Buy Ritalin Online is a medication that is primarily used to treat attention deficit hyperactivity disorder (ADHD) in both children and adults. It can also be used to treat narcolepsy, a condition that causes excessive daytime sleepiness. Ritalin works by balancing the chemicals in the brain, specifically dopamine and norepinephrine. By doing so, it can help improve focus, reduce impulsivity, and increase attention span. It comes in both extended-release and immediate-release forms and should only be taken as prescribed by a doctor. Some common side effects of Ritalin include nervousness, stomach pain, and trouble sleeping. It comes in 10mg and 20mg.