Vyvanse (lisdexamfetamine) is a prescription medication approved by the U.S. Food and Drug Administration (FDA) primarily for treating Attention Deficit Hyperactivity Disorder (ADHD) in both children and adults. It's a stimulant that affects chemicals in the brain and nerves, improving focus, impulse control, and reducing hyperactivity. Vyvanse is unique in that it's a prodrug, meaning it needs to be metabolized by the body before it becomes active, offering a smoother, longer-lasting effect compared to some other stimulants.