Vyvanse is a prescription medication that contains the active ingredient lisdexamfetamine dimesylate. It is primarily used to treat attention deficit hyperactivity disorder (ADHD) in children and adults, as well as binge eating disorder in adults. Vyvanse is a prodrug, meaning it is inactive until metabolized in the body, which helps reduce the potential for abuse compared to other stimulant medications. It works by increasing the levels of certain neurotransmitters in the brain to improve focus and impulse control.