Comparison of HIV Clinic-based Treatment With Buprenorphine Versus Referred Care in Heroin-dependent Participants

The purpose of this study is to compare the effectiveness of two approaches to treating HIV-infected patients who are addicted to opioid drugs (e.g., heroin) in an inner-city HIV clinic. The two approaches are: * Case management and referral - participants are managed by a case manager and referred to a specialized drug treatment center where they receive counseling and medications for opioid-dependence (e.g., methadone or buprenorphine); or * Clinic-based treatment - participants receive counseling and treatment with buprenorphine at the HIV clinic.