Attention-deficit/hyperactivity disorder (ADHD) may affect as many as 8 million American children. The impact on an individual's psychological development, education, relationships, and family is immeasurable, and ADHD often continues into adolescence and adulthood. In the last several years, new research into pharmacologic and behavioral interventions has made a difference and only recently has adult ADHD been recognized as an entity unto its own. Clinicians are becoming more aware of the disorder and are helping children and adults understand and deal more effectively with the impact of ADHD. To help meet this challenge, Medscape has created the ADHD Resource Center, which contains a collection of the latest medical news and clinical articles on the topic, to promote a better understanding and treatment of this disorder.