A Study of Dex-methylphenidate Extended Release in Children (6-12 Years) With Attention-Deficit/Hyperactivity Disorder (ADHD)

Exclusion Criteria

• •Parent or guardian unable or unwilling to complete the Conner's ADHD/DSM-IV Scale for Parents (CADS-P) and the Daily Diary Card
• •Diagnosed with a tic disorder or Tourette's syndrome
• •History of seizure disorder
• •The presence of a known medical condition that would preclude the use of methylphenidate. A history (within the past year) or presence of clinically significant cardiovascular, cerebrovascular, renal, hepatic, gastrointestinal, pulmonary, immunological, hematological, endocrine, or neurological disease
• •ALT, AST, GGPT or serum creatinine greater then 2X the ULN at Screening
• •A history of psychiatric illness or substance use disorder (e.g., schizophrenia, bipolar disorder, autism, abuse or dependence, depression, severe Conduct Disorder or severe Oppositional defiant disorder)
• •Subjects who have participated in an investigational trial within the past 4 weeks (28 days) are excluded
• •Subjects who are currently taking antidepressants or other psychotropic medication
• •Subjects who have initiated psychotherapy during the three months prior to randomization
• •Subjects with a positive urine drug screen
• •Subjects who have a history of poor response or intolerance to methylphenidate or d-methylphenidate