Question: what is the difference between methylphenidate er and la?
Answer: One dose of Ritalin lasts about four hours, so it is dosed more often, usually two to three times per day. Other forms of Ritalin are longer-acting. Ritalin-LA is a long-acting capsule (available in brand and generic) and Ritalin-SR (available in generic) is a long-acting tablet. Ritalin LA has a bi-modal release.