Host-led harm reduction for men who have sex with men who engage in chemsex in Bangkok
Official title: Host Led Harm Reduction Approach Among Men Who Have Sex With Men Who Engaged in Chemsex in Bangkok, Thailand: A Pre-Implementation Study
Run by Institute of HIV Research and Innovation Foundation, Thailand · NCT07512869 · Data updated 2026-11-12
This project will try a host-led harm reduction approach to reduce substance-related, sexual, mental health, and legal harms among men who have sex with men who engage in chemsex in Bangkok.
Quick facts
| Study type | Observational |
|---|---|
| Ages | 18 Years and up |
| Sex | Men only |
| Enrollment | 76 (estimated) |
| Sponsor | Institute of HIV Research and Innovation Foundation, Thailand Academic / other |
| Locations | 1 site (Pathum Wan, Bangkok) |
| Status | Recruiting |
| Started | February 17, 2025 |
| Main results expected | February 17, 2027 |
| Study ends | December 30, 2028 |
| Registry record updated | April 6, 2026 |
| Trial ID | NCT07512869 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal participants are Thai-speaking men who have sex with men aged 18 or older who have hosted or attended at least two chemsex events in the past six months, or community organization, hospital, or police staff with at least three months' relevant experience.
✕Probably not a fit
People who are not MSM, under 18, unable to consent or communicate in Thai, not involved in chemsex, located outside Bangkok, or currently needing urgent medical or addiction treatment are unlikely to benefit from this pre-implementation work.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
HAMMOCK is a cross-sectional mixed-methods pre-implementation study using the EPIS framework to explore chemsex practices among MSM hosts and guests in Bangkok. The study combines self-administered questionnaires and in-depth interviews with hosts, guests, and stakeholders including community organizations, clinic staff, and police to map harms, contexts, and needs. Investigators will co-develop and refine a host-led harm reduction model and identify barriers and facilitators to implementation. Results will inform preparation for pilot implementation of tailored harm reduction strategies in private chemsex settings.
Why it matters
Potential benefit: If successful, the model could offer practical, host-delivered strategies that lower overdose risk, improve sexual and mental health outcomes, and reduce socio-legal harms for MSM involved in chemsex.
How similar studies have gone: Community-led harm reduction programs have shown benefits in related substance-use and sexual-health contexts, but a host-led model specifically targeting chemsex is largely novel and has limited prior testing.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * MSM aged ≥18 years * Able to communicate in Thai * Specific by group: * Chemsex hosts: hosted ≥2 times in past 6 months * Chemsex guests: attended ≥2 times in past 6 months * CSO / hospital / police staff: working ≥3 months in related roles * Provide informed consent Exclusion Criteria: • Unable to provide informed consent (e.g., under substance influence at consent)
Where it's running
-
Tangerine Clinic, Institute of HIV Research and Innovation
Pathum Wan, Bangkok, Thailand Recruiting
Study contacts
- Principal investigator: Jakkrapatara Boonruang, MD — Institute of HIV Research and Innovation (IHRI)
- Study coordinator: Nittaya Phanuphak, MD,PhD.
- Email: nittaya.p@ihri.org
- Phone: 6681 825 3544
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.