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Clinical Trial Summary

Patients with Parkinson's disease (PD) sometimes experience symptoms affecting their movement, such as slowness, tremor, stiffness, and balance or walking problems. Many patients also have other symptoms not related to movement, called non-motor symptoms, which may affect one's mood or emotions, memory or thinking, or cause one to see or hear things that aren't real (hallucinations) or believe things that aren't true (delusions). Hallucinations or delusions, together called psychosis, occur in up to 60% of PD patients at some point in time. Parkinson's disease psychosis can sometimes be associated with decreased quality of life, increased nursing home placement, increased rate of death, and greater caregiver burden. There are approximately 50,000 Veterans with Parkinson's disease receiving care in the VA, and up to 30,000 (60%) of them will experience psychosis at some point in time. Quetiapine is an antipsychotic drug approved by the Food and Drug Administration (FDA) that is the most commonly used medication to treat PD psychosis, but more studies are needed to determine if it works for this condition and is also well tolerated and safe. Pimavanserin is a newer antipsychotic drug approved by the Food and Drug Administration (FDA) specifically to treat PD psychosis, but more studies are needed to determine if it works and its safety. The purpose of this research is to gather additional information on the safety and effectiveness of both Quetiapine and Pimavanserin. By doing this study, the investigators hope to learn which of these medications is the most effective course of treatment for people with PD psychosis.


Clinical Trial Description

n/a


Study Design


Related Conditions & MeSH terms


NCT number NCT04373317
Study type Interventional
Source VA Office of Research and Development
Contact Daniel Weintraub, MD
Phone (215) 823-5800
Email daniel.weintraub@va.gov
Status Recruiting
Phase Phase 4
Start date October 24, 2022
Completion date August 24, 2026

See also
  Status Clinical Trial Phase
Recruiting NCT06068465 - A Study of the Safety and Efficacy of Pimavanserin in Patients With Parkinson's Disease Psychosis Phase 3
Completed NCT01518309 - An Open-label Safety Study of Pimavanserin in Parkinson's Disease Patients Phase 2
Completed NCT00658567 - A Study of Safety and Efficacy of Pimavanserin (ACP-103) in Patients With Parkinson's Disease Psychosis Phase 3
Completed NCT00477672 - A Study of the Safety and Efficacy of Pimavanserin (ACP-103) in Patients With Parkinson's Disease Psychosis Phase 3
Completed NCT01174004 - A Study of the Safety and Efficacy of Pimavanserin in Patients With Parkinson's Disease Psychosis Phase 3
Completed NCT00550238 - A Study of the Safety and Tolerability of Pimavanserin (ACP-103) in Patients With Parkinson's Disease Psychosis Phase 3
Recruiting NCT05590637 - Comparing Antipsychotic Medications in LBD Over Time Phase 4
Approved for marketing NCT02762591 - Expanded Access of Pimavanserin for Patients With PD Psychosis N/A