A Method for Evaluating both Non-Narcotic and Narcotic Analgesics

A simple method has been designed for evaluating both non-narcotic and narcotic analgesics. The method is based upon the specific antagonism of analgesics to the typical “syndrome” produced by intra-peritoneal injection of 2-phenyl-1,4-benzo-quinone in mice. The antagonism occurs at doses far below those producing depression or other toxic effects. There is also a good correlation between clinical efficacy of a number of analgesics and their relative potency as established by this method. The endpoint is sharp, and the method is simple and quantitative.