Buprenorphine Versus Methadone
"Long-term retention on OAT in trials and observational studies is suboptimal, which limits the effect of OAT with regard to reducing drug-related deaths.131 There was consistent evidence that retention was slightly better on methadone than buprenorphine across RCTs and observational studies at timepoints beyond 1 month, although few RCTs examined long-term retention.