 1. Male or female aged 4-5 years inclusive at the time of consent with a primary diagnosis of ADHD any subtype based on a detailed psychiatric evaluation using the Mini International Neuropsychiatric Interview for Children and Adolescents MINI-KID and has undergone nonpharmacological treatment or has a severe enough condition to consider enrollment without undergoing prior nonpharmacological treatment, based on the investigators judgment or has never taken ADHD medication or has taken ADHD medication with unacceptable efficacy andor tolerability. 