Self-administration of methylenedioxymethamphetamine (MDMA) by rhesus monkeys

Abstract

Four rhesus monkeys trained to press levers for intravenous cocaine infusions were tested with saline and (±)-3, 4-methylenedioxymethamphetamine (MDMA; 3–300 μg/kg per infusion) during daily 1-h sessions. From four to over nine times more cocaine infusions …