Questcor Pharmaceuticals, Inc. was founded in 1990 and is headquartered in Union City, California. Questcor Pharmaceuticals, Inc., a specialty pharmaceutical company, provides prescription drugs for central nervous system disorders. The company markets H.P. Acthar Gel (repository corticotropin injection), an injectable drug that is approved for the treatment of certain disorders with an inflammatory component, including the treatment of exacerbations associated with multiple sclerosis, and the treatment of nephrotic syndrome. H.P. Acthar Gel is also used in treating patients with infantile spasms, a rare form of refractory childhood epilepsy; and opsoclonus myoclonus syndrome, a rare autoimmune-related childhood neurological disorder. The company also markets Doral (quazepam), which is indicated for the treatment of insomnia characterized by difficulty in falling asleep, frequent nocturnal awakenings, and/or early morning awakenings.