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  • Title: Comparison of the time course of the anorectic effect of fenfluramine and amphetamine with drug levels in blood.
    Author: Blundell JE, Campbell DB, Lesham M, Tozer R.
    Journal: J Pharm Pharmacol; 1975 Mar; 27(3):187-92. PubMed ID: 238002.
    Abstract:
    Time courses of the suppressive effects on food intake of (+)-amphetamine and (plus or minus)-fenfluramine in deprived rats were found to be different. Amphetamine displayed a potent initial action which rapidly decayed, and this behavioural effect was consistent with the measured blood concentration of amphetamine which showed a peak at 1 h followed by rapid clearance. For fenfluramine, the initial suppression of eating was maintained over several hours and was, for the first hour, related to the blood concentration of fenfluramine but later to an active metabolite, norfenfluramine. The study shows how drug-induced changes in feeding behaviour fluctuate over time and illustrate how single measures of food intake may overlook information about the effectiveness of anorectic drugs.
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