 Poor adherence to complicated antiretroviral ARV drug regimens is one of the most pressing behavioral problems in the clinical management of HIV infected persons. Recent medical advances have made it possible to maintain tighter control of viral replication, allowing people with HIV to live longer, healthier lives. However, the complexity of ARV drug regimens and drug side effects make medication adherence problematic. Deviations from the prescribed regimen may allow the virus to resume rapid replication and develop drug resistant mutations that could render the prescribed drugs useless. This study will evaluate the efficacy of a 6-month, theory-based behavioral intervention to enhance adherence to antiretroviral treatment regimens. HIV-related attitudes, depressive symptoms, coping strategies, and social support will also be assessed to examine theoretical assumptions regarding the causal relationship between psychosocial constructs and medication adherence. 