A Safety and Tolerability Study of ABT-089 in Children With Attention-Deficit/Hyperactivity Disorder (ADHD)

Inclusion Criteria: * The subject was randomized into Base Study (M06-888 or M10-345) and completed the Treatment Period. * If female, subject must be practicing at least one method of birth control throughout the study. * If female, the result of a pregnancy test is negative. * The subject is judged to be in generally good health. Exclusion Criteria: * The subject experienced a serious adverse event in Base Study (M06-888 or M10-345) that the investigator considered "possibly" or "probably related" to study drug. * The subject has taken any ADHD medication between the last dose of study drug in Study M06-888 or M10-345 and the first dose of study drug in the current study. * The subject has a positive urine drug screen for alcohol or drugs of abuse. * The subject anticipates a move outside the geographic area.