Subjects for this study will be drug users with a diagnosis of opioid dependence who are initiating buprenorphine therapy at a DoSA clinic or at the CHCC. The study population is expected to reflect the ethnic composition of the opioid-dependent population in the Bronx. This population is composed of 40% women, and is 24% African-American, 58% Hispanic and 17% Caucasian. Both males and females with opioid dependence who are initiating buprenorphine will be recruited for the proposed study, and, based on our previous studies, we expect to recruit high proportions of women and minorities.