A Phase 3 interventional study of ACP-204 in Alzheimer's Disease Psychosis, sponsored by ACADIA Pharmaceuticals Inc.. Enrolling by invitation at 78 sites in 12 countries. Open to participants aged 55 Years to 95 Years. Per ClinicalTrials.gov, last updated 2026-11-04.
Sponsored by ACADIA Pharmaceuticals Inc. · Phase 3, Interventional, and Treatment
This 52-week, open-label extension study is to evaluate the long-term safety and tolerability of ACP-204 in subjects with ADP.
136 studies on the registry are indexed under Hallucinations; 35 are open to participants now.
This study's planned enrollment of 752 is above the median of 48 across 118 interventional studies indexed under Hallucinations.
Browse Hallucinations studies →ACADIA Pharmaceuticals Inc. is the lead sponsor of 41 studies on the registry; 5 are open to participants now.
Of its 26 completed or terminated interventional studies of FDA-regulated products, 24 (92%) have results posted.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Additional inclusion/exclusion criteria apply. Subjects will be evaluated at screening to ensure that all criteria for study participation are met.
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ACP-204 30mg or 60mg
Drug: ACP-204
ACP-204 30 mg given once daily, as capsule OR ACP-204 60 mg given once daily, as capsule
Treatment-emergent adverse events
Number of Subjects With Adverse Events (AEs), Discontinuations Due to AEs and Serious AEs (SAEs) over 52 weeks of treatment. The Safety population consists of all subjects who received at least one dose of study drug in this study.
Time frame: 52 Weeks
Clinical Global Impression-Improvement in the ADP context (CGI-I-ADP) score
Time frame: 52 Weeks
Plan to share: No
No publications or documents are linked to this record.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
No contact was published for this record. The registry link below has the sponsor’s details.
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Studies of the drug tested here: Remlifanserin