EXHIBIT 99.1

           PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
       (SUBSECTIONS (a) AND (b) OF SECTION 1350, CHAPTER 63 OF TITLE 18,
                              UNITED STATES CODE)


     Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a)
and (b) of section 1350, chapter 63 of title 18, United States Code), each of
the undersigned officers of ARIAD Pharmaceuticals, Inc., a Delaware corporation
(the "Company") does hereby certify, to such officer's knowledge, that:

     The Annual Report on Form 10-K for the year ended December 31, 2002 (the
"Form 10-K") of the Company fully complies with the requirements of section
13(a) or 15(d) of the Securities Exchange Act of 1934, and information contained
in the Form 10-K fairly presents, in all material respects, the financial
condition and results of operations of the Company.

  Date:  March 14, 2003                 /s/ Harvey J. Berger, M.D.

                                        __________________________
                                        Harvey J. Berger, M.D.
                                        Chairman, Chief Executive Officer
                                        and President


  Date:  March 14, 2003                 /s/ Edward M. Fitzgerald

                                        ___________________________
                                        Edward M. Fitzgerald
                                        Senior Vice President and Chief
                                        Financial Officer


The foregoing certification is being furnished solely pursuant to section 906 of
the Sarbanes-Oxley Act of 2002 (subsections (s) and (b) of section 1350, chapter
63 of title 18, United States Code) and is not being filed as part of a separate
disclosure document.