Vyvanse is a brand name for a medication called lisdexamfetamine dimesylate. It is commonly prescribed to treat attention-deficit/hyperactivity disorder (ADHD) in children and adults. Vyvanse belongs to a class of drugs known as central nervous system (CNS) stimulants. It works by increasing the levels of certain neurotransmitters, such as dopamine and norepinephrine, in the brain. These neurotransmitters play a role in regulating attention, focus, and impulse control.