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For Adults Stimulants can help regulate levels of chemical messengers in the brain, which control attention. They are considered to be the first line of treatment for ADHD. They aren't believed to be a habit-forming drug, but they can cause adverse effects, like headache and trouble sleeping. Your doctor might also prescribe guanfacine (brand names Tenex and Intuniv) or clonidine (Catapres) to decrease hyperactivity and impulsivity. These drugs have a longer duration of action than stimulants