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Study identifier: NCT06633900 Synced from ClinicalTrials.gov · July 28, 2026
● Recruiting

Naltrexone for Overdose Prevention

Condition: Overdose Accidental  ·  Sponsor: University of California, San Francisco

PhasePhase 2/Phase 3
Planned participants100
Who can joinAll sexes, 18 Years to no upper limit
Healthy volunteersYes

About this study

The goal of this clinical trial is to see if an injectable medicine called naltrexone can prevent fentanyl overdose deaths in people who use other drugs (cocaine, methamphetamine). The main questions it aims to answer are: What are the challenges for implementing naltrexone as an overdose prevention strategy? Are injections of naltrexone effective for opioid overdose prevention among people who use stimulants? How often are people who use stimulants and do not intentionally use opioids unintentionally exposed to opioids? Researchers will compare participants to receive the study medication to the usual care group to see if one group experiences fewer opioid overdose events than the other. Participants will be randomized to either receive a monthly injection of naltrexone over six months, or receive usual care. Usual care includes harm reduction supplies. Laboratory procedures will include the collection of urine, blood, and hair samples for various safety and outcome measure testing.

This description comes directly from the study's public registry record.

Talk to the study team

Ayesha Appa, MD  ·  628-206-7839  ·  ayesha.appa@ucsf.edu

Xochitl Luna Marti, MPH  ·  628-217-6235  ·  xochitl.lunamarti@sfdph.org

Always discuss trial participation with your own doctor first.

Locations (1)

Center on Substance Use and HealthSan Francisco, California, United StatesRecruiting

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Source record: clinicaltrials.gov/study/NCT06633900