Cephalon has a handful of powerful specialty drugs. The company's research, development, manufacturing, and marketing activities focus on therapies for central nervous system (CNS) disorders, cancer, pain, and inflammatory disease. Its NUVIGIL and PROVIGIL drugs treat the sleep disorder narcolepsy. The company's other top sellers are cancer drug TREANDA, cancer pain medications ACTIQ and FENTORA, epilepsy treatment GABITRIL, and muscle relaxant AMRIX. Its eight major products are primarily sold in the US and Europe. Cephalon was acquired by top generic drugmaker Teva Pharmaceutical Industries in 2011.