Research suggests that around 8 percent of children between the ages of 2 and 17 in the United States, as well as 4 percent of adults, are diagnosed with Attention-Deficit Hyperactivity Disorder (ADHD). Boys are about two and a half times more likely than girls to receive a diagnosis. Standard treatments, including behavioral therapy and medications, have been effective in alleviating symptoms for most individuals. Stimulant medications, which are most commonly prescribed, positively impact 70