Buy Ritalin Online, Methylphenidate is sold under the name of Ritalin .It is a CNS stimulant used to control ADHD(attention deficit hyperactivity disorder) and narcolepsy . It may be taken Orally or applied to skin. It blocks reuptake of dopamine and norepinephrine by neurons. Adverse effect of Ritalin is euphoria, headache ,insomnia, anxiety ,weight loss etc.