Phase 3: Eligibility for Open-Label Phase Following completion of the Parent Training Phase, participants and their caregivers will attend two Baseline Visits (Study Visits 6 & 7) to assess continued eligibility and to start open-label treatment. At Visit 6, clinical status (including AEs) will be assessed and the ADHD-RS-IV and CGI-S and CGI-I will be administered. Criteria for continuation to the Open-Label Phase will be less than a 30% improvement from Screening on the total score of the Investigator administered ADHD-RS-IV (Preschool Version)11 and a Clinical Global Impression-Improvement (CGI-I) of 3 (minimally improved or less). For patients who are still eligible for continuation to the Open-Label Phase, a medical evaluation will be conducted, including vital signs, and collection of blood for routine blood chemistry/hematology assessment. Urine for urinalysis and urine drug screen will also be obtained.