Biogen Inc (Biogen) is a biopharmaceutical company that discovers, develops, and delivers drugs and biosimilars for the treatment of various neurological and neurodegenerative diseases. The company’s marketed products include Avonex (interferon beta-1a), Tysabri (natalizumab), Tecfidera (dimethyl fumarate), Fampyra (prolonged-release fampridine tablets), and Plegridy (peginterferon beta-1a) for the treatment of multiple sclerosis (MS); Spinraza (nusinersen) for spinal muscular atrophy (SMA); and Fumaderm (fumaric acid esters) for severe plaque psoriasis. It has several product candidates targeting various indications such as MS, Parkinson’s disease, CNS and neuromuscular disorders, Alzheimer’s disease, and idiopathic pulmonary fibrosis and stroke. The company sells its products through direct sales force, marketing groups, and distributors in the Americas, Europe, Asia, and other territories. Biogen is headquartered in Cambridge, Massachusetts, US.