Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

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 (Responsible Party):
ACADIA Pharmaceuticals Inc. Identifier:
First received: April 10, 2008
Last updated: April 18, 2017
Last verified: April 2017
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
Intervention Model: Parallel Assignment
Masking: Participant, Care Provider, 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 [ Time Frame: Each study visit (i.e. Days 1, 8, 15, 29 and 42) ]

    Antipsychotic efficacy was defined as a decrease in the severity and/or frequency of hallucinations and/or delusions. This is measured as the change from baseline (Day 1) to Day 42 in the Scale for the Assessment of Positive Symptoms - Hallucinations and Delusions scales (SAPS-H+D) score for the ITT Analysis Set. The possible total score is 1 to 100 and a negative change in score indicates improvement.

    Analysis Method: Analysis of Covariance (ANCOVA) and missing data was imputed using Last Observation Carried Forward (LOCF) method.

Secondary Outcome Measures:
  • Motor Symptoms Change From Baseline (Negative = Improvement) [ Time Frame: Each study visit (i.e. Days 1, 8, 15, 29 and 42) ]

    Motor symptoms were measured using the change from baseline (Day 1) to Day 42 in the combined score of the Unified Parkinson's Disease Rating Scale (UPDRS) Part II (Activities of Daily Living) and Part III (Motor Examination). The total possible score is 0 to 160 and a negative change in score indicates improvement.

    Analysis Method: ANCOVA, and missing data was imputed using LOCF method. The UPDRS Parts II+III score was analyzed by constructing 2-sided 95% confidence intervals (CIs) on the difference between each pimavanserin dose group and placebo mean change from baseline. Non-inferiority was concluded if the upper limit of the CI was less than or equal to 5.

Enrollment: 123
Study Start Date: March 2008
Study Completion Date: December 2009
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: Placebo
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   (Adult, Senior)
Sexes Eligible for Study:   All
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, hematologic 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 identifier: NCT00658567

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

Responsible Party: ACADIA Pharmaceuticals Inc. Identifier: NCT00658567     History of Changes
Other Study ID Numbers: ACP-103-014
Study First Received: April 10, 2008
Results First Received: February 6, 2014
Last Updated: April 18, 2017
Individual Participant Data  
Plan to Share IPD: No

Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No

Additional relevant MeSH terms:
Parkinson Disease
Psychotic Disorders
Mental Disorders
Parkinsonian Disorders
Basal Ganglia Diseases
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Movement Disorders
Neurodegenerative Diseases
Schizophrenia Spectrum and Other Psychotic Disorders
Antiparkinson Agents
Anti-Dyskinesia Agents
Serotonin 5-HT2 Receptor Agonists
Serotonin Receptor Agonists
Serotonin Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs processed this record on May 24, 2017