What is the main active ingredient in Vyvanse?

The main active ingredient in Vyvanse is lisdexamfetamine dimesylate. It is a prodrug, meaning it is converted into the active form, dextroamphetamine, in the body after ingestion. Vyvanse is primarily used to treat attention deficit hyperactivity disorder (ADHD) and binge eating disorder. Its extended-release formulation allows for a gradual increase in medication levels throughout the day.