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ClinicalTrials.gov public records Last synced Oct 16, 2026, 10:16 PM EDT

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Showing 1–24 of 38 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Pimavanserin Clear all
Terminated Phase 2 Interventional Results available

Study to Examine the Safety and Efficacy of Pimavanserin for the Treatment of Agitation and Aggression in Alzheimer's Disease (SERENE)

NCT02992132
View directory record Official record
Conditions
Agitation and Aggression in Alzheimer's Disease
Interventions
Pimavanserin 34 mg, Pimavanserin 20 mg, Placebo
Drug · Other
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
50 Years and older
Enrollment
111 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
33
States / cities
Costa Mesa, California • Fresno, California • Fullerton, California + 30 more
Source: ClinicalTrials.gov public record
Updated Mar 28, 2019 · Synced Oct 16, 2026, 10:16 PM EDT
Terminated Phase 3 Interventional Results available

Extension Study of Pimavanserin in Subjects With Major Depressive Disorder and Inadequate Response to Antidepressant Treatment

NCT04000009
View directory record Official record
Conditions
Adjunctive Treatment of Major Depressive Disorder
Interventions
Pimavanserin
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
18 Years and older
Enrollment
235 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
33
States / cities
Garden Grove, California • Glendale, California • Irvine, California + 26 more
Source: ClinicalTrials.gov public record
Updated Apr 5, 2022 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 2 Interventional

Antipsychotic and Motor Effects of ACP-103 When Administered in Combination With Haloperidol and Risperidone

NCT00361166
View directory record Official record
Conditions
Schizophrenia
Interventions
ACP-103
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
11
States / cities
Cerritos, California • Garden Grove, California • Glendale, California + 7 more
Source: ClinicalTrials.gov public record
Updated Mar 22, 2007 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 3 Interventional Results available

Efficacy and Safety of Adjunctive Pimavanserin for the Treatment of Schizophrenia (ENHANCE-1)

NCT02970292
View directory record Official record
Conditions
Schizophrenia
Interventions
Pimavanserin, Placebo
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
396 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
33
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Rogers, Arkansas + 27 more
Source: ClinicalTrials.gov public record
Updated Jun 17, 2020 · Synced Oct 16, 2026, 10:16 PM EDT
Terminated No phase listed Observational

The INSYTE (Management of Parkinson's Disease Psychosis in Actual Practice) Study

NCT03152292
View directory record Official record
Conditions
Parkinson Disease Psychosis
Interventions
Real-world, non-interventional
Other
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
18 Years and older
Enrollment
764 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
69
States / cities
Cullman, Alabama • Anchorage, Alaska • Scottsdale, Arizona + 62 more
Source: ClinicalTrials.gov public record
Updated Aug 6, 2021 · Synced Oct 16, 2026, 10:16 PM EDT
Recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Psilocybin Efficacy With or Without Pimavanserin Pretreatment

NCT07610135
View directory record Official record
Conditions
Mood (Psychological Function), Well Being, Mood, Healthy
Interventions
Psilocybin, Pimavanserin, Inactive Placebo
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
21 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 1, 2026 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 3 Interventional Results available

Relapse Prevention Study of Pimavanserin in Dementia-related Psychosis

NCT03325556
View directory record Official record
Conditions
Dementia-related Psychosis
Interventions
Placebo, Pimavanserin 34 mg, Pimavanserin 20 mg
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
50 Years to 90 Years
Enrollment
392 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
27
States / cities
Costa Mesa, California • Fullerton, California • Aventura, Florida + 22 more
Source: ClinicalTrials.gov public record
Updated Jun 21, 2021 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 2 Interventional Results available

A Study of Pimavanserin for the Treatment of Agitation and Aggression in Subjects With Alzheimer's Disease

