Attention-Deficit Hyperactivity Disorder (ADHD) Study With Adults

Inclusion criteria: * Patient must be diagnosed with ADHD. Exclusion Criteria: * Patient has a current or past history of seizure disorder, brain injury, anorexia nervosa or bulimia. * Patient has a current diagnosis of Major Depressive Disorder (MDD). * Patient has a current primary diagnosis of, or received treatment for, Panic Disorder, Obsessive Compulsive Disorder (OCD), Posttraumatic Stress Disorder (PTSD) or Acute Stress Disorder within the previous 12 months. * Patient has a lifetime diagnosis of bipolar disorder, schizophrenia or other psychotic disorders. * Patient has a positive urine test at screening for presence of illicit drugs or alcohol abuse during the past 12 months.