Exhibit 23.1

CONSENT OF INDEPENDENT ACCOUNTANTS

        We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 333-50038 and No. 333-65518) of Aerogen, Inc. of our reports, dated February 3, 2003 relating to the consolidated financial statements and financial statement schedule, which appear in this Annual Report on Form 10-K.

/s/ PricewaterhouseCoopers LLP

San Jose, California
March 26, 2003