Dataset from A Phase 3, Open-label, Multicentre Study to Provide Access to Guanfacine Hydrochloride Extended-release for European Subjects With Attention-deficit/Hyperactivity Disorder (ADHD) Who Participated in Study SPD503-315 or SPD503-316

For subjects in Europe that have already participated in either Study SPD503-315 or SPD503-316. This is an extension study that will allow participants access to Extended-release Guanfacine Hydrochloride (HCl) for up to 2 years. This study will help the sponsor evaluate long-term safety and tolerability of Extended-release Guanfacine HCl (SPD503).