Overview Safety and Efficacy of SPD503 in Treating ADHD in Children and Adolescents Aged 6-17 Status: Completed Trial end date: 2004-10-07 Target enrollment: Participant gender: Summary The purpose of this study is to determine the efficacy of SPD503 compared to placebo in the treatment of children and adolescents aged 6-17 with ADHD. Phase: Phase 3 Details Lead Sponsor: ShireTreatments: Guanfacine