Comorbid attention deficit/hyperactivity disorder (ADHD) and substance use disorder (SUD) is associated with poor treatment outcomes. This international multi-center observational prospective cohort study aimed to gain knowledge about predictors of treatment outcomes in adult SUD+ADHD patients. Data was collected from June 2017 to May 2021 at baseline, four weeks, three months, and nine months at twelve treatment services in nine countries. Main outcomes were: Treatment retention, ≥30% reduction…
