“…Co-ingestion of benzodiazepines (BZDs) and methadone augments the physiological and subjective opioid effects of methadone (Preston et al, 1984;Lintzeris et al, 2006), and methadone-maintenance patients have high rates of BZD abuse (Stitzer et al, 1981;Darke, 1994;Gossop et al, 2003). BZD use among injecting drug users has been associated with poorer psychosocial functioning, greater levels of polydrug use, and greater likelihood of HIV risk-taking behaviors (Darke et al, 1992;Drake et al, 1993;Darke, 1994;Chutuape et al, 1997;Bleich et al, 1999;Gelkopf et al, 1999;Bleich et al, 2002). However, it is not clear whether BZD use in methadone-maintenance patients affects their response to behavioral treatments designed to reduce use of other illicit drugs, such as CM for cocaine use.…”