Lisdexamfetamine, most commonly sold under the brand name Vyvanse and Elvanse among others, is a stimulant medication that is used to treat attention deficit hyperactivity disorder in children and adults, cognitive disengagement syndrome , and for moderate-to-severe binge eating disorder in adults. Lisdexamfetamine is taken by mouth. Its effects generally begin within two hours and last for up to 14 hours. In the United Kingdom, it is usually less preferred to methylphenidate for the treatment of children.