Attention-deficit/hyperactivity disorder (ADHD) is a chronic, neurodevelopmental disorder identified by elevated levels of inattention and/or hyperactivity-impulsivity. As outlined in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), symptoms of inattention and/or hyperactivity-impulsivity must be developmentally inappropriate and interfere with an individual’s [Page 347]functioning in more than one setting (e.g., school, home). Six or more features of inattention and/or hyperactivity-impulsivity must be present for at least 6 months and must exist prior to the age of 12 years for an individual to receive a diagnosis. ADHD has three different categories of diagnoses depending on the individual’s symptomatology: (1) combined presentation, (2) predominantly inattentive presentation, and (3) predominantly hyperactive-impulsive presentation. On diagnosis, individuals are also assigned a current severity rating (mild, moderate, severe) depending ...