Excretion Immediately after oral dosing of radiolabeled methylphenidate in people, about 90% of the radioactivity was recovered in urine. The primary urinary metabolite was ritalinic acid, accounting for approximately 80% with the dose. The primary compound is a typical twoº-amine, and also the three close to it are characterized by https://halleg321obm3.eqnextwiki.com/user