Pharmacokinetic Study of Methylphenidate HCl Extended-Release Capsules in Children 4 to Under 6 Years of Age With ADHD

This will be a multi-center, open-label, single-dose, study to assess the pharmacokinetics of Aptensio XR® (methylphenidate hydrochloride extended-release) capsules in male and female children 4 to under 6 years of age with ADHD in fed condition. Screening Procedures: After obtaining written informed consent from parents, subjects will undergo a complete medical and medication history, demographic data (including sex, age, race, ethnicity, body weight (kg), height (cm), Body Mass Index (BMI) (kg/m2), physical examination, vital signs evaluation (sitting blood pressure, pulse rate, respiration rate, temperature and pulse oximetry), resting 12-lead electrocardiogram (ECG), clinical laboratory tests and concomitant medication within 28 days prior to receiving study drug. On Day 1: subjects will receive a single oral dose of Aptensio XR®.