Attention Deficit/Hyperactivity Disorder (ADHD) is a behavioral disorder in which a child displays an excessive degree of distractibility, hyperactivity and impulsiveness. Children who have the distractibility without the hyperactivity may get a diagnosis of Attention Deficit Disorder (ADD). Research indicates that individuals with ADHD may have a problem with the neurotransmitters that allow brain cells to communicate with one another. Stimulant medications such as Ritalin are often used to manage ADHD, and are thought to work by making the neurotransmitters function more efficiently. Behavior modification and appropriate parenting techniques, whether alone or in conjunction with medication, can also be effective. Although ADHD is most commonly associated with children, it is also possible for adults to have ADHD.