ADHD Stimulant Medication Stimulants can help 70 percent to 80% children and adults with ADHD. They ease symptoms by increasing dopamine and norepinephrine levels. These medications start working in 30 to 45 minutes, and last for 3 to 6 hours. They are available in liquid form or chewable tablets. Your doctor may prescribe non-stimulant drugs to accompany stimula
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