NCT03118947
View directory record Official record
Conditions
Agitation and Aggression in Alzheimer's Disease
Interventions
Pimavanserin
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
50 Years and older
Enrollment
79 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
17
States / cities
Costa Mesa, California • Fresno, California • Fullerton, California + 14 more
Source: ClinicalTrials.gov public record
Updated Apr 9, 2020 · Synced Oct 16, 2026, 10:16 PM EDT
Terminated Phase 3 Interventional Results available

Extension Study of Pimavanserin for the Adjunctive Treatment of Schizophrenia

NCT03121586
View directory record Official record
Conditions
Schizophrenia
Interventions
Pimavanserin
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
18 Years and older
Enrollment
995 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2024
U.S. locations
32
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Rogers, Arkansas + 27 more
Source: ClinicalTrials.gov public record
Updated Aug 24, 2025 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 3 Interventional Results available

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

NCT00477672
View directory record Official record
Conditions
Parkinson's Disease Psychosis
Interventions
Pimavanserin tartrate (ACP-103), Placebo
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
40 Years and older
Enrollment
298 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
36
States / cities
Gilbert, Arizona • Phoenix, Arizona • Berkeley, California + 33 more
Source: ClinicalTrials.gov public record
Updated May 17, 2017 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 2 Interventional Results available

Safety and Efficacy of Pimavanserin in Adults With Parkinson's Disease and Depression

NCT03482882
View directory record Official record
Conditions
Treatment of Depression in Adults With Parkinson's Disease (PD)
Interventions
Pimavanserin
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
50 Years and older
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
21
States / cities
Costa Mesa, California • Fountain Valley, California • Pasadena, California + 18 more
Source: ClinicalTrials.gov public record
Updated Aug 31, 2020 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 2 Interventional Results available

Efficacy and Safety of Pimavanserin as Adjunctive Treatment for the Negative Symptoms of Schizophrenia (ADVANCE)

NCT02970305
View directory record Official record
Conditions
Schizophrenia
Interventions
Pimavanserin, Placebo
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
403 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
33
States / cities
Phoenix, Arizona • Rogers, Arkansas • Bellflower, California + 27 more
Source: ClinicalTrials.gov public record
Updated Dec 22, 2020 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 3 Interventional Results available

Adjunctive Pimavanserin in Subjects With Major Depressive Disorder and Inadequate Response to Antidepressant Treatment

NCT03968159
View directory record Official record
Conditions
Adjunctive Treatment of Major Depressive Disorder
Interventions
Pimavanserin, Placebo
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
18 Years and older
Enrollment
298 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
41
States / cities
Birmingham, Alabama • Garden Grove, California • Glendale, California + 34 more
Source: ClinicalTrials.gov public record
Updated Nov 17, 2021 · Synced Oct 16, 2026, 10:16 PM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

Pimavanserin and Aggression and Social Cognition.

NCT05895513
View directory record Official record
Conditions
Intermittent Explosive Disorder
Interventions
Pimavanserin 34 mg, Placebo
Drug
Lead sponsor
Ohio State University
Other
Eligibility
21 Years to 55 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2028
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 27, 2025 · Synced Oct 16, 2026, 10:16 PM EDT
Recruiting Phase 2 Interventional

Pimavanserin for Insomnia in Veterans With PTSD

NCT05441280
View directory record Official record
Conditions
Post-traumatic Stress Disorder, Insomnia
Interventions
pimavanserin, Placebo
Drug · Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years to 64 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 4, 2026 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 3 Interventional Results available

A Study of the Safety and Efficacy of Pimavanserin in Patients With Parkinson's Disease Psychosis

NCT01174004
View directory record Official record
Conditions
Parkinson's Disease Psychosis
Interventions
pimavanserin tartrate, placebo
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
40 Years and older
Enrollment
199 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
62
States / cities
Gilbert, Arizona • Phoenix, Arizona • Tucson, Arizona + 58 more
Source: ClinicalTrials.gov public record
Updated Mar 26, 2014 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 2 Interventional Results available

