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The British Journal of Psychiatry 129: 547-555 (1976)
© 1976 The Royal College of Psychiatrists

Clozapine versus perphenazine: the value of the biochemical mode of action of neuroleptics in predicting their therapeutic activity

HM Van Praag, J Korf and LC Dols

The chemical structure of a neuroleptic does not relaibly predict the exact profile of its therapeutic action. We considered the question whether the biochemical action of a neuroleptic, and specifically the ratio between DA-receptor block and NA-receptor block, might have a higher predictive value in this respect. In this context we carried out a double-blind study of the therapeutic value of clozapine and perphenazine in acute psychoses of varying symptomatology anc aetiology. There are strong indications that clozapine has only a slight inhibitory effect on transmission in central DA-ergic neurons, but markedly inhibits transmission in central NA-ergic neurons, and that the reverse applies to perphenazine. In view of these data we expected perphenazine to be a stronger antipsychotic and a weaker sedative than clozapine, and vice versa. The plausibility of this hypothesis was demonstrated. Partly also on the basis of earlier research, we concluded that the biochemical action of a neuroleptic is a more faithful predictor of its therapeutic action profile than the chemical structure.


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Copyright © 1976 The Royal College of Psychiatrists.