Attention deficit hyperactivity disorder (ADHD) is a common psychiatric disorder in children that often leads to significant impairment of the child’s social and family life. A large number of children with ADHD suffer from comorbid oppositional defiant disorder: these children are even more difficult for parents and teachers to handle, and show increased risks of academic failure. The exact causes of ADHD are unclear; ADHD treatment, perforce, is bound to focus on addressing symptoms – mostly by means of medication like methylphenidate and behavioural therapy.