TL;DR: The behaviour of two new analgesics, benzethidine and furethidine, in a number of different tests has been compared with that of pethidine, and some differences in side-effects at equi-analgesic dosage were observed.
Abstract: The behaviour of two new analgesics, benzethidine and furethidine, in a number of different tests has been compared with that of pethidine. Some differences in side-effects at equi-analgesic dosage were observed, particularly a reduction in histamine release.