NEW HAVEN, Conn., June 29, 2009 (GLOBE NEWSWIRE) -- Achillion Pharmaceuticals, Inc. (Nasdaq:ACHN), a leader in the discovery and development of small molecule drugs to combat the most challenging infectious diseases, today announced that the Company has begun dosing in a Phase I clinical trial of ACH-1625, a protease inhibitor for the treatment of hepatitis C virus (HCV) infection.