Overview
The purpose of this study is to evaluate the efficacy, safety, and pharmacokinetics (PK) of prasinezumab compared with placebo in participants with early-stage Parkinson's disease (PD) on stable symptomatic monotherapy with levodopa.
Eligibility
Inclusion Criteria:
- Body weight within 40-110 kilograms (kg) (88-242 pounds \[lbs\]) and a body mass index within the range 18-34 kg/m2
- Diagnosis of idiopathic PD based on Movement Disorder Society (MDS) criteria
- Has received monotherapy treatment
- An MDS-UPDRS Part IV score of 0 at screening and prior to randomization
- Hoehn and Yahr (H\&Y) Stage 1 or 2 off medication at screening and prior to randomization
- Agreement to adhere to the contraception requirements
Exclusion Criteria:
- Pregnant or breastfeeding, or intention of becoming pregnant during the study or within the time frame in which contraception is required
- Medical history indicating a parkinsonian syndrome other than idiopathic PD
- Diagnosis of a significant neurologic disease other than PD
- Chronic uncontrolled hypertension