NCT05304767 · Karuna Therapeutics
An Extension Study to Assess Long-Term Safety and Tolerability of Adjunctive KarXT in Subjects With Inadequately Controlled Symptoms of Schizophrenia
What this study is about
This is a Phase 3, conducted at multiple hospitals, 52-week, outpatient, where both patients and doctors know the treatment given extension (OLE) study to evaluate the long-term safety and how well patients handle the treatment of adjunctive KarXT in subjects with schizophrenia with an inadequate response to their current antipsychotic treatment who previously completed the treatment period (Visit 8/Day 42 ± 3) of ARISE Study (KAR-012). The primary objective of the study is to assess the long-term safety and how well patients handle the treatment of adjunctive KarXT (a fixed dose combination of xanomeline and t
View original scientific description
This is a Phase 3, multicenter, 52-week, outpatient, open-label extension (OLE) study to evaluate the long-term safety and tolerability of adjunctive KarXT in subjects with schizophrenia with an inadequate response to their current antipsychotic treatment who previously completed the treatment period (Visit 8/Day 42 ± 3) of ARISE Study (KAR-012).
Interventions
DRUG
Xanomeline and Trospium Chloride Capsules
KarXT 50 mg/20 mg BID KarXT 75mg/20 mg BID KarXT 100mg/20 mg BID KarXT 125mg/30 mg BID
Primary outcome measures
Incidence of treatment-emergent adverse events (TEAEs)
Time frame: From initial dose to safety follow-up visit (54 weeks) or early termination
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Subject is aged ≥18 to \<66 years at the time of randomization of Study KAR-012 2. Subject has successfully completed the treatment period of Study KAR-012 3. Subject has been compliant with the procedures in Study KAR-012 (in the Investigator's judgement) 4. Subject has been compliant with their background antipsychotic drug in Study KAR-012 in the opinion of the Investigator and based on subject and informant reporting Note: Subjects are required to remain on the same appropriate approved APD as in Study KAR-012 and should stay on that same dose throughout the study. 5. Subject is capable of providing signed Informed Consent Form before any study assessments will be performed 6. Subject resides in a stable living situation, in the opinion of the Investigator 7. Subject has identified a reliable informant/caregiver willing and able to assist with study activities as needed throughout the subject's participation in the study. The informant can complete the study
Where
- Phoenix, Arizona
- Little Rock, Arkansas
- Anaheim, California
- Bellflower, California
- Cerritos, California
- Culver City, California
- Garden Grove, California
- La Habra, California
- Lafayette, California
- Lemon Grove, California
- Los Angeles, California
- Oceanside, California
And 50 more locations — see the full list below.
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Mar 11, 2026 · Source of record for eligibility and locations