Mr. Kishbauch further commented, "With the initiation of this all-oral 12-week study evaluating ACH-3102 and ribavirin for the treatment of HCV genotype 1b, we have rapidly advanced our portfolio and believe the attributes of ACH-3102, as well as sovaprevir, our Phase 2 protease inhibitor, have the potential to provide optimized compounds for the broad treatment of HCV."

Analyst Day Webcast

Achillion is hosting its inaugural Analyst Day and simultaneous webcast on Thursday, September 27, 2012 at 1:00 p.m. Eastern Time. To access a copy of the presentation and the live audio webcast of the event, please visit www.achillion.com . Please connect to Achillion's website several minutes prior to the start of the broadcast to ensure adequate time for any software download that may be necessary. A replay of the webcast will be available on www.achillion.com beginning approximately 2 hours after the conclusion of the event.

About HCV

The hepatitis C virus is the most common cause of viral hepatitis, which is an inflammation of the liver. It is currently estimated that more than 170 million people are infected with HCV worldwide including more than 5 million people in the United States, more than twice as widespread as HIV. Three-fourths of the HCV patient population is undiagnosed; it is a silent epidemic and a major global health threat. Chronic hepatitis, if left untreated, can lead to permanent liver damage that can result in the development of liver cancer, liver failure or death. Few therapeutic options currently exist for the treatment of HCV infection. The current standard of care is limited by its specificity for certain types of HCV, significant side-effect profile, and injectable route of administration.

About Achillion Pharmaceuticals

Achillion is an innovative pharmaceutical company dedicated to bringing important new treatments to patients with infectious disease. Achillion's proven discovery and development teams have advanced multiple product candidates with novel mechanisms of action. Achillion is focused on solutions for the most challenging problems in infectious disease including HCV and resistant bacterial infections. For more information on Achillion Pharmaceuticals, please visit www.achillion.com or call 1-203-624-7000.

Forward-Looking Statements

This press release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks, uncertainties and other important factors that could cause actual results to differ materially from those indicated by such forward-looking statements, including statements with respect to the favorable activity and potential benefits of ACH-3102 and sovaprevir, and expectations about milestone achievement including the potential to report RVR results during the fourth quarter of 2012. Among the factors that could cause actual results to differ materially from those indicated by such forward-looking statements are risks relating to, among other things, Achillion's ability to: replicate in later clinical trials the positive results found in nonclinical studies and earlier stage clinical studies of sovaprevir, ACH-2684, and ACH-3102; advance the development of its drug candidates under the timelines it anticipates in current and future clinical trials; obtain necessary regulatory approvals; obtain patent protection for its drug candidates and the freedom to operate under third party intellectual property; establish commercial manufacturing arrangements; identify, enter into and maintain collaboration agreements with appropriate third-parties; compete successfully with other companies that are seeking to develop improved therapies for the treatment of HCV; manage expenses; and raise the substantial additional capital needed to achieve its business objectives. These and other risks are described in the reports filed by Achillion with the U.S. Securities and Exchange Commission, including its Annual Report on Form 10-K for the fiscal year ended December 31, 2011 and its subsequent SEC filings.

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