Aims: Attention-deficit/hyperactivity disorder (ADHD) medication is frequently associated with adverse events (AEs), but limited real-world data exist regarding their costs from a payer’s perspective. Therefore, this study evaluated the healthcare costs associated with common AEs among adult patients treated for ADHD in the US.Materials and methods: Eligible adults treated for ADHD were identified from a large US claims database (10/1/2015─9/30/2021). A retrospective cohort study design was used…