A Study of Atomoxetine for Attention Deficit and Hyperactive/Impulsive Behaviour Problems in Children With ASD

Inclusion Criteria: * Male and female outpatients between the ages of at least 6 years of age and not more than 17 years of age at visit 1 * Autistic Spectrum Disorder (DSM-IV TR) diagnosis of Autistic disorder or Asperger syndrome or PDDNOS * Clinically significant symptoms of ADHD (i.e. inattention, impulsiveness, and hyperactivity) that have been present for at least six months (for subjects older than 8 years, the onset of symptoms must be before the age of 7 years) * Medication-free for at least two weeks for all psychotropic medications (four weeks for fluoxetine or depot-neuroleptics) * Patients must also be able to swallow capsules Exclusion Criteria: * Patients who weigh less than 20 kg or greater than 60 kg at visit 2 * DSM-IV TR diagnosis of a Pervasive Developmental Disorder other than Autistic Disorder, PDD-NOS, Asperger's Disorder (e.g. Rett's Disorder, Childhood Disintegrative Disorder) * Patients who have a history of Bipolar I or II disorder, schizophrenia, psychosis * Patients who have a current diagnosis of Major Depression (with or without psychotic features), PTSD * Patients with a history of any seizure disorder (other than febrile seizures) or patients who have taken (or are currently taking) anticonvulsants for seizure control