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ACP-204

Phase 3

Alzheimer's Disease Psychosis | Small molecule | Neurology |ACADIA Pharmaceuticals Inc.|Last Updated: Jun 8, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment1,826
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06194799ACP-204 in Adults With Alzheimer's Disease Psychosis Open Label Extension StudyPHASE3 ENROLLING BY_INVITATION 752Apr 23, 2024May 1, 2029Jun 2, 202671 United States, Brazil +10
NCT06159673ACP-204 in Adults With Alzheimer's Disease PsychosisPHASE2 RECRUITING 1,074Nov 14, 2023Feb 1, 2028Jun 8, 2026145 United States, Brazil +10
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Study Endpoints
Primary Endpoints
Treatment-emergent adverse events
52 Weeks

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.

Scale for the Assessment of Positive Symptoms-Hallucinations and Delusions subscales (SAPS-H+D) total score change from baseline (Substudies 1, 2A, 2B)
From baseline to Week 6

The SAPS-H+D subscales are a measure of two psychotic symptoms: hallucinations and delusions. The SAPS-H+D total score is the sum of the scores of the Hallucinations and Delusions subscales. The hallucinations domain score (SAPS-H) is the sum of the 7 hallucinations item scores, and the delusions domain core (SAPS-D) is the sum of the 13 delusions item scores.

Secondary Endpoints
Clinical Global Impression-Improvement in the ADP context (CGI-I-ADP) score
52 Weeks
Clinical Global Impression-Severity in the ADP context (CGI-S-ADP) score
Week 6
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
ACP-204EXPERIMENTALACP-204 30mg or 60mg
ACP-204 30 mgEXPERIMENTALAdministration once daily at approximately the same time of day, with or without food
ACP-204 60 mgEXPERIMENTALAdministration once daily at approximately the same time of day, with or without food
PlaceboPLACEBO_COMPARATORAdministration once daily at approximately the same time of day, with or without food
Interventions
NameTypeDescription
ACP-204DRUGACP-204 30 mg given once daily, as capsule OR ACP-204 60 mg given once daily, as capsule
PlaceboDRUGACP-204 matching placebo
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Eligibility Criteria
Age Range55 Years — 95 Years
SexALL
Healthy VolunteersNo
Study Sites71

Inclusion Criteria: * Subject has successfully completed ACP-204-006 study * Male or female (age 55 to 95 years old): female must be of non-childbearing potential, male must take appropriate contraceptive method if partner has childbearing potential * Subject has a designated study partner/caregive...

Countries:United StatesBrazilBulgariaChileCzechiaFranceItalyMexicoSerbiaSouth KoreaSpainTaiwan
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Recent Changes (Last 90 Days)
LOWJun 8, 2026NCT06159673lastUpdatePostDate: changed
LOWJun 8, 2026NCT06159673lastUpdatePostDate: changed
LOWJun 8, 2026NCT06159673lastUpdatePostDate: changed
LOWJun 2, 2026NCT06194799lastUpdatePostDate: changed
LOWJun 2, 2026NCT06194799lastUpdatePostDate: changed
LOWJun 2, 2026NCT06194799lastUpdatePostDate: changed
LOWMay 28, 2026NCT06159673lastUpdatePostDate: changed
LOWMay 28, 2026NCT06159673lastUpdatePostDate: changed
LOWMay 26, 2026NCT06159673primaryCompletionDate: changed
LOWMay 26, 2026NCT06194799primaryCompletionDate: changed
LOWMay 24, 2026NCT06159673studyFirstPostDate: changed
LOWMay 24, 2026NCT06194799studyFirstPostDate: changed