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ACP-211

Phase 2

Major Depressive Disorder (MDD) | Small molecule | Psychiatry |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 Trials1
Total Enrollment153
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07284667ACP-211 Monotherapy for Major Depressive Disorder With Inadequate Antidepressant ResponsePHASE2 RECRUITING 153Nov 14, 2025Sep 1, 2027Jun 8, 202621 United States
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Study Endpoints
Primary Endpoints
Change from Baseline in the Montgomery-Åsberg Depression Rating Scale (MADRS) total score at Day 28
Baseline and Day 28

The MADRS is a clinician-rated tool that assesses the severity of depressive symptoms. It consists of 10 items, each scored from 0 (no symptoms) to 6 (severe symptoms), resulting in a total score range of 0 to 60. Higher scores indicate greater depression severity.

Secondary Endpoints
Change from Baseline in the MADRS total score postdose at 24 hours (Day 2)
Baseline and Day 2
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
ACP-211 600 mgEXPERIMENTALACP-211 600 mg, administered orally twice weekly
ACP-211 300 mgEXPERIMENTALACP-211 300 mg, administered orally twice weekly
PlaceboPLACEBO_COMPARATORMatching placebo, administered orally twice weekly
Interventions
NameTypeDescription
ACP-211DRUGACP-211 monotherapy
PlaceboDRUGPlacebo control
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Eligibility Criteria
Age Range18 Years — 65 Years
SexALL
Healthy VolunteersNo
Study Sites21

Inclusion Criteria: * Adults ≥18 and ≤65 years of age * Provides written informed consent * Clinical diagnosis of MDD * History of inadequate response to at least two antidepressants, with at least one inadequate response documented during the current episode * Currently treated with an approved an...

Countries:United States
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Recent Changes (Last 90 Days)
LOWJun 8, 2026NCT07284667lastUpdatePostDate: changed
LOWJun 8, 2026NCT07284667lastUpdatePostDate: changed
LOWJun 8, 2026NCT07284667lastUpdatePostDate: changed
LOWMay 26, 2026NCT07284667primaryCompletionDate: changed
LOWMay 24, 2026NCT07284667studyFirstPostDate: changed