Panacos Pharmaceuticals, Inc., a development stage biotechnology company, engages in the discovery and development of small-molecule oral drugs designed to treat human immunodeficiency virus (HIV) and other human viral diseases. The company’s discovery technologies focus on novel targets in the virus life cycle, including virus maturation and virus fusion. Its product pipeline includes second- and third-generation programs in HIV maturation inhibition. The company was founded in 1999 and is headquartered in Watertown, Massachusetts.