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BXCL501

Phase 3

Agitation,Psychomotor | Small molecule | Psychiatry |BioXcel Therapeutics, Inc.|Last Updated: Apr 14, 2026

Success Probability
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment452
FDA Designations
BREAKTHROUGH_THERAPYFAST_TRACK
Clinical trial landscape

BXCL501 · 3 trials · 10 indications

Phase 3 2Phase 1 1
NCT05658510Dexmedetomidine in the Treatment of Agitation Associated With Schizophrenia and Bipolar Disorder (SERENITY III)Agitation,Psychomotor
COMPLETED452 Analytics
NCT05271552Dexmedetomidine in the Treatment of Agitation Associated With Dementia (TRANQUILITY II)Agitation
COMPLETED151 Analytics
PHASE3COMPLETED
Dexmedetomidine in the Treatment of Agitation Associated With Schizophrenia and Bipolar Disorder (SERENITY III)
Agitation,PsychomotorUnlock trial analytics
PHASE3COMPLETED
Dexmedetomidine in the Treatment of Agitation Associated With Dementia (TRANQUILITY II)
AgitationUnlock trial analytics
Study Endpoints
Primary Endpoints
Part 1: Change from baseline in Positive and Negative Syndrome Scale - Excited (PEC) total score
2 hours

The Positive and Negative Syndrome Scale - Excited Component (PEC) comprises 5 items associated with agitation: poor impulse control, tension, hostility, uncooperativeness, and excitement; each scored 1 (minimum) to 7 (maximum). The PEC, the sum of these 5 subscales, thus ranges from 5 (absence of agitation) to 35 (extremely severe)

Part 2: The incidence of SAEs and TEAEs compared with placebo.
Through study completion, an average of 12 weeks

To assess the safety of 120 mcg BXCL501 when used in an at-home environment based on serious adverse events (SAE) and treatment emergent adverse events (TEAEs).

Absolute Change From Baseline in Positive and Negative Syndrome Scale- Excited Component (PEC) Total Score for the First Episode of Agitation
120 minutes

The Positive and Negative Syndrome Scale - Excited Component (PEC) comprises 5 items associated with agitation: poor impulse control, tension, hostility, uncooperativeness, and excitement; each scored 1 (minimum) to 7 (maximum). The PEC, the sum of these 5 subscales, thus ranges from 5 (absence of agitation) to 35 (extremely severe)

Safety of BXCL501 versus Placebo and Lofexidine
Study Days 1-7

Establish the safety of BXCL501 relative to placebo and lofexidine in subjects with OUD who are physically dependent on opioids as measured by the frequency of adverse events.

Secondary Endpoints
Part 1: Clinical Global Impression - Improvement (CGI-I)
2 hours
Part 1: Change in Modified Clinical Global Impression - Severity (mCGI-S) scores from Baseline
2 hours
Part 1:The number of responders based on the Modified Clinical Global Impression - Severity (mCGI-S) score
2 hours
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part 1: 60 mcg of BXCL501EXPERIMENTALSublingual film containing 60 Micrograms Dexmedetomidine
Part 1: Matching PlaceboPLACEBO_COMPARATORSublingual Placebo film
Part 2: 120 mcg of BXCL501EXPERIMENTALSublingual film containing 120 Micrograms Dexmedetomidine
Part 2: Matching PlaceboPLACEBO_COMPARATORSublingual Placebo film
Cohort 1- 40 MicrogramsEXPERIMENTALSublingual film containing 40 Micrograms Dexmedetomidine
Cohort 2- 60 MicrogramsEXPERIMENTALSublingual film containing 60 Micrograms Dexmedetomidine
PlaceboPLACEBO_COMPARATORSublingual Placebo film
BXCL501 (180 micrograms)EXPERIMENTALThe current study is a randomized, double-blind, double-dummy inpatient study comparing BXCL501 (180 and 240 ug BID), lofexidine (as a positive control), and placebo.
BXCL501 (240 micrograms)EXPERIMENTALThe current study is a randomized, double-blind, double-dummy inpatient study comparing BXCL501 (180 and 240 ug BID), lofexidine (as a positive control), and placebo.
Lofexidine (Positive Control)ACTIVE_COMPARATORThe current study is a randomized, double-blind, double-dummy inpatient study comparing BXCL501 (180 and 240 ug BID), lofexidine (as a positive control), and placebo.
Interventions
NameTypeDescription
BXCL501DRUGSublingual Film
Matching PlaceboDRUGSublingual Placebo Film
BXCL501 (180 micrograms)DRUGThroughout the 7-day inpatient study (Figure 1; Table 1), participants will receive sublingual BXCL501 or placebo twice daily and lofexidine or placebo 4 times daily using a double-blind, double-dummy design.
BXCL501 (240 micrograms)DRUGThroughout the 7-day inpatient study (Figure 1; Table 1), participants will receive sublingual BXCL501 or placebo twice daily and lofexidine or placebo 4 times daily using a double-blind, double-dummy design.
PlaceboOTHERThroughout the 7-day inpatient study (Figure 1; Table 1), participants will receive sublingual BXCL501 or placebo twice daily and lofexidine or placebo 4 times daily using a double-blind, double-dummy design.
Lofexidine (Positive Control)OTHERThroughout the 7-day inpatient study (Figure 1; Table 1), participants will receive sublingual BXCL501 or placebo twice daily and lofexidine or placebo 4 times daily using a double-blind, double-dummy design.
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Eligibility Criteria
Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites24

A patient may enroll in only one part of the study; either Part 1 or Part 2. Inclusion Criteria: * Male and female patients between the ages of 18 to 75 years, inclusive * Patients who can read, understand and provide written informed consent. * Patients who have met Diagnostic and Statistical Man...

Countries:United States
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT05712707primaryCompletionDate: changed
LOWMay 24, 2026NCT05712707studyFirstPostDate: changed