Screen, Treat and Retain Meth-using People With Opioid Use Disorders at Methadone Clinics

The investigators propose to develop and evaluate optimal combinations of evidence-based interventions to improve HIV outcomes and reduce methamphetamine use (hereafter: meth use) among people with opioid use disorder who are in methadone maintenance therapy (MMT) in Vietnam. Over the past decade, the expansion of MMT has contributed to stemming both HIV and opioid epidemics. However, rising meth use threatens these achievements. Evidence-based interventions such as Motivational Enhancement Therapy, Contingency Management, Matrix Model, and SMS reminders are effective in reducing meth use. The study will be conducted in the two largest cities in Vietnam, Hanoi and Ho Chi Minh City (HCMC), where there are the highest number of MMT patients and the highest burden of HIV cases. Building on the pilot work of the research team in Hanoi, through collaborative work with local MMT providers and patients, the investigators will first further refine adapted EBIs to develop adaptive strategies. The adaptive design includes: (1) Two frontline interventions: 6 weeks of contingency management then 6 weeks of weekly group educational sessions and 12 weeks of contingency management; (2) One (short-term) tailoring outcome: urine tests negative with meth metabolites in both week 11 and 12 are considered responsive to frontline interventions; (3) Three alternative interventions: those with positive outcomes will move to 12-week maintenance stage and receive two daily SMS reminders plus one weekly self-monitoring assessment messages. Non-responders will move to 12-week enhanced treatment stage and are randomly assigned to either Matrix group counseling only or Matrix group counseling plus contingency management. The full randomization trial will be conducted with 200 HIV-positive and 400 HIV-negative MMT patients who report moderate- and high-risk meth use on self-screening with ASSIST or have urine positive with meth metabolites. In each location, the study will stratify participant