Forward-Looking Statements

This press release includes "forward-looking statements" made under the provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include statements other than statements of historical fact. In some cases, words such as "will," "expect" or other comparable words identify forward-looking statements. Actual results, performance or experience may differ materially from those expressed or implied by any forward-looking statement as a result of various important factors, including without limitation risks and uncertainties relating to Achillion's business and financial condition, general market conditions, the satisfaction of customary closing conditions associated with the public offering, and the impact of general economic, industry or political conditions in the United States or internationally. Risks and uncertainties that Achillion faces are described in greater detail under the heading "Risk Factors" in its 2012 Annual Report on Form 10-K and its subsequent SEC filings, as well as other filings that it makes with the SEC. As a result of the risks and uncertainties, the results or events indicated by any forward-looking statement may not occur. Achillion cautions you not to place undue reliance on any forward-looking statement.

In addition, any forward-looking statement in this press release represents Achillion's views only as of the date of this press release and should not be relied upon as representing its views as of any subsequent date. Achillion disclaims any obligation to update any forward-looking statement, except as required by applicable law.
CONTACT: Company Contact:         Glenn Schulman         Achillion Pharmaceuticals, Inc.         Tel. (203) 624-7000         gschulman@achillion.com                  Investors:         Mary Kay Fenton         Achillion Pharmaceuticals, Inc.         Tel. (203) 624-7000         mfenton@achillion.com                  Media:         Christin Culotta Miller         Ogilvy PR         Tel. (212) 880-5264         christin.miller@ogilvy.com                  Investors:         Seth Lewis         The Trout Group, LLC         Tel. (646) 378-2952         slewis@troutgroup.com

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