Transition from adolescent to adult ADHD care can be a difficult period, with many patients losing support or disengaging from treatment. This piece highlights the ongoing impact of ADHD into adulthood, the importance of early transition planning, and practical considerations for healthcare professionals supporting patients through this stage. It also outlines treatment considerations for adults, including adherence, duration of effect, and the role of licensed treatment options such as Elvanse (lisdexamfetamine) in appropriate patients.