Is Demerol An Opioid [Meperidine Hydrochloride] Demerol [Meperidine Hydrochloride] is the brand name for Pethidine a synthetic opioid pain medication of the phenylpiperidine class. It was first Synthesized in 1939 as a potential anticholinergic agent by the German chemist Otto Eisleb, its analgesic properties were first recognized by Otto Schaumann while working for IG Farben, Germany. Demerol [Meperidine Hydrochloride] works […]