Ritalinic acid is a primary blood metabolite of methylphenidate, a psychostimulant sold under trade names Concerta and Ritalin. This Certified Snap-N-Spike Solution is applicable for use in LC/MS or GC/MS applications for urine drug testing, clinical toxicology, and forensic analysis. Methylphenidate is prescribed for the treatment of attention-deficit hyperactivity disorder (ADHD), tachycardia, and narcolepsy.