Pharmasset to Present at Two Upcoming Conferences

PRINCETON, N.J., May 14, 2011 /PRNewswire/ -- Pharmasset, Inc. (Nasdaq: VRUS) announces that management will present at the Nobel Financial Conference to be held May 16 to 17, 2011 at the Hard Rock Hotel and Casino, Hollywood, Florida and the ThinkEquity Conference to be held May 25, 2011 at the Princeton Club, NY. Patrick Higgins, Pharmasset's Executive Vice President of Sales and Marketing, will provide an overview of the company at the Nobel Financial Conference on Monday, May 16, 2011 at 10:00 AM (ET) and at the ThinkEquity Conference on May 25, 2011 at 10:30 AM (ET).

To access a simultaneous webcast of Mr. Higgins' overview via the internet, log on to the "Events & Presentations" section of the Investor Center on Pharmasset's website at http://investor.pharmasset.com/events.cfm. Please connect to the website at least ten minutes prior to the start of the presentation to ensure adequate time for a reliable connection and any software download that may be necessary for the webcast.

A replay of the webcasts will be available on Pharmasset's website for thirty days following the conference. The investor presentation will be available for download in PDF format immediately following the presentation in the "Events & Presentations" section of the Investor Center on Pharmasset's website at http://investor.pharmasset.com/events.cfm.

About Pharmasset

Pharmasset is a clinical-stage pharmaceutical company committed to discovering, developing, and commercializing novel drugs to treat viral infections. Pharmasset's primary focus is development of oral therapeutics for the treatment of hepatitis C virus (HCV) infection. Our research and development efforts are focused on nucleoside/tide analogs, a class of compounds which act as alternative substrates for the viral polymerase, thus inhibiting viral replication. We currently have three clinical-stage product candidates advancing in trials in various populations. Our purine, PSI-7977, an unpartnered uracil nucleotide analog, is currently under study in three Phase 2b trials in patients with HCV genotypes 1 through 6, including abbreviated duration interferon and interferon-free regimens. Our purine, PSI-938, an unpartnered guanosine nucleotide analog, recently reported safety and efficacy data from 14 days of monotherapy as well as 14 days in combination with the pyrimidine, PSI-7977. An SVR-endpoint study of the purine-pyrimidine combination is anticipated to begin mid-year. Mericitabine (RG7128), continues in two Phase 2b trials and one interferon-free trial conducted through a strategic collaboration with Roche.

   Contact
       Richard E. T. Smith, Ph.D.
       VP, Investor Relations and Corporate Communications
       Office: +1 (609) 865-0693

Forward-Looking Statements

Pharmasset "Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Statements in this press release that are not historical facts are "forward-looking statements," that involve risks, uncertainties, and other important factors, including, without limitation, the risk of cessation or delay of any of the ongoing or planned clinical trials and/or our development of our product candidates, the risk that the results of previously conducted studies involving our product candidates will not be repeated or observed in ongoing or future studies involving our product candidates, the risk that our collaboration with Roche will not continue or will not be successful, and the risk that any one or more of our product candidates will not be successfully developed and commercialized. For a discussion of risks, uncertainties, and other important factors, any of which could cause our actual results to differ from those contained in the forward-looking statements, see the section entitled "Risk Factors" in our Annual Report on Form 10-K for the fiscal year ended September 30, 2010 and our Quarterly Reports on Form 10-Q filed with the Securities and Exchange Commission and discussions of potential risks, uncertainties, and other important factors in our subsequent filings with the Securities and Exchange Commission.

SOURCE Pharmasset, Inc.

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