Safety and Tolerability Study of SPD489 in Preschool Children Aged 4-5 Years, Diagnosed With Attention-deficit/Hyperactivity Disorder

This study is a long-term, open-label study where participants who participated in an antecedent SPD489 study (SPD489-211 \[NCT02402166\] or SPD489-347 \[NCT03260205\]) or through direct enrollment. Participants entering into this study will be classified as either a roll-over participants or a direct-enrolled participants.