Click Here: https://bigpharmausa.com/ritalin-vs-concerta/ Ritalin and Concerta both contain methylphenidate, but differ in duration. Ritalin is short-acting, lasting about 3–4 hours, while Concerta is extended-release, lasting 10–12 hours. Roughly, 10 mg of Ritalin taken three times daily is equivalent to 36 mg of Concerta once daily, though adjustments depend on individual response.