Achillion Pharmaceuticals, Inc., a biopharmaceutical company, discovers, develops, and commercializes anti-infective drug therapies in the United States and internationally. It focuses on developing combination therapies for the treatment of chronic hepatitis C (HCV) infection and drug-resistant bacterial infections. The company’s drug candidates for treating chronic HCV infection comprise ACH-3102, a NS5A inhibitor, which completed Phase IIa clinical trials; ACH-3422, a NS5B nucleotide polymerase inhibitor that is in Phase I clinical development; and Sovaprevir, a NS3 protease inhibitor, which completed Phase II clinical trial. It has a license and development agreement with Ora, Inc. for the development and commercialization of ACH-702, an antibacterial drug candidate that is delivered topically or locally; and license and collaboration arrangement with Janssen Pharmaceuticals Inc. to develop and commercialize the company’s hepatitis C virus assets. The company was founded in 1998 and is headquartered in New Haven, Connecticut.