Lisdexamfetamine is used to treat attention deficit hyperactivity disorder (ADHD) as part of a total treatment plan, including psychological, social, and other treatments. It may help to increase the ability to pay attention, stay focused, and stop fidgeting. Lisdexamfetamine may also be used to treat binge eating disorder (BED). It may help to reduce the number of binge eating days. This medication is a stimulant. It is thought to work by restoring the balance of certain natural chemicals (neurotransmitters) in the brain. This medication is not recommended for use for weight loss due to the risk of serious side effects.