1. Subjects must meet DSM-5 criteria for current (three months prior to study visit) moderate to severe cocaine use disorder. Individuals may meet criteria for mild marijuana use disorder, but they must not meet criteria for substance use disorder for any other substance (except nicotine) within the 60 days prior to study participation. Due to the high comorbidity of alcohol and cocaine use disorder individuals with alcohol use disorder will be included in the study if they do not require medically supervised detoxification.