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Long-term safety assessment of KarXT for schizophrenia symptoms

An Open-label Extension Study to Assess the Long-term Safety and Tolerability of Adjunctive KarXT in Subjects With Inadequately Controlled Symptoms of Schizophrenia

Phase 3 Interventional Karuna Therapeutics, Inc., a Bristol Myers Squibb company · NCT05304767

This study is testing if a new combination treatment can be safely used for a year in people with schizophrenia who haven't felt better with their current medications.

Quick facts

PhasePhase 3
Study typeInterventional
Enrollment280 (estimated)
Ages18 Years to 65 Years
SexAll
SponsorKaruna Therapeutics, Inc., a Bristol Myers Squibb company Industry-sponsored
Locations175 sites (Phoenix, Arizona and 174 other locations)
Trial IDNCT05304767 on ClinicalTrials.gov

What this trial studies

This Phase 3, multicenter, open-label extension study evaluates the long-term safety and tolerability of adjunctive KarXT in individuals with schizophrenia who have not adequately responded to their current antipsychotic treatment. Participants must have previously completed the treatment period of the ARISE Study and will receive a fixed dose combination of xanomeline and trospium chloride twice daily for 52 weeks. The study aims to gather data on the ongoing safety and tolerability of this treatment in a real-world outpatient setting.

Who should consider this trial

Good fit: Ideal candidates are adults aged 18 to 65 who have completed the prior ARISE Study and are currently experiencing inadequate symptom control with their antipsychotic medication.

Not a fit: Patients who have not participated in the prior ARISE Study or those who are not compliant with their current antipsychotic treatment may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could provide a new adjunctive treatment option for patients with schizophrenia who struggle to manage their symptoms with existing therapies.

How similar studies have performed: Other studies have shown promise with similar adjunctive treatments for schizophrenia, indicating potential for success in this approach.

Eligibility criteria

Show full inclusion / exclusion criteria 
Inclusion Criteria:

1. 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 visits assessments via phone (as per local regulations). In Bulgaria, the informant needs to be physically present at all study visits where the Investigator determines that his/her input would be beneficial.
8. Women of childbearing potential (WOCP), or men whose sexual partners are WOCP, must be able and willing to use at least 1 highly effective method of contraception during the study and for at least 1 menstrual cycle (e.g., 30 days) after the last dose of study drug. Sperm donation is not allowed for 30 days after the final dose of the study drug. A female subject is considered to be a WOCP after menarche and until she is in a postmenopausal state for 12 months or otherwise permanently sterile (for which acceptable methods include hysterectomy, bilateral salpingectomy, or bilateral oophorectomy).

Exclusion Criteria:

1. Risk for suicidal behavior during the study as determined by the Investigator's clinical assessment and/or Columbia-Suicide Severity Rating Scale (C-SSRS) as confirmed by the following:

   1. Subject answers "Yes" to "suicidal ideation" Item 4 (active suicidal ideation with some intent to act, without a specific plan) or Item 5 (active suicidal ideation with a specific plan and intent) on the C-SSRS
   2. Non-suicidal self-injurious behavior is not exclusionary
2. Any clinically significant abnormalities, including any finding(s) from ECG, or laboratory test at Visit 6, and the physical examination, vital signs, at the EOT visit of Study KAR-012 that the Investigator, in consultation with the Medical Monitor are considered to jeopardize the safety of the subject
3. Female subject is pregnant
4. If, in the opinion of the Investigator (and/or Sponsor/ Medical Monitor), subject is unsuitable for enrollment in the study or subject has any finding that, in the view of the Investigator (and/or Sponsor /Medical Monitor), may compromise the safety of the subject or affect their ability to adhere to the protocol visit schedule or study requirements
5. Risk of violent or destructive behavior as per Investigator's judgement
6. Subjects participating in another investigational drug or device trial or planning on participating in another clinical trial during the study
7. History or high risk of urinary retention, gastric retention, or narrow angle glaucoma as evaluated by the Investigator
8. Subject is taking, or plans to take while in the study, any prohibited concomitant medication
9. For all male subjects only, any one of the following:

   1. History of bladder stones
   2. History of recurrent urinary tract infections
   3. Serum prostate specific antigen (PSA) \>10 ng/mL
   4. An International Prostate Symptom Score (IPSS) of 5 (almost always) on either item 1, 3, 5, or 6
   5. A sum of scores on IPSS items 1, 3, 5, and 6 of ≥9 Note: IPSS will be required only for male subjects ≥ 45 years of age. Subjects already enrolled in the study who do not have available PSA values from Study KAR-012 for baseline value use in Study CN012-0009, will have these assessments at their next clinic visit planned after re-consenting to determine current eligibility.

Where this trial is running

Phoenix, Arizona and 174 other locations

+125 more sites — see ClinicalTrials.gov for the full list.

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
View on ClinicalTrials.gov → Find more trials like this →
Conditions Schizophrenia
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.