IDIX (MM)

Idenix Pharmaceuticals, Inc. (Nasdaq:IDIX) announced today that Idenix management will present a corporate overview at the 7th Annual JMP Securities Healthcare Conference on July 12, 2012 at 9:30 a.m. ET at the Peninsula New York, New York City.

The live and archived webcast of the company presentation can be accessed under "Events and Presentations" in the Idenix Investor Center at www.idenix.com. Please log in approximately 5-10 minutes before the event to ensure a timely connection. The archived replay will be available on the Idenix website for two weeks following the conference.

About Idenix

Idenix Pharmaceuticals, Inc., headquartered in Cambridge, Massachusetts, is a biopharmaceutical company engaged in the discovery and development of drugs for the treatment of human viral diseases. Idenix's current focus is on the treatment of patients with hepatitis C infection. For further information about Idenix, please refer to http://www.idenix.com.

CONTACT: Kelly Barry (617) 995-9033 (media)
         Teri Dahlman (617) 995-9807 (investors)