Synonyms : Celltech Brand of Methylphenidate Hydrochloride, Centedrin, Cephalon Brand of Methylphenidate Hydrochloride, Equasym, Mallinckrodt Brand of Methylphenidate Hydrochloride, Metadate, Methylin, Methylphenidate Hydrochloride, Phenidylate, Ritalin, Ritalin-SR