Vyvanse (lisdexamfetamine dimesylate) is a prescription medication primarily used to treat Attention Deficit Hyperactivity Disorder (ADHD) in children and adults, as well as moderate to severe binge eating disorder in adults. It is a stimulant that affects chemicals in the brain and nerves contributing to hyperactivity and impulse control. Vyvanse is a prodrug, meaning it is inactive until metabolized in the body, which helps to reduce potential misuse. Common side effects include decreased appetite, dry mouth, insomnia, and anxiety. It is classified as a Schedule II controlled substance due to its potential for abuse and dependence.