Suvecaltamide is being tested in a study to see if it helps with tremors in people with Parkinson's Disease (PD). Tremors are shaky movements that some people with PD can't control with their medication. The study lasts up to 23 weeks, including a few different periods for testing and observation. **Parkinson's Disease (PD)** is a disorder that affects movement. People with PD may have symptoms like slow movement (bradykinesia) and stiff muscles (rigidity). This study focuses on people whose tremors are not well managed by current PD medicines and affect their daily lives. Participants will be randomly assigned to receive either suvecaltamide or a placebo (a fake treatment) to compare results. The study uses a special scale called TETRAS to measure the tremor severity before and after treatment. **Key Points:** - The study lasts up to 23 weeks; treatment is 17 weeks. - Participants must have moderate to severe tremors that disrupt daily activities. - Certain health conditions and medications may prevent participation. This study helps researchers understand if suvecaltamide can improve tremor symptoms safely in people with PD.