Phase 3 Extension Study of Dexpramipexole in ALS

Amyotrophic Lateral Sclerosis (ALS) is a rapidly progressive, degenerative disease of motor neurons in the brain and spinal cord that leads to muscle atrophy and spasticity in limb and bulbar muscles resulting in weakness and loss of ambulation, oropharyngeal dysfunction, weight loss, and ultimately respiratory failure. The purpose of this study is to collect long-term safety data from subjects with Amyotrophic Lateral Sclerosis (ALS) exposed to dexpramipexole.