Sponsor or institution
Clinical trials and research at ACADIA Pharmaceuticals Inc.
As of November 12, 2026, Find a Trial lists 4 clinical trials run by ACADIA Pharmaceuticals Inc. that are recruiting, at sites in 12 countries (most in United States (4), Bulgaria (3), Czechia (3)). By phase: Phase 2 (2), Phase 3 (1), Phase 2/3 (1). Every study is explained in plain English. Data from ClinicalTrials.gov and NIH RePORTER, updated November 12, 2026.
- 4Clinical trials
- 12Countries
Newest trials
| Study | Phase | Where | Status | Registered |
|---|---|---|---|---|
| ACP-211 alone for adults whose depression hasn't improved with antidepressants | Phase 2 | Birmingham, Alabama and 27 other locations | Recruiting | Dec 16, 2025 |
| ACP-204 extended treatment in Lewy Body Dementia psychosis | Phase 3 | Irvine, California and 35 other locations | Recruiting | Jul 31, 2025 |
| ACP-204 for psychosis in Lewy body dementia (Phase 2) | Phase 2 | Irvine, California and 61 other locations | Recruiting | Jun 19, 2025 |
| Testing ACP-204 for treating psychosis in Alzheimer's patients | Phase 2/3 | Chandler, Arizona and 154 other locations | Recruiting | Dec 7, 2023 |
All recruiting trials (4)
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ACP-211 alone for adults whose depression hasn't improved with antidepressants
This trial tests whether ACP-211 can help adults with major depressive disorder who haven't improved on antidepressants do better than a placebo.
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ACP-204 extended treatment in Lewy Body Dementia psychosis
This study tests ACP-204 as a long-term treatment option for adults with Lewy Body Dementia psychosis who have completed prior ACP-204 treatment.
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ACP-204 for psychosis in Lewy body dementia (Phase 2)
This 6-week, randomized, double-blind trial tests whether ACP-204 reduces psychosis symptoms in people aged 55–84 with Lewy body dementia.
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Testing ACP-204 for treating psychosis in Alzheimer's patients
This study is testing a new medication called ACP-204 to see if it can help reduce psychotic symptoms in people with Alzheimer's disease.
Quick answers
How many clinical trials run by ACADIA Pharmaceuticals Inc. are recruiting right now?
4, as of November 12, 2026. We update this list each time we refresh our data from ClinicalTrials.gov.
Where are these trials running?
In 12 countries. The most sites are in United States (4 trials), Bulgaria (3 trials), Czechia (3 trials), France (3 trials), Italy (3 trials). Each study page lists its sites and which ones are recruiting.
What phases are they in?
Phase 2: 2, Phase 3: 1, Phase 2/3: 1. Trials with no phase listed are usually device, behavioural or observational studies.
How do I join one?
Open a study, check the "Is this trial a fit for you?" section, then contact the study team listed on the page. They will ask a few screening questions. Asking is free and does not commit you to anything. Talk it over with your doctor first.
Find the studies that fit you
A list is a starting point. Tell us your situation in your own words and we'll rank the studies that match and explain why. It's free and needs no account.