It was once thought that attention-deficit/hyperactivity disorder (ADHD) did not persist into adolescence, but results from two prospective studies suggest otherwise.1 3 The results of a meta-analysis suggest a 15% persistence rate of ADHD into adolescence when the full Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV) diagnostic criteria are used.3 However, it has been postulated that persistence rates of ADHD into adolescence would be much higher if adolescents meeting the partial remission criteria were also included. 4 With this in mind, a recent study of 157 individuals who had been diagnosed with ADHD between the ages of 6 and 15 years found that on the basis of parents' reports, 60% of these individuals still met the DSM-IV criteria for ADHD 5 years after diagnosis.5 There would therefore appear to be convincing evidence of noteworthy persistence rates into adolescence for both full DSM-IV criteria and partial-remission ADHD.Longitudinal studies of children with ADHD indicate that the majority of individuals diagnosed with the disorder during childhood continue to exhibit clinically significant symptom levels during adolescence. A recent study found that in a sample of 296 individuals diagnosed with DSM-IV ADHD at a mean age of 6 years, 68.8% still had persistent ADHD between the ages of 11 and 17 years.6 Most adolescents suffering from ADHD report higher levels of emotional, social and scholastic impairment than their non-ADHD peers.7 Moreover, psychiatric co-morbidities appear to be the norm rather than the exception among adolescents diagnosed with ADHD. 8 The most commonly occurring co-morbid conditions are reported to be oppositional defiant disorder (ODD), conduct disorder (CD), mood disorders, anxiety disorders, learning disorders and substance abuse disorders. Co-morbid ODD and/or CD have been reported in Objectives. Given the paucity of research on adolescent attention-deficit/hyperactivity disorder (ADHD), this study aimed to establish the prevalence of Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV) ADHD in a cohort of South African adolescents who had been diagnosed with the disorder in childhood. It also aimed to establish the prevalence of psychiatric co-morbidities and adjustment difficulties in this sample.Method. Data regarding age of diagnosis, current ADHD status, current ADHD-related pharmacological management, current psychopathology and current adjustment were gathered from 64 adolescents and their guardians via self-report questionnaire. Descriptive statistics were calculated with regard to current ADHD status, co-morbid psychopathology and adjustment difficulties, as well as current ADHD-related medication.Results. According to parent reports, 59.38% of the sample met DSM-IV criteria for ADHD Inattentive subtype, while 37.50% met the criteria for ADHD Hyperactive/Impulsive subtype. Of the adolescents, 64.06% were still using stimulant medication. Based on the adolescent self-report, 43.75% of the sample had clinically significan...