Ritalin is a prescription medication primarily used to treat ADHD and narcolepsy. It works by increasing dopamine and norepinephrine levels in the brain, which helps improve focus, concentration, and impulse control. As a controlled substance, Ritalin cannot be purchased over the counter and requires a doctor's prescription to obtain legally. If you're considering Ritalin for ADHD or narcolepsy, it's important to consult with a healthcare provider who can offer personalized advice based on your needs.