"This study provides the final validation of Intraject as the system successfully delivered active drug," said Dr. Bryan Lawlis, Aradigm's President and Chief Executive Officer. "We have funded this program to date in order to demonstrate conclusively that Intraject needle-free delivery is a viable replacement for conventional subcutaneous injection, and to accelerate our path to first product launch. In the first half of 2005, we anticipate manufacturing registration lots and preparing for pivotal bioequivalence trials in the second half of the year. We are encouraged that our rapid progress is generating attractive partnering prospects for this product, as well as for other products that are currently marketed or being developed for subcutaneous delivery."

The trial was a randomized, open-label, single-dose, crossover study evaluating the pharmacokinetics of sumatriptan at three injection sites in 18 healthy adult male and female volunteers. Subjects were randomized to receive sumatriptan both by Intraject and by the currently marketed subcutaneous needle-injected sumatriptan product into the abdomen, thigh, and arm.

The comparability of Intraject to the subcutaneous needle-injected sumatriptan product was established at all three injection sites using standard bioequivalence criteria of peak concentration achieved in blood plasma (Cmax), and total drug concentration in blood plasma achieved over time (AUC). Other pharmacokinetic measures were similar between Intraject and the needle-injected product, and there was no significant difference in blood levels between the two products.

"This positive data means that Intraject has the potential to be
competitively positioned in the $2 billion triptan market," said Dr. Stephen Farr, Senior Vice President and Chief Scientific Officer of Aradigm. "Rapid absorption is important for achieving rapid relief in the treatment of migraine attacks. To date, the performance of injected sumatriptan has not been equaled by any oral triptan. We expect that patients seeking faster pain relief will be pleased to have an effective option that does not involve a needle."

Aradigm develops non-invasive delivery systems to enable patients to comfortably self-administer biopharmaceuticals and small molecules that would otherwise be given by injection. The company's advanced AERx(R) pulmonary and Intraject(R) needle-free delivery technologies offer rapid delivery solutions for liquid drug formulations. Current development programs focus on neurological disorders, heart disease, respiratory conditions and cancer. More information about Aradigm can be found at http://www.aradigm.com.

Except for the historical information contained herein, this news release contains forward-looking statements that involve risk and uncertainties, including clinical results, the timely availability and acceptance of new products, the impact of competitive products and pricing, and the management of growth, as well as the other risks detailed from time to time in Aradigm Corporation's Securities and Exchange Commission (SEC) Filings, including the company's Annual Report on Form 10-K, and quarterly reports on Form 10-Q.