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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-Q/A
                                 AMENDMENT NO. 1

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

                For the quarterly period ended SEPTEMBER 30, 2004

                                       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 1-9114

                             MYLAN LABORATORIES INC.

             (Exact name of registrant as specified in its charter)

                                        
                  Pennsylvania                  25-1211621
                   (State of                 (I.R.S. Employer
                 incorporation)             Identification No.)


                              1500 Corporate Drive
                         Canonsburg, Pennsylvania 15317
                    (Address of principal executive offices)
                                   (Zip Code)

                                 (724) 514-1800

              (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 twelve 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 [v] NO [ ]

Indicate by check mark whether the registrant is an accelerated filer (as
defined in Rule 12b-2 of the Exchange Act). YES [v] NO [ ]

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of the latest practicable date.



                          CLASS OF           OUTSTANDING AT
                        COMMON STOCK        NOVEMBER 1, 2004
                        ------------        ----------------
                                         
                       $0.50 par value        269,103,475

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                                EXPLANATORY NOTE

      Pursuant to this Form 10-Q/A, the registrant amends and restates "Part II
- Item 6" (Exhibits and Reports on Form 8-K) in its entirety to add certain
exhibits to subpart(a) that were inadvertently omitted from the original filing.
Other than the foregoing and the new certifications of the CEO and CFO of the
registrant, as required by Rule 12b-15 under the Securities Exchange Act of
1934, no other changes have been made to the Form 10-Q for the quarterly period
ended September 30, 2004. In order to preserve the nature and character of the
disclosures set forth in such Form 10-Q as originally filed, this Amendment No.
1 does not reflect events occurring after the filing of the original Quarterly
Report on Form 10-Q on November 8, 2004, or modify or update the disclosures
presented in the original Quarterly Report on Form 10-Q, except to reflect the
revisions as described above.



ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

a. Exhibits

     
2.1     Agreement and Plan of Merger dated as of July 23, 2004 by and among the
        registrant, Summit Merger Corporation and King Pharmaceuticals, Inc.,
        filed as Exhibit 99.1 to the Report on Form 8-K filed with the SEC 
        on July 26, 2004, and incorporated herein by reference.

3.1     Amended and Restated Articles of Incorporation of the registrant, as
        amended to date, filed as Exhibit 3.1 to the Form 10-Q for the quarterly
        period ending June 30, 2003, and incorporated herein by reference.

3.2     Bylaws of the registrant, as amended to date, filed as Exhibit 3.2 to
        the Form 10-Q for the quarterly period ending September 30, 2003, and
        incorporated herein by reference.

4.1(a)  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.

4.1(b)  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, and incorporated
        herein by reference.

10.27   Executive  Employment  Agreement,  dated  as  of  July  1,  2004,
        between  the registrant and Edward J. Borkowski.

10.28   Executive Employment Agreement, dated as of July 1, 2004, between the
        registrant and Louis J. DeBone.

10.29   Executive Employment Agreement, dated as of July 1, 2004, between the
        registrant and John P. O'Donnell.

10.30   Executive  Employment  Agreement,  dated  as  of  July  1,  2004,
        between  the registrant and Stuart A. Williams.

10.31   Form of Indemnification Agreement between the registrant and each
        Director of 10.31 the registrant.

31.1    Certification of CEO pursuant to Section 302 of the Sarbanes-Oxley Act
        of 2002.

31.2    Certification of CFO pursuant to Section 302 of the Sarbanes-Oxley Act
        of 2002.

32      Certification of CEO and CFO pursuant to Section 906 of the
        Sarbanes-Oxley Act of 2002.


b. Reports on Form 8-K


     On July 2, 2004, the Company filed a Report on Form 8-K regarding a motion
filed with the U.S. Court of Appeals for the D.C. Circuit.


     On July 26, 2004, the Company filed a Report on Form 8-K announcing the
Company had entered into an Agreement and Plan of Merger to acquire King
Pharmaceuticals, Inc.



                                        2

     On July 26, 2004, the Company filed a Report on Form 8-K announcing
earnings for the three months ended June 30, 2004.

     On August 16, 2004, the Company filed a Report on Form 8-K regarding an
amendment to the Rights Agreement between the Company and American Stock
Transfer & Trust Company.

     On August 18, 2004, the Company filed a Report on Form 8-K regarding an
update in its fentanyl litigation pending in the U.S. District Court for the
District of Columbia.

     On August 30, 2004, the Company filed a Report on Form 8-K regarding an
update in its "authorized generics" lawsuit against the FDA pending in the U.S.
District Court for the Northern District of West Virginia.

     On September 9, 2004, the Company filed a Report on Form 8-K regarding a
further amendment to the Rights Agreement between the Company and American Stock
Transfer & Trust Company.



                                    SIGNATURE

      Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this Report on Form 10-Q/A for the quarterly period
ended September 30, 2004, to be signed on its behalf by the undersigned
thereunto duly authorized.

                                                  MYLAN LABORATORIES INC.


December 2, 2004                                  /s/ Edward J. Borkowski
                                                  -----------------------
                                                  Edward J. Borkowski
                                                  Chief Financial Officer


                                       3





                                  EXHIBIT INDEX


EXHIBIT NO.   DESCRIPTION
-----------   -----------

          
2.1            Agreement and Plan of Merger dated as of July 23, 2004 by and
               among the registrant, Summit Merger Corporation and King
               Pharmaceuticals, Inc., filed as Exhibit 99.1 to the Report on
               Form 8-K filed by the registrant on July 26, 2004, and
               incorporated herein by reference.

3.1            Amended and Restated Articles of Incorporation of the registrant,
               as amended to date, filed as Exhibit 3.1 to the Form 10-Q for the
               quarterly period ending June 30, 2003, and incorporated herein by
               reference.

3.2            Bylaws of the Registrant, as amended to date, filed as Exhibit
               3.2 to the Form 10-Q for the quarterly period ending September
               30, 2003, and incorporated herein by reference.

4.1(a)         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.

4.1(b)         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, and incorporated herein by reference.

10.27          Executive  Employment  Agreement,  dated  as of  July  1,  2004,
               between  the registrant and Edward J. Borkowski.

10.28          Executive Employment Agreement, dated as of July 1, 2004, between
               the registrant and Louis J. DeBone.

10.29          Executive Employment Agreement, dated as of July 1, 2004, between
               the registrant and John P. O'Donnell.

10.30          Executive  Employment  Agreement,  dated  as of  July  1,  2004,
               between  the registrant and Stuart A. Williams.

10.31          Form of Indemnification Agreement between the registrant and each
               Director of the registrant.

31.1           Certification of CEO pursuant to Section 302 of the
               Sarbanes-Oxley Act of 2002.

31.2           Certification  of CFO  pursuant  to Section 302 of the
               Sarbanes-Oxley  Act of 2002.

32             Certification  of CEO and CFO  pursuant to Section  906 of the
               Sarbanes-Oxley Act of 2002.