ANAHEIM, Calif., Oct. 15 /PRNewswire-FirstCall/ -- Questcor Pharmaceuticals, Inc. (Nasdaq:QCOR - News) today announced the U.S. Food and Drug Administration (FDA) has approved Questcor's supplemental new drug application (sNDA) for H.P. Acthar® Gel (repository corticotropin injection) in the treatment of infantile spasms (IS), an ultra-rare orphan disorder affecting approximately 2,000 American children annually. IS is a devastating and potentially life-threatening form of epilepsy seen in infancy and early childhood.