Lisdexamfetamine is a central nervous system stimulant. It affects chemicals in the brain and nerves that contribute to hyperactivity and impulse control. Lisdexamfetamine is used to treat attention deficit hyperactivity disorder (ADHD) in adults and in children who are at least 6 years old. Lisdexamfetamine is also used to treat moderate to severe binge eating disorder in adults. This medicine is not to be used for obesity or weight loss.