A Study of Safety and Efficacy of Pimavanserin (ACP-103) in Patients With Parkinson's Disease Psychosis

This study has been completed.
Information provided by:
ACADIA Pharmaceuticals Inc.
ClinicalTrials.gov Identifier:
First received: April 10, 2008
Last updated: August 4, 2010
Last verified: August 2010

This study will evaluate the safety and efficacy of two dose levels of pimavanserin (ACP-103) compared to placebo in patients with Parkinson's disease psychosis.

Condition Intervention Phase
Parkinson's Disease Psychosis
Drug: Pimavanserin tartrate (ACP-103)
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment

Resource links provided by NLM:

Further study details as provided by ACADIA Pharmaceuticals Inc.:

Primary Outcome Measures:
  • Antipsychotic efficacy will be assessed using the scale for the assessment of Positive Symptoms (SAPS) [ Time Frame: 6 weeks ] [ Designated as safety issue: No ]

Estimated Enrollment: 240
Study Start Date: March 2008
Primary Completion Date: December 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 2
pimavanserin tartrate (ACP-103) 20 mg, tablet, once daily by mouth, 6 weeks
Drug: Pimavanserin tartrate (ACP-103)
20 mg, tablet, once daily by mouth, for six weeks
Placebo Comparator: 3
Placebo tablet, once daily by mouth, 6 weeks
Drug: Pimavanserin tartrate (ACP-103)
Placebo, tablet, once daily by mouth, for six weeks
Experimental: 1
pimavanserin tartrate (ACP-103) 10 mg, tablet, once daily by mouth, 6 weeks
Drug: Pimavanserin tartrate (ACP-103)
10 mg, tablet, once daily by mouth, for six weeks


Ages Eligible for Study:   40 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • A clinical diagnosis of Parkinson's disease with a minimum duration of 1 year
  • Presence of visual and/or auditory hallucinations, and/or delusions, occurring during the four weeks prior to study screening
  • Psychotic symptoms must have developed after Parkinson's disease diagnosis was established
  • Subject must be on stable dose of anti-Parkinson's medication for 1 month prior to Study Day 1 (Baseline) and during the trial
  • Subject that has received stereotaxic surgery for subthalamic nucleus deep brain stimulation must be at least 6 months post surgery and the stimulator settings must have been stable for at least 1 month prior to Study Day 1 (Baseline) and must remain stable during the trial
  • The subject is willing and able to provide consent
  • Caregiver is willing and able to accompany the subject to all visits

Exclusion Criteria:

  • Subject has a history of significant psychotic disorders prior to or concomitantly with the diagnosis of Parkinson's disease including, but not limited to, schizophrenia or bipolar disorder
  • Subject has received previous ablative stereotaxic surgery (i.e., pallidotomy and thalamotomy) to treat Parkinson's disease
  • Subject has current evidence of a serious and or unstable cardiovascular, respiratory, gastrointestinal, renal, mematologic or other medical disorder
  • Subject has had a myocardial infarction in last six months
  • Subject has any surgery planned during the screening, treatment or follow-up periods

Patients will be evaluated at screening to ensure that all criteria for study participation are met. These evaluations will include specific measures of psychosis severity, delirium, dementia, cardiovascular condition, and pregnancy status. Patients may be excluded from the study based on these assessments (and specifically if it is determined that their baseline health and psychiatric condition do not meet all protocol-specified entry criteria).

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00658567

  Show 50 Study Locations
Sponsors and Collaborators
ACADIA Pharmaceuticals Inc.
  More Information

No publications provided

Responsible Party: Roger Mills, Executive Vice President, Development, ACADIA Pharmaceuticals Inc.
ClinicalTrials.gov Identifier: NCT00658567     History of Changes
Other Study ID Numbers: ACP-103-014
Study First Received: April 10, 2008
Last Updated: August 4, 2010
Health Authority: United States: Food and Drug Administration

Additional relevant MeSH terms:
Parkinson Disease
Mental Disorders
Psychotic Disorders
Parkinsonian Disorders
Basal Ganglia Diseases
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Movement Disorders
Neurodegenerative Diseases
Schizophrenia and Disorders with Psychotic Features
Antiparkinson Agents
Anti-Dyskinesia Agents
Central Nervous System Agents
Therapeutic Uses
Pharmacologic Actions
Serotonin 5-HT2 Receptor Agonists
Serotonin Receptor Agonists
Serotonin Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs

ClinicalTrials.gov processed this record on August 18, 2014