ADHD is a neurodevelopmental disorder commonly occurring in children and adolescents. However, it has recently become accepted that the symptoms of ADHD can often continue into adulthood with an estimated lifetime prevalence of ADHD in US adults of 8.1%.1 It is thought that the earliest accounts of inattention as a disorder, in children and adults, were recorded in a medical textbook by Melchior Adam Weikard in the early 1700s.