Testing VIM0423 for shaking not controlled by usual medicine

Vista PD is a randomized, placebo-controlled, multicenter study to evaluate the efficacy, PK, safety, and tolerability of VIM0423 in adults with Parkinson's disease tremor insufficiently responsive to dopaminergic therapy. The main objectives of this clinical trial are to determine the following: * Does VIM0423 therapy improve tremor symptoms in adults with Parkinson's disease? * Is VIM0423 well tolerated in individuals with Parkinsons's disease? and * Do the therapeutic effects of VIM0423 confer improvements on daily function and quality of life?

Parkinson's disease (PD) is the second most common neurodegenerative condition, with studies estimating US prevalence among individuals aged 45 years and older rising to approximately 1,238,000 by 2030. More than 75% of individuals with PD will experience resting tremor at some point during their disease course, and approximately 60% additionally suffer from a symptomatic tremor during action or movement, complicating functional tasks. The distress caused by PD tremor is profound, with individuals consistently identifying it as their "most bothersome" symptom in early disease, and more impactful than other motor and nonmotor symptoms. Despite the clear importance of this symptom to patient experience, significant unmet need in tremor management persists. Tremor-specific efficacy of dopaminergic therapy, the mainstay of early PD pharmacology, is often inconsistent or incomplete, giving rise to the clinical concept of "dopamine-responsive" versus "dopamine-refractory" tremor. Anti-tremor efficacy of anticholinergic agents has been recognized for decades; however, their clinical utility is limited by both central and peripheral adverse effects VIM0423 is being developed as an oral medication designed to improve the central and peripheral tolerability seen with other anticholinergic medications. Vista PD (Study VIM0423-251) is a Phase 2, multicenter study designed to assess the efficacy, PK, safety, and tolerability of VIM0423 in adults with Parkinson's disease tremor insufficiently responsive to dopaminergic therapy. Up to 80 individuals will be enrolled in the trial. Cohort 1 will be comprised of adults diagnosed with PD who are on stable and adequate dopaminergic therapy (oral levodopa or oral dopamine agonist only), with residual tremor. Participants in Cohort 1 will be randomized (1:1) to receive either VIM0423 or matching placebo (up to 5 pills a day\[MO1.1\]\[TG1.2\]\[MO1.3\], taken once daily) for 7 weeks. The Investigator and Participant will not know whether \[MO2.1\]patients are receiving VIM0423 or placebo, but that information will be available if needed. Cohort 2 will be comprised of adults diagnosed with PD who are dopaminergic naïve, as defined by: no prior or ongoing usage of levodopa (in any form) or dopamine agonist (in any form), and no anticipated plans to initiate said therapies for the duration of the study. Participants in Cohort 2 will be randomized (1:1) to receive either VIM0423 or matching placebo (up to 5 pills a day\[MO3.1\], taken once daily) for 7 weeks. The Investigator and Participant will not know whether patients are receiving VIM0423 or placebo, but that information will be available if needed. The total time of participation in the trial is up to 12 weeks and requires 6 in person visits. The study schedule includes Screening and Baseline (up to 4 weeks, 2 visits), Treatment period (including taper, 7 weeks, 3 Visits), and Safety follow-up (1 week, 1 Visit). Assessments of changes in Parkinson's disease will be made by study personnel. Clinical labs, EKGs, and Adverse events will be monitored throughout the study. Participants will be asked to use a wearable device during the study and perform self-assessments of their Parkinson's tremor and its impact on their activities of daily living.