Randomized controlled trial of a positive affect intervention for methamphetamine users.

Background: Contingency management (CM) is an evidence-based intervention providing rewards in exchange for biomarkers that confirm abstinence from stimulants such as methamphetamine. We tested the efficacy of a positive affect intervention designed to boost the effectiveness of CM with HIV-positive, methamphetamine-using sexual minority men.

Methods: This attention-matched, randomized controlled trial of a positive affect intervention delivered during CM was registered on www.