Depression and injection drug use often come hand-in-hand. This is especially true in populations with limited access to mental health care and with a high risk of illness and HIV transmission. Depressed injection drug users in these populations usually continue their drug use for extended periods of time, thereby further promoting the spread of HIV. This cycle has created a significant public health problem. It is necessary to explore new approaches to facilitate and maintain long-term behavior changes within this population. This study will evaluate the effectiveness of treatment with antidepressant medications in reducing HIV risk behaviors in depressed intravenous drug users.