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Study details
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An Extension Study to Assess Long-Term Safety and Tolerability of Adjunctive KarXT in Subjects With Inadequately Controlled Symptoms of Schizophrenia

Karuna Therapeutics, Inc., a Bristol Myers Squibb company
NCT IDNCT05304767ClinicalTrials.gov data as of Apr 2026
Phase

Phase 3

Target enrollment

280

Study length

about 4 years

Ages

18–65

Locations

79 sites in AR, AZ, CA +20

What this study is about

Researchers are testing the safety and tolerability of a treatment called KarXT, which contains xanomeline and trospium chloride, for people with schizophrenia who haven't responded well to their current medication. The trial will last 1473 days and involve about 280 participants.

Simplified from trial records by PatientMatch.

What you may be asked to do

  • 1.Take Xanomeline and Trospium Chloride Capsules

Participation Burden

What's physically and logistically required of participants.

Logistics & Travel
In-person visits

Requires travel to a study site

Physical Intervention
Oral

How treatment is administered

Treatment Assignment
All receive treatment

Everyone gets the investigational treatment.

Extracted study details

Pulled from the trial record to show what is being tested and what the study is measuring.

Drug classes

trospium, Antipsychotic Agent [TC] (Cholinergic Muscarinic Agonists)

Drug routes

oral

Endpoints

Primary: Incidence of treatment-emergent adverse events (TEAEs)

Secondary: Incidence of TEAEs leading to discontinuation of study drug, Incidence of serious treatment-emergent adverse events (TEAEs)

Body systems

Psychiatry / Mental Health