EXHIBIT  32.1

CERTIFICATION OF PRESIDENT AND CHIEF EXECUTIVE OFFICER



                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Pharmaceutical  Resources,  Inc. (the
"Company")  on Form 10-Q for the period ended  September  28, 2003 as filed with
the Securities  and Exchange  Commission on the date hereof (the  "Report"),  I,
Scott L. Tarriff, President and Chief Executive Officer of the Company, certify,
pursuant to 18 U.S.C.  Section 1350,  as adopted  pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that, to my knowledge:

      (1)  The Report fully complies with the  requirements  of Section 13(a) of
           the Securities Exchange Act of 1934; and

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



/s/ SCOTT L. TARRIFF
- --------------------
Scott L. Tarriff
President and Chief Executive Officer
November 12, 2003