Phase 3 Randomized Double-Blind Placebo-Controlled Study of NRP104 in Children Aged 6-12 With ADHD

Inclusion Criteria: * primary diagnosis of ADHD combined subtype or the predominantly hyperactive-impulsive subtype based on a psychiatric evaluation that reviews DSM-IV criteria * functioning at age appropriate levels intellectually * blood pressure measurements within the 95th percentile for their gender, height and age * ECG results are within the normal range Exclusion Criteria: * comorbid psychiatric diagnosis (such as psychosis, bipolar illness, pervasive developmental disorder, severe obsessive compulsive disorder, severe depressive or severe anxiety disorder) or other symptomatic manifestations * history of seizures (exclusive of febrile seizure), a tic disorder, or a family history of Tourette's disorder * weighs less than 55 lbs (25 kg)or is significantly overweight or obese * clinically significant ECG abnormality * documented allergy or intolerance to amphetamines