Independent directory Public ClinicalTrials.gov records United States
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ClinicalTrials.gov public records Last synced Oct 16, 2026, 8:09 PM EDT

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Showing 1–24 of 45 matching trials from the live ClinicalTrials.gov search.
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
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
Conditions
Rett Syndrome
Interventions
Trofinetide
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
5 Years to 21 Years · Female only
Enrollment
154 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
21
States / cities
Birmingham, Alabama • Phoenix, Arizona • La Jolla, California + 18 more
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
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
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
Conditions
Rett Syndrome
Interventions
Trofinetide
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
2 Years to 5 Years · Female only
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
7
States / cities
Birmingham, Alabama • Aurora, Colorado • Chicago, Illinois + 4 more
Conditions
Alzheimer's Disease Psychosis
Interventions
ACP-204
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
55 Years to 95 Years
Enrollment
752 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
21
States / cities
Costa Mesa, California • Fresno, California • Garden Grove, California + 8 more
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
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
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
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
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
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
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
Recruiting Phase 2 Interventional Accepts healthy volunteers

Pimavanserin and Aggression and Social Cognition.

NCT05895513
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
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
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
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
Conditions
Hyperphagia in Prader-Willi Syndrome
Interventions
Carbetocin
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
5 Years to 30 Years
Enrollment
168 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
19
States / cities
Birmingham, Alabama • Phoenix, Arizona • Orange, California + 16 more
Conditions
Lewy Body Dementia Psychosis
Interventions
ACP-204, Placebo
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
55 Years to 84 Years
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2028
U.S. locations
30
States / cities
Irvine, California • Aurora, Colorado • Washington D.C., District of Columbia + 23 more
Conditions
Rett Syndrome
Interventions
trofinetide
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
5 Years to 21 Years · Female only
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
21
States / cities
Birmingham, Alabama • Phoenix, Arizona • La Jolla, California + 18 more
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
Conditions
Hyperphagia in Prader-Willi Syndrome
Interventions
Carbetocin, Placebo
Drug
Lead sponsor
ACADIA Pharmaceuticals Inc.
Industry
Eligibility
5 Years to 30 Years
Enrollment
175 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
19
States / cities
Birmingham, Alabama • Phoenix, Arizona • Orange, California + 16 more