( ing its product candidates; thecompany...)Valopicitabine Combined with Standard of Care Cleared Hepatitis C,Virus in 72% of Patients Who Completed 12 Weeks of Treatment in a,Phase II Trial,Health

ing its product candidates; the company's ability to obtain additional funding required to conduct its research, development and commercialization activities; the company's dependence on its collaboration with Novartis Pharma AG; the ability of the company to attract and retain qualified personnel; competition in general; the company's ability to obtain, maintain and enforce patent and other intellectual property protection for its product candidates and its discoveries and the Company's ability to accurately assess the market. These and other risks which may impact management's expectations are described in greater detail under the caption "Risk Factors" in the company's annual report on Form 10-K for the year ended December 31, 2006 and filed with the Securities and Exchange Commission, the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2007 and other filings that the company makes with the Securities and Exchange Commission.

All forward-looking statements reflect the company's expectations only as of the date of this release and should not be relied upon as reflecting the company's views, expectations or beliefs at any date subsequent to the date of this release. Idenix anticipates that subsequent events and developments may cause these views, expectations and beliefs to change. However, while Idenix may elect to update these forward-looking statements at some point in the future, it specifically disclaims any obligation to do so.

(1) Center For Disease Control National Prevention Strategy.

(2) Center for Disease Control. Hepatitis C Fact Sheet accessed online at http://www.cdc.gov/ncidod/diseases/hepatitis/c/fact.htm.

(3) Davis, G. et al., Projecting Future Complications of Chronic Hepatitis C in the United States. Liver Transplantation, April 2003.

Idenix Pharmaceuticals' Contacts:

Media: Teri Dahlman (617) 99
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