The purpose of this study is to assess the risks of abuse, misuse and adverse events related to high dose buprenorphine. Approximately 1250 patients taking Subutex (Schering-Plough) or its Buprenorphine High Dose (BHD) generic (Arrow Laboratories) will participate in this study. Data will be collected using physician questionnaires and self evaluation patient questionnaires at the first visit and visits at 6 and 12 months.