Generally, customers can buy Ritalin online with or without a prescription worldwide. The ADHD condition that is treated with this drug is attention deficit hyperactivity disorder. It functions by altering the concentrations of specific organic compounds in the brain. Methylphenidate is a member of the stimulant drug subclass. It can improve your capacity for paying attention, sustaining attention during a task, and maintaining behavioral control. Also, it might aid in work organization and listening ability development. A specific sleep condition is also treated with this drug (narcolepsy). Ritalin (Methylphenidate) is a member of the class of drugs referred to as stimulants. Narcolepsy and Attention Deficit Hyperactivity Disorder (ADHD) are both treated with it (uncontrollable need to sleep).