Study to Assess the Efficacy, Safety, Tolerability, and Pharmacokinetics of BIIB033 in Participants With Relapsing Forms of Multiple Sclerosis When Used Concurrently With Avonex

Conditions

• Multiple Sclerosis

Interventions

• DRUG: BIIB033
• OTHER: Placebo
• DRUG: Avonex

Sponsor

Biogen