Two long-term studies demonstrate that stimulant treatment of attention deficit hyperactivity disorder (ADHD) in young children does not increase the risk of substance abuse in early adulthood. Biederman et al. (p.
597) conducted a 10-year follow-up of boys with ADHD; 42 were treated with stimulants, and 39 were not. In early adulthood, the two groups showed no significant differences in the rates of alcohol use disorders, nicotine dependence, or other substance-related disorders. However, the duration of alcohol abuse was longer for those who had received stimulants for ADHD. Mannuzza et al. (p.
604) also performed a prospective follow-up, tracking 176 boys treated with methylphenidate for ADHD. The rates of nonalcohol substance use disorders in adulthood were similar in those who had begun taking methylphenidate at age 6 or 7 (27%) and in healthy comparison subjects (29%), but the rate was higher in those who started taking methylphenidate at ages 8—12 (44%). The association between age at first treatment and later substance abuse was accounted for by the development of antisocial personality disorder. Drs. Nora Volkow and James Swanson discuss ADHD and substance abuse in an editorial on p.
553.