Study to Evaluate the Efficacy and Safety of Adjunctive Pimavanserin in Major Depressive Disorder (CLARITY)

NCT03018340
View directory record Official record
Conditions
Adjunctive Treatment of Major Depressive Disorder
Interventions
Pimavanserin, Placebo
Drug · Other
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
18 Years and older
Enrollment
207 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
36
States / cities
Birmingham, Alabama • Rogers, Arkansas • Garden Grove, California + 31 more
Source: ClinicalTrials.gov public record
Updated Nov 14, 2019 · Synced Oct 16, 2026, 10:16 PM EDT
Recruiting Phase 2 Interventional

Pimavanserin for Rigid-compulsive Symptoms in Autism Spectrum Disorder

NCT05999240
View directory record Official record
Conditions
Autism Spectrum Disorder
Interventions
Pimavanserin Tartrate 34 Mg ORAL CAPSULE [NUPLAZID], Placebo
Drug
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
12 Years to 40 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
2
States / cities
Lawrence, Kansas • White Plains, New York
Source: ClinicalTrials.gov public record
Updated Sep 2, 2026 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Early Phase 1 Interventional

Pimavanserin Treatment in TS

NCT04794413
View directory record Official record
Conditions
Tourette Syndrome, Tardive Dyskinesia
Interventions
Pimavanserin
Drug
Lead sponsor
Joseph Jankovic
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 12, 2021 · Synced Oct 16, 2026, 10:16 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Pimavanserin vs. Quetiapine for Treatment of Parkinson's Psychosis

NCT04373317
View directory record Official record
Conditions
Parkinson's Disease Psychosis
Interventions
Pimavanserin, Quetiapine
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
40 Years and older
Enrollment
358 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2028
U.S. locations
24
States / cities
Tucson, Arizona • Loma Linda, California • Palo Alto, California + 20 more
Source: ClinicalTrials.gov public record
Updated Aug 19, 2026 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 2 Interventional Results available

An Open-label Safety Study of Pimavanserin in Parkinson's Disease Patients

NCT01518309
View directory record Official record
Conditions
Parkinson's Disease Psychosis
Interventions
pimavanserin tartrate (ACP-103)
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
Not listed
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2013
U.S. locations
1
States / cities
Danbury, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 23, 2020 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 4 Interventional Results available

Pimavanserin for Insomnia In Veterans With Posttraumatic Stress Disorder

NCT04188392
View directory record Official record
Conditions
Post-traumatic Stress Disorder, Insomnia
Interventions
Pimavanserin
Drug
Lead sponsor
Baylor College of Medicine
Other
Eligibility
18 Years to 64 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 31, 2022 · Synced Oct 16, 2026, 10:16 PM EDT
Terminated Phase 2 Interventional Results available

Study to Evaluate Safety and Daytime Sedation in Subjects With Parkinson's Disease With Neuropsychiatric Symptoms Treated With Pimavanserin or Low-Dose Quetiapine

NCT04164758
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Pimavanserin, Placebo, Quetiapine
Drug · Other
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
50 Years to 85 Years
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
16
States / cities
Scottsdale, Arizona • Tucson, Arizona • Sacramento, California + 13 more
Source: ClinicalTrials.gov public record
Updated Oct 14, 2021 · Synced Oct 16, 2026, 10:16 PM EDT
Completed Phase 3 Interventional Results available

A Safety Study of Pimavanserin in Adult and Elderly Subjects Experiencing Neuropsychiatric Symptoms Related to Neurodegenerative Disease

NCT03575052
View directory record Official record
Conditions
Neuropsychiatric Symptoms Related to Neurodegenerative Disease
Interventions
Pimavanserin, Placebo
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
60 Years and older
Enrollment
784 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
21
States / cities
Gilbert, Arizona • Costa Mesa, California • Santa Ana, California + 13 more
Source: ClinicalTrials.gov public record
Updated Dec 31, 2024 · Synced Oct 16, 2026, 10:16 PM EDT