3 to Schedule TO filed with the Commission on
July 15, 2005, and Amendment No. 4 to Schedule TO filed with the Commission on
July 18, 2005, by Mylan Laboratories Inc., a Pennsylvania corporation ("Mylan"
or the "Company"), in connection with Mylan's offer to purchase for cash up to
48,780,487 shares of its common stock, par value $0.50 per share, including
the associated preferred stock purchase rights (the "Common Stock"), or such
lesser number of shares of Common Stock as are properly tendered and not
properly withdrawn (the "Shares"), at a price not greater than $20.50 nor less
than $18.00 per Share, net to the seller in cash, without interest. Mylan's
offer was made upon the terms and subject to the conditions set forth in the
Offer to Purchase, dated June 16, 2005 ("Offer to Purchase"), and in the
related Letter of Transmittal ("Letter of Transmittal") which, as amended or
supplemented from time to time, together constituted the offer.

                  All information in the Offer to Purchase and in the related
Letter of Transmittal is hereby expressly incorporated in this Amendment No. 5
to Schedule TO by reference in response to all of the applicable items in
Schedule TO, except that such information is hereby amended and supplemented
to the extent specifically provided herein.

ITEM 11. Additional Information.

Item 11 of the Schedule TO is hereby amended and supplemented by adding the
following:

         On July 22, 2005, the Company issued a press release announcing the
final results of the tender offer, which expired at 12:00 midnight, New York
City time, on Friday, July 15, 2005. A copy of the press release is filed as
Exhibit (a)(5)(G) to this Schedule TO and is incorporated herein by reference.

ITEM 12.          Exhibits.

Item 12 of the Schedule TO is hereby amended and supplemented by adding the
following:

         (a)(5)(G) Press release issued by Mylan on July 22, 2005.




                                   SIGNATURE

                  After due inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this statement is true,
complete and correct.

                                            MYLAN LABORATORIES INC.


                                            By:  /s/EDWARD J. BORKOWSKI
                                               -----------------------------
                                            Name: Edward J. Borkowski
                                            Title:   Chief Financial Officer


Date:  July 22, 2005






                               INDEX TO EXHIBITS


       Exhibit
       Number           Document
       -------          --------

       (a)(1)(A)        Offer to Purchase dated June 16, 2005.******

       (a)(1)(B)        Letter of Transmittal (including Guidelines of the
                        Internal Revenue Service for Certification of Taxpayer
                        Identification Number on
                        Substitute Form W-9).*****

       (a)(1)(C)        Notice of Guaranteed Delivery.*****

       (a)(1)(D)        Letter to Shareholders, dated June 16, 2005.******

       (a)(1)(E)        Letter to Brokers, Dealers, Banks, Trust
                        Companies and Other Nominees.******

       (a)(1)(F)        Letter to Clients for use by Brokers, Dealers, Banks,
                        Trust Companies and Other Nominees.*****

       (a)(1)(G)        Letter from Mylan Laboratories Inc. to Participants in
                        its Profit Sharing 401(k) Plan.*****

       (a)(5)(A)        Form of Summary Advertisement.******

       (a)(5)(B)        Press Release issued by the registrant on June 16,
                        2005.******

       (a)(5)(C)        Press Release issued by the registrant on July 6,
                        2005.**** 

       (a)(5)(D)        Press Release issued by the registrant on July 11,
                        2005.**** 

       (a)(5)(E)        Press Release issued by the registrant on July 15,
                        2005.***

       (a)(5)(F)        Press Release issued by the registrant on July 17,
                        2005.** 

       (a)(5)(G)        Press Release issued by the registrant on July 22,
                        2005.* 

       (b)              Commitment Letter from Merrill Lynch Capital
                        Corporation and Merrill Lynch, Pierce, Fenner &
                        Smith Incorporated, dated as of June 13, 2005.******

       (d)(1)           Rights Agreement dated as of August 22, 1996,
                        between the registrant and American Stock Transfer &
                        Trust Co., filed as Exhibit 4.1 to Form 8-K filed with
                        the SEC on September 3, 1996, and incorporated herein
                        by reference.

       (d)(2)           Amendment to Rights Agreement dated as of November 8,
                        1999, between the registrant and American Stock
                        Transfer & Trust Co., filed as Exhibit 1 to Form
                        8-A/A, filed with the SEC on March 31, 2000.

