This study tests prasinezumab, a medicine given through a vein (IV), for people with early-stage Parkinson's disease (PD). PD is a brain disorder that affects movement. Participants will either receive prasinezumab or a placebo (a harmless pill or injection that looks like the medicine but isn't) to see if it helps treat PD. This study also checks if the medicine is safe and how it moves in the body, called pharmacokinetics (PK). To join, you must weigh between 88-242 pounds and have a PD diagnosis. You should also already be taking levodopa, a common PD medicine.
- Length and Visits: Participants will have multiple visits over the study period.
- Compensation: Some form of compensation may be provided for participation.
- Risks: Possible side effects from the medicine and IV procedure.
Not everyone can join. If you have other serious health problems or are pregnant, you can't participate. If you're interested, talk to your doctor to see if this study is right for you!