An Efficacy and Safety Study for JNS001 in Adults With Attention-Deficit Hyperactivity Disorder

- Patients who meet the criteria of ADHD (predominantly inattentive type [314.00], predominantly hyperactive-impulsive type [314.01], and combined type [314.01]) of DSM-IV-TR both at present and in childhood, based on Conners' Adult ADHD Diagnostic Interview for DSM-IV (CAADID) at screening

- DSM-IV Total ADHD Symptoms scores (18 items) of CAARS-O: SV score of = 24 as determined by investigator or co-investigator at baseline

- Healthy on the basis of physical examination, medical history, vital signs, 12-lead ECG and clinical laboratory tests performed at screening

- Women of childbearing potential must have a negative urine pregnancy test at screening

- Patients (and their legally-acceptable representative if patients are 18 or 19 years of age) must have signed an informed consent form (ICF), indicating that they understand the purpose of and procedures required for the study and are willing to participate in the study.

- Presence or history of co-morbid psychiatric diagnosis per DSM-IV-TR criteria of bipolar I disorder, schizophrenia, schizoaffective disorder, or severe obsessive compulsive disorders

- Presence of co-morbid psychiatric diagnosis per DSM-IV-TR criteria of pervasive developmental disorder (including autistic disorder or Asperger's disorder), suicidality, or any other diagnosis that in the judgment the investigator or co-investigator would exclude the patient from the study

- Presence of motor tics, history of Tourette's disorder, or family history of Tourette's disorder

- Known or suspected mental retardation