TYPE OF TEST : LD50 - Lethal dose, 50 percent kill ROUTE OF EXPOSURE : Intravenous SPECIES OBSERVED : Rodent - mouse DOSE/DURATION : 20 mg/kg TOXIC EFFECTS : Details of toxic effects not reported other than lethal dose value REFERENCE : 31ZPAG "Synthetic Analgesics," Oxford, Pergamon Press, 1966 Volume(issue)/page/year: 2,177,1966