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

Completed · Phase 3

Conditions studied: Schizophrenia

In brief

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). The primary objective of the study is to assess the long-term safety and tolerability of adjunctive KarXT (a fixed dose combination of xanomeline and trospium chloride twice daily \[BID\]) in subjects with schizophrenia.

Key facts

Study ID

NCT05304767

Run by

Karuna Therapeutics, Inc., a Bristol Myers Squibb company

People needed

290

Starts

2022-03-07

Expected to finish

2026-03-25

Last updated by the study team

2026-07-31

Who can join

Age: 18 and older, up to 65. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Subject is aged ≥18 to <66 years at the time of randomization of Study KAR-012
• Subject has successfully completed the treatment period of Study KAR-012
• Subject has been compliant with the procedures in Study KAR-012 (in the Investigator's judgement)
• 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.
• Subject is capable of providing signed Informed Consent Form before any study assessments will be performed
• Subject resides in a stable living situation, in the opinion of the Investigator
• 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.
• 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).

You may not qualify if…

• 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:
• 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
• Non-suicidal self-injurious behavior is not exclusionary
• 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
• Female subject is pregnant
• 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
• Risk of violent or destructive behavior as per Investigator's judgement
• Subjects participating in another investigational drug or device trial or planning on participating in another clinical trial during the study
• History or high risk of urinary retention, gastric retention, or narrow angle glaucoma as evaluated by the Investigator
• Subject is taking, or plans to take while in the study, any prohibited concomitant medication
• For all male subjects only, any one of the following:
• History of bladder stones
• History of recurrent urinary tract infections
• Serum prostate specific antigen (PSA) >10 ng/mL
• An International Prostate Symptom Score (IPSS) of 5 (almost always) on either item 1, 3, 5, or 6
• 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 it is running

• Local Institution - 175 — Little Rock, Arkansas, United States
• Local Institution - 112 — Little Rock, Arkansas, United States
• Local Institution - 146 — Anaheim, California, United States
• Local Institution - 130 — Bellflower, California, United States
• Local Institution - 110 — Cerritos, California, United States
• Local Institution - 167 — Culver City, California, United States
• Local Institution - 127 — Garden Grove, California, United States
• Local Institution - 152 — La Habra, California, United States
• Local Institution - 126 — Lafayette, California, United States
• Local Institution - 131 — Lemon Grove, California, United States
• Local Institution - 181 — Oceanside, California, United States
• Local Institution - 150 — Orange, California, United States
• Local Institution - 170 — Pico Rivera, California, United States
• Local Institution - 144 — Riverside, California, United States
• Local Institution - 164 — Stanford, California, United States
• Local Institution - 109 — Torrance, California, United States
• Local Institution - 186 — Coral Gables, Florida, United States
• Local Institution - 182 — Hialeah, Florida, United States
• Local Institution - 133 — Hialeah, Florida, United States
• Local Institution - 105 — Lauderhill, Florida, United States
• Local Institution - 145 — Miami, Florida, United States
• Local Institution - 171 — Miami, Florida, United States
• Local Institution - 173 — Miami Lakes, Florida, United States
• Local Institution - 153 — Miami Lakes, Florida, United States
• Local Institution - 161 — Phoenix, Arizona, United States

Full record on ClinicalTrials.gov

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