The role of n-allylnormorphine in reversing morphine and other opiate respiratory and circulatory depressant effects is gaining wider acceptance. In order to obtain full advantage of the superior analgesic properties of morphine with minimal side effects, it was decided to mix n-allylnormorphine with each morphine administration. When equal concentrations of 5, 10, or 15 mg. of each of these drugs were mixed and injected into pediatric, geriatric, or obstetric patients, intense sedation and analgesia were produced with either slight or no effect on respiration or circulation. Only slight respiratory depression of one newborn infant resulted in this series from the administration of this analgesic mixture to the mothers in labor. The results obtained with the morphine-n-allylnormorphine mixtures are encouraging and warrant further trial.