HIV Treatment as Prevention: Primer for Behavior-Based Implementation summarizes the scientific evidence for advancing the use of antiretroviral therapies for HIV prevention. The evidence makes clear that HIV treatments can prevent HIV transmission, but will fail if behavioral aspects of treatment and HIV transmission are ignored.   Of greatest concern are medication adherence and risks for contracting other sexually transmitted infections. Placing HIV treatment within the context of behavioral interventions for maintaining medication adherence and reducing sexual risk behaviors is therefore essential to the future of HIV prevention.   HIV Treatment as Prevention: Primer for Behavior-Based Implementation highlights two pioneering behavioral interventions aimed at maximizing the effects of antiretroviral therapies for preventing HIV transmission. One of the interventions, developed by the Author's research team, is discussed in detail and the intervention manual is included as an Appendix.