There are many different formulations available such as immediate-release tablets, sustained-release tablets, or extended-release capsules, so dosing may differ depending on the formulation used. Ritalin or Methylphenidate hydrochloride—the generic for Ritalin, is a stimulant used to treat attention deficit hyperactivity disorder (ADHD) and to manage symptoms of narcolepsy. It affects the parts of the brain and central nervous system that control hyperactivity and impulses. Ritalin is one of the trade names for the drug known as methylphenidate. Here you can buy both Ritalin 10mg & 20mg Online.