Host Led Harm Reduction Approach Among Men Who Have Sex With Men Who Engaged in Chemsex in Bangkok, Thailand: A Pre-Implementation Study

Host Led Harm Reduction Approach Among Men Who Have Sex With Men Who Engaged in Chemsex in Bangkok, Thailand: A Pre-Implementation Study

This study evaluates the pre-implementation phase of a host-led harm reduction model for men who have sex with men (MSM) engaging in chemsex in Bangkok, Thailand, focusing on understanding harms, contexts, and needs to develop a tailored intervention.

HAMMOCK is a cross-sectional mixed-methods study designed to explore chemsex practices among MSM, including both hosts and guests, as well as key stakeholders such as CSOs, hospital staff, and police.

The study aims to:

• Explore substance-related, sexual health, mental health, and socio-legal harms
• Understand the context and dynamics of private chemsex parties
• Co-develop a novel host-led harm reduction model
• Identify barriers and facilitators to implementation The study includes both quantitative (self-administered questionnaires) and qualitative (in-depth interviews) components and follows a two-phase approach: exploration and preparation phases under the EPIS framework.

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)