       (d)(3)           Amendment No. 2 to Rights Agreement dated as of August
                        13, 2004, between the registrant and American Stock
                        Transfer & Trust Company, filed as Exhibit 4.1 to the
                        Report on Form 8-K filed with the SEC on August 16,
                        2004, and incorporated herein by reference.

       (d)(4)           Amendment No. 3 to Rights Agreement dated as of
                        September 8, 2004, between the registrant and American
                        Stock Transfer & Trust Company, filed as Exhibit 4.1
                        to the Report on Form 8-K filed with the SEC on
                        September 9, 2004, and incorporated herein by
                        reference.

       (d)(5)           Amendment No. 4 to Rights Agreement dated as of
                        December 2, 2004, between the registrant and American
                        Stock Transfer & Trust Company, filed as Exhibit 4.1 to
                        the Report on Form 8-K filed with the SEC on December
                        3, 2004, and incorporated herein by reference.

       (d)(6)           Mylan Laboratories Inc. 1986 Incentive Stock Option
                        Plan, as amended to date, filed as Exhibit 10(b) to
                        Form 10-K for the fiscal year ended March 31, 1993,
                        and incorporated herein by reference.

       (d)(7)           Mylan Laboratories Inc. 1997 Incentive Stock Option
                        Plan, as amended to date, filed as Exhibit 10.3 to
                        Form 10-Q for the quarter ended September 30, 2002,
                        and incorporated herein by reference.

       (d)(8)           Mylan Laboratories Inc. 1992 Nonemployee Director
                        Stock Option Plan, as amended to date, filed as
                        Exhibit 10(l) to Form 10-K for the fiscal year ended
                        March 31, 1998, and incorporated herein by reference.

       (d)(9)           Mylan Laboratories Inc. 2003 Long-Term Incentive Plan,
                        filed as Appendix A to Definitive Proxy Statement on
                        Schedule 14A, filed with the SEC on June 23, 2003, and
                        incorporated herein by reference.

       (d)(10)          Executive Employment Agreement dated July 22, 2002,
                        between the registrant and Robert J. Coury, filed as
                        Exhibit 10.1 to Form 10-Q for the quarter ended June
                        30, 2002, and incorporated herein by reference.

       (d)(11)          Amendment No. 1 to Executive Employment Agreement
                        dated as of December 15, 2003, between the registrant
                        and Robert J. Coury, filed as Exhibit 10.15(a) to Form
                        10-Q for the quarter ended December 31, 2003, and
                        incorporated herein by reference.

       (d)(12)          Executive Employment Agreement dated as of July 1,
                        2004, between the registrant and Edward J. Borkowski,
                        filed as Exhibit 10.27 to Form 10-Q/A for the quarter
                        ended September 30, 2004 and incorporated herein by
                        reference.

       (d)(13)          Executive Employment Agreement dated as of July 1,
                        2004, between the registrant and Louis J. DeBone,
                        filed as Exhibit 10.28 to Form 10-Q/A for the quarter
                        ended September 30, 2004 and incorporated herein by
                        reference.

       (d)(14)          Executive Employment Agreement dated as of July 1,
                        2004, between the registrant and John P. O'Donnell,
                        filed as Exhibit 10.29 to Form 8-K, filed with the SEC
                        on December 3, 2004 and incorporated herein by
                        reference.

       (d)(15)          Executive Employment Agreement dated as of July 1,
                        2004, between the registrant and Stuart A. Williams,
                        filed as Exhibit 10.30 to Form 10-Q/A for the quarter
                        ended September 30, 2004, and incorporated herein by
                        reference.

       (d)(16)          Form of Employment Agreement dated as of December 15,
                        2003, between the registrant and certain executive
                        officers (other than named executive officers), filed
                        as Exhibit 10.18 to Form 10 Q for the quarter ended
                        December 31, 2003, and incorporated herein by
                        reference.

       (d)(17)          Penederm Incorporated Employee Stock Option Plan
                        incorporated by reference to Exhibit 4.1 to the
                        Registration Statement on Form S-8, filed with the
                        Commission on October 5, 1998, File No. 333-65329.

