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  • Title: Inhibitory effect of chlorpromazine on the syndrome of hyperactivity produced by L-tryptophan or 5-methoxy-N,N-dimethyltryptamine in rats treated with a monoamine oxidase inhibitor.
    Author: Grahame-Smith DG.
    Journal: Br J Pharmacol; 1971 Dec; 43(4):856-64. PubMed ID: 4261561.
    Abstract:
    1. The hyperactivity and hyperpyrexia produced by L-tryptophan in rats treated with a monoamine oxidase inhibitor was inhibited by chlorpromazine.2. Chlorpromazine did not inhibit the increased rate of synthesis of brain 5-hydroxytryptamine (5-HT) produced by tryptophan loading.3. Hyperactivity and hyperpyrexia were also produced by 5-methoxy-N,N-dimethyltryptamine (5-MeODMT) in rats. Pretreatment with a monoamine oxidase inhibitor potentiated the hyperactivity response. Pretreatment of rats with p-chlorophenylalanine did not inhibit hyperactivity produced by 5-MeODMT.4. Chlorpromazine inhibits hyperactivity caused by tryptophan or 5-MeODMT after monoamine oxidase inhibition either by competition with 5-HT or 5-MeODMT, respectively, at receptor sites or by physiological antagonism.
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