1 EXHIBIT 23.1 CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS We consent to the incorporation by reference in the Prospectus constituting part of the Registration Statements on Form S-3 (No. 333-52081 and No. 333-72037) and the Registration Statement on Form S-8 (No. 333-15947, No. 333-62039 and No. 333-92169) of our report dated February 18, 2000, with respect to the financial statements of Aradigm Corporation included in the Annual Report (Form 10-K) for the year ended December 31, 1999, as amended. /s/ ERNST & YOUNG LLP Palo Alto, California March 27, 2000