Vyvanse (generic name: lisdexamfetamine dimesylate) is a prescription medication primarily used to treat Attention-Deficit Hyperactivity Disorder (ADHD) and Binge Eating Disorder (BED) in adults and children. It is a central nervous system stimulant that works by increasing the levels of certain neurotransmitters, dopamine and norepinephrine, in the brain, which helps improve focus, attention, and impulse control.