       (d)(18)          Penederm Incorporated 1994 Nonemployee Directors Stock
                        Option Plan incorporated by reference to Exhibit 4.1
                        to the Registration Statement on Form S-8, filed with
                        the Commission on October 5, 1998, File No. 333-65327.

       (g)              Not applicable.

       (h)              Not applicable.

         _________________

         *        Filed herewith.

         **       Previously filed on Amendment No. 4 to Schedule TO on
                  July 18, 2005.

         ***      Previously filed on Amendment No. 3 to Schedule TO on
                  July 15, 2005.

         ****     Previously filed on Amendment No. 2 to Schedule TO on
                  July 11, 2005.

         *****    Previously filed on Amendment No. 1 to Schedule TO on
                  June 17, 2005.

         ******   Previously filed on Schedule TO on June 16, 2005.






                                                           Exhibit (a)(5)(G)


FOR IMMEDIATE RELEASE 

                                        CONTACTS:
                                        Patrick Fitzgerald (Public Relations)
                                        Mylan Laboratories Inc.
                                        724.514.1800

                                        Kris King (Investor Relations)
                                        Mylan Laboratories Inc.
                                        724.514.1800

                       MYLAN LABORATORIES ANNOUNCES FINAL
           RESULTS OF ITS MODIFIED "DUTCH AUCTION" SELF TENDER OFFER
                        AND CLOSING OF RELATED FINANCING


PITTSBURGH, July 22, 2005 /PRNewswire-FirstCall/ - Mylan Laboratories Inc.
(NYSE:MYL) today announced the final results of its modified "Dutch Auction"
self tender offer, which expired at 12:00 midnight, New York City time, on
Friday, July 15, 2005. Mylan has accepted for payment an aggregate of
51,282,051 shares of its common stock at a purchase price of $19.50 per share.
These shares represent approximately 19% of the shares outstanding as of July
20, 2005. Mylan has been informed by the depositary for the tender offer that
the final proration factor for the tender offer is approximately 94.315%.

Based on the final count by the depositary for the tender offer (and excluding
any conditional tenders which were not accepted due to the specified condition
not being satisfied), 54,373,107 shares were properly tendered and not
withdrawn at or below a price of $19.50 per share. The 51,282,051 shares to be
purchased are comprised of the 48,780,487 shares Mylan offered to purchase and
2,501,564 shares to be purchased pursuant to Mylan's right to purchase up to an
additional 2% of the outstanding shares as of June 14, 2005, without extending
the tender offer in accordance with applicable securities laws.

All shares tendered and delivered at prices between $19.75 and $20.50 per share
will be returned promptly to shareholders by the depositary. In addition, based
on the final count, 3,091,056 shares were tendered at prices of $19.50 or below
and will be returned promptly to shareholders by the depositary as a result of
proration.

The depositary will promptly pay for the shares accepted for purchase. With
completion of the tender offer, Mylan now has approximately 218,601,952 shares
of common stock outstanding.

Mylan also announced today the closing of the sale of its 5-3/4% Senior Notes
due 2010 ($150 million aggregate principal amount) and its 6-3/8% Senior Notes
due 2015 ($350 million aggregate principal amount) to qualified institutional
buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the
"Securities Act"), and to persons outside the United States under Regulation S
of the Securities Act. In addition, Mylan today entered into a $500 million
senior secured credit facility with Merrill Lynch Capital Corporation, as
administrative agent, and a syndicate of banks.

The notes have not been registered under the Securities Act or securities laws
of any state and may not be offered or sold in the United States absent
registration or an applicable exemption from registration requirements under
the Securities Act or the laws of any state. This press release shall not
constitute an offer to sell or a solicitation of an offer to buy such notes in
any jurisdiction in which such an offer or sale would be unlawful and the
information relating to such notes is issued pursuant to Rule 135c under the
Securities Act.

Merrill Lynch & Co. acted as the dealer manager for the tender offer.

For questions and information about the tender offer, please contact the 
information agent, Morrow & Co., Inc., toll free at 1-800-607-0088.


About Mylan Laboratories

Mylan Laboratories Inc. is a leading pharmaceutical company with three
principal subsidiaries, Mylan Pharmaceuticals Inc., Mylan Technologies Inc. and
UDL Laboratories, Inc., that develop, license, manufacture, market and
distribute an extensive line of generic and proprietary products.