Increased non-fatal overdose risk associated with involuntary drug treatment in a longitudinal study with people who inject drugs.

Abstract

To assess the effect of involuntary drug treatment (IDT) on non-fatal overdose among people who inject drugs (PWID). Longitudinal study. Tijuana, Mexico. Baseline sample of 671 PWID included 258 (38.4%) women and 413 (61.6%) men. Primary independent variables were reported recent (i.e. past 6months) non-fatal overdose event (dependent variable) and IDT. Substance use the day of the non-fatal overdose was also examined. From 2011 to 2017, 213 participants (31.7%) reported a recent non-fatal overdose and 103 (15.4%) reported recent IDT. Heroin, in combination with methamphetamine and tranquilizers, were the drugs most reported at the day of the event. IDT significantly increased the odds of reporting a non-fatal overdose event [adjusted odds ratio (aOR)=1.76; 95% confidence interval (CI)=1.04-2.96]. Odds of non-fatal overdose also increased independently for each additional injection per day (aOR=1.05; 95% CI=1.02-1.08), recent tranquilizer use (aOR=1.92; 95% CI=1.41-2.61) and using hit doctors (aOR=1.68; 95% CI=1.29-2.18) and decreased with age (aOR=0.97 per year, 95% CI=0.95-0.99). Recent involuntary drug treatment in Mexico is a risk factor for non-fatal drug overdose.