EXHIBIT 99.1

                                  CERTIFICATION



Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C.ss. 1350, as
adopted), Richard P. Thompson, Chief Executive Officer of Aradigm Corporation
(the "Company"), and Thomas C. Chesterman, Chief Financial Officer of the
Company, each hereby certify that, to the best of their knowledge:

1. The Company's Quarterly Report on Form 10-Q for the period ended March 31,
2003, to which this Certification is attached as Exhibit 99.1 (the "PERIODIC
REPORT") fully complies with the requirements of section 13(a) or section 15(d)
of the Securities Exchange Act of 1934, and

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

IN WITNESS WHEREOF, the undersigned have set their hands hereto as of the 9th
day of May 2003.


/s/ RICHARD P. THOMPSON                  /s/ THOMAS C. CHESTERMAN
---------------------------------        -----------------------------------
Chief Executive Officer                  Chief Financial Officer