Stimulant medications such as Ritalin, Adderall, and Concerta are commonly used to treat ADHD. These medications work by increasing the levels of dopamine and norepinephrine in the brain, which can help to improve attention, focus, and impulse control. However, as with any medication, there are potential risks and side effects associated with stimulant use. Common side effects may include decreased appetite, trouble sleeping, and increased anxiety or irritability. More serious potential risks may include high blood pressure, heart problems, and an increased risk of addiction or abuse.