The goal of this study is to evaluate how safe and effective the new study drug BIIB122 is for the treatment of participants with early stage Parkinson’s disease. The study compares the effect of the study drug BIIB122 with the effect of a placebo (a drug without an active ingredient, a 'fake drug'). The study drug is administered orally.
Early stage Parkinson's disease
55 to 151 weeks
Amsterdam and Zwolle