Where is qualitest pharmaceuticals located? Qualitest Pharmaceuticals is headquartered in Huntsville, Alabama with manufacturing facilities in Charlotte, North Carolina, and Huntsville. Endo Pharmaceuticals agreed to buy the company in 2010. Today Qualitest Pharmaceuticals has an extensive portfolio of over 600 drugs.Where are qualqualitest products made? Qualitest Pharmaceuticals is headquartered in Huntsville, Alabama with manufacturing facilities in Charlotte, North Carolina, and Huntsville. Endo Pharmaceuticals agreed to buy the company in 2010.Is qualitest pharmaceuticals owned by endo? Qualitest Pharmaceuticals is an American pharmaceutical company that produces generic drugs. Qualitest Pharmaceuticals is headquartered in Huntsville, Alabama with manufacturing facilities in Charlotte, North Carolina, and Huntsville. Endo Pharmaceuticals agreed to buy the company in 2010.Is qualitest a big company? Qualitest is the sixth largest U.S. generics company as measured by prescriptions filled. Founded in 1983, Qualitest is the sixth largest U.S. generics company as measured by prescriptions filled. The company’s broad range of generics encompasses 175 product families.