Abstract

Daily administration of ethanol in a liquid diet or by intubation were both effective in producing tolerance to the hypothermic effects of ethanol. When p-chlorophenylalanine (p-CPA) was administered in a dose previously demonstrated to maintain extensive brain serotonin (5-HT) depletion, the temperature-lowering effects of ethanol were less pronounced than in corresponding controls. The analysis of the effect of p-CPA on tolerance development took into account both initial body temperature and the degree of hypothermia. This study extends our findings with respect to the inhibitory effect of p-CPA on the development of tolerance to the motor-impairing effects of ethanol, and suggests that 5-HT may have a role in tolerance development to ethanol.

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