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ADHD Medication - Ritalin Ritalin is a stimulant drug used to treat attention-deficit hyperactivity disorder (ADHD). It works by improving brain communication, which decreases ADHD. ADHD medications can have adverse effects, such as diminished appetite and trouble sleeping. Most of these side effects are minor and will go away on their own or over time. Dosage Ritalin boosts levels of dopamine, no