- Patients must have an Attention-Deficit/Hyperactivity Disorder Rating Scale-IV-Parent Version:Investigator-Administered and Scored (ADHD-RS-IV-PV:IR) total score at least 1.5 standard deviations above the age/gender norm prior to randomization. They must have a Clinical Global Impression-Attention Deficit Hyperactivity Disorder-Severity Scale (CGI-ADHD-S) score greater than or equal to 4 at both the patients screening visit, prior to randomization.