 On May 2, 2011, Teva Pharmaceutical Industries announced it would acquire Cephalon.The company's early research efforts were focused on the development of IGF-1, an insulin-like growth factor, in collaboration with Chiron Corporation, toward the development of a treatment for amyotrophic lateral sclerosis (Lou Gehrig's Disease), a candidate that was never approved.Thereafter, the company developed and commercialized products for the treatment of sleep disorders, pain, addiction and cancer, establishing the "wake franchise" on the basis of Provigil (modafinil) and later, Nuvigil, the "R"-enantiomer of modafinil.