Do not take a larger dose, take it more often, take it for a longer time, or take it
in a different way than prescribed by
your doctor. If you take too much
lisdexamfetamine, you may find that the medication no longer controls your symptoms, you may feel a need to take large amounts of the medication, and you may experience symptoms such as rash, difficulty falling asleep or staying asleep, irritability, hyperactivity, and unusual changes in your personality or behavior.