A recent increase in stimulant treatment of adolescents with attention deficit hyperactivity disorder (ADHD) has been documented. Challenges in treating adolescent ADHD with methylphenidate or dextroamphetamine include compliance with frequent dosing, abuse potential and wear-off or rebound effects. Co-morbid anxiety, occurring in at least 30 percent of ADHD youths, is associated with lower rate of response to stimulants. The effective alternatives, tricyclic antidepressants or pemoline, are each associated with rare but serious toxicity. Bupropion has recently proven effective in controlled trials. Other noradrenergic or dopamine-enhancing agents such as venlafaxine and nicotine show some benefit in open trials. The need for more options in pharmacotherapy of ADHD is evidenced by rapid adoption in clinical practice of alternative and adjunctive medication despite lack of controlled research on efficacy and safety. The indications for long-term stimulant treatment of ADHD present some controversy, and highlight a need for more research on safety and efficacy through the lifespan. Thresholds for diagnosis are much lower with DSM than with ICD, and thresholds for treatment are contentious, given the performance-enhancing effects of stimulants in normal students. The endpoint for treatment is unclear, as stimulants are also effective in adult ADHD. Based on short- and intermediate-term studies to date, stimulant medication is clearly more efficacious than cognitive and behavioral strategies for the symptoms of ADHD. Longer term research is needed to determine whether sustained stimulant therapy will reduce the adverse emotional, behavioral and academic consequences of inattention and impulsivity in adolescents and adults.