- Subject is currently receiving treatment with any of the following drug classes: Neuroleptics, Hypnotics, Antidepressants, Anxiolytic Drugs, Anticonvulsive Therapy, Budipine, Dopamine Antagonist Antiemetics (except Domperidone), Opioids, Benzodiazepines, Monoamine Oxidase (MAO) Inhibitors, Catechol-O-Methyltransferase (COMT) Inhibitors, Sedative Antihistamines, Psychostimulates, or Amphetamines. If subject has received such therapy, a Washout Period of at least 7 days prior to Baseline (Visit 2) is required before starting treatment in this study