A Chatbot to Reduce Chemsex and HIV-related Risk Behaviors Among Men Who Have Sex With Men
1 other identifier
interventional
100
0 countries
N/A
Brief Summary
The goal of this clinical trial is to investigate whether receiving chatbot-delivered stage-of-change-tailored online interventions is effective in reducing chemsex among men who have sex with men in Hong Kong. The main question it aims to answer is: Does chatbot-delivered stage-of-changed online interventions reduce chemsex among men who have sex with men Eligible participants will be randomly assigned to either the intervention or the control group. The control group will watch one online video introducing chemsex-related knowledge and harm reduction skills per week for 12 weeks. On top of the interventions received by the control group, participants in the intervention group will have access to a chatbot during the 12-week intervention period. The chatbot will deliver 12 weekly episodes of interventions tailored to once's current stage-of-change related to chemsex. The chatbot will also address questions related to chemsex during the intervention period.
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at P50-P75 for not_applicable
Started Apr 2026
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
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Study Timeline
Key milestones and dates
First Submitted
Initial submission to the registry
February 11, 2026
CompletedFirst Posted
Study publicly available on registry
March 16, 2026
CompletedStudy Start
First participant enrolled
April 1, 2026
CompletedPrimary Completion
Last participant's last visit for primary outcome
March 31, 2027
ExpectedStudy Completion
Last participant's last visit for all outcomes
March 31, 2027
March 16, 2026
March 1, 2026
12 months
February 11, 2026
March 13, 2026
Conditions
Outcome Measures
Primary Outcomes (1)
Presence of chemsex in the past 3 months
Presence of chemsex will be measured by a validated questionnaire. Chemsex is defined as the use of any of the following psychoactive substances before or during sexual intercourse: ketamine, methamphetamine, cocaine, cannabis, ecstasy, Dormicum/Halcion/Erimin 5/nonprescription hypnotic drugs, heroin, cough suppressant (not for curing cough), amyl nitrite (popper), GHB/GBL, 5-methoxy-N, N-diisopropyltryptamine (Foxy), and mephedrone. Participants will be asked whether they had used any of the aforementioned psychoactive substances before or during sexual intercourse in the past 3 months at baseline, after completion of the 12-week intervention (Month 3 or Week 12), and 3 months after completion of the 12-week intervention (Month 6)
Baseline, after completion of the 12-week intervention (Month 3 or Week 12), and 3 months after completion of the 12-week intervention (Month 6)
Study Arms (2)
Intervention group
EXPERIMENTALChatbot-delivered interventions and online videos
Control group
ACTIVE COMPARATOROnline videos only
Interventions
Participants will watch one online video introducing chemsex-related knowledge and harm reduction skills per week for 12 weeks. The chatbot will deliver 12 weekly episodes of interventions tailored to once's current stage-of-change related to chemsex. The chatbot will also address questions related to chemsex during the intervention period.
Participants will watch one online video introducing chemsex-related knowledge and harm reduction skills per week for 12 weeks.
Eligibility Criteria
You may qualify if:
- Hong Kong men aged at least 18 years
- Able to understand Cantonese
- Had anal intercourse with at least one man within the past six months
- Willingness to provide contact information for follow-up
- Having access to WhatsApp
You may not qualify if:
- Self-reported a diagnosis of schizophrenia or bipolar disorder
Contact the study team to confirm eligibility.
Sponsors & Collaborators
MeSH Terms
Conditions
Central Study Contacts
Study Design
- Study Type
- interventional
- Phase
- not applicable
- Allocation
- RANDOMIZED
- Masking
- SINGLE
- Who Masked
- OUTCOMES ASSESSOR
- Purpose
- PREVENTION
- Intervention Model
- PARALLEL
- Sponsor Type
- OTHER
- Responsible Party
- PRINCIPAL INVESTIGATOR
- PI Title
- Assistant Professor
Study Record Dates
First Submitted
February 11, 2026
First Posted
March 16, 2026
Study Start
April 1, 2026
Primary Completion (Estimated)
March 31, 2027
Study Completion (Estimated)
March 31, 2027
Last Updated
March 16, 2026
Record last verified: 2026-03
Data Sharing
- IPD Sharing
- Will not share
The data contains sensitive behaviors.