cross the former iron curtain. This contribution covers the wide and complex scene of drug problems and addiction as a whole. It gives researchers an opportunity to obtain background information on the spread of HIV and AIDS among intravenous drug users as well as on the clinical and psychological effects of HIV-1 infection and AIDS in Europe. The topics reviewed include surveys of intravenous drug use, HIV prevalence, detoxification, risk reduction, changing health behaviors, evaluating AIDS interventions and the impact of methadone maintenance treatment. This monograph will be of value to all clinicians, researchers, and policy makers who are concerned with the connection between intravenous drug use and AIDS.