SOME ACTIONS OF CENTRALLY ACTIVE AND OTHER DRUGS ON THE TRANSMISSION OF SINGLE NERVE IMPULSES THROUGH THE ISOLATED SUPERIOR CERVICAL GANGLION PREPARATION OF THE RABBIT.

Abstract	The effect of some centrally-active and other drugs on the transmission of single nerve impulses through the isolated superior cervical ganglion preparation of the rabbit has been studied by recording both preganglionic and postganglionic action potentials. Block of conduction in the axon could be distinguished from block of the synaptic mechanism. The drugs did not appear to exert any one characteristic form of blocking action. A continuous spectrum of drug action linked an agent such as meprobamate which acted predominantly on the synapse to benactyzine which acted mainly by blocking axonal conduction. The drugs have been divided into three groups. Group I: hexamethonium, meprobamate, paraldehyde, amylobarbitone, methylpentynol and azacyclonal; these acted relatively selectively at the ganglion. Group II: N714C (the cis-isomer of chlorprothixene), prochlorperazine, methylpentynol carbamate, pipradrol, promethazine, perphenazine and procaine; the action of these drugs on the ganglion could be accounted for entirely in terms of their axonal depressant action. Group III: chlorprothixene, promazine, N720 (dihydrochlorprothixene), chlorpromazine, hydroxyzine and benactyzine; these drugs also blocked axonal conduction but in addition they appeared to exert a "facilitating" action at the ganglionic synapse. The actions of adrenaline, adrenochrome, iproniazid, ergotoxine, mescaline and lysergic acid diethylamide on transmission were also studied. The implications of the modifications of ganglionic transmission produced by these drugs is discussed.
Authors	R C ELLIOTT, J P QUILLIAM
Journal	British journal of pharmacology and chemotherapy (Br J Pharmacol Chemother) Vol. 23 Pg. 222-40 (Oct 1964) ISSN: 0366-0826 [Print] England
PMID	14228127 (Publication Type: Journal Article)
Chemical References	Barbiturates Ganglionic Blockers Hexamethonium Compounds Hypnotics and Sedatives Piperidines azacyclonol Hydroxyzine Procaine Benactyzine Meprobamate Chlorprothixene Promethazine Perphenazine Promazine pipradrol Paraldehyde Chlorpromazine Prochlorperazine
Topics	Action Potentials Animals Barbiturates Benactyzine Chlorpromazine Chlorprothixene Ganglia, Autonomic Ganglionic Blockers Hexamethonium Compounds Hydroxyzine Hypnotics and Sedatives Meprobamate Neural Conduction Paraldehyde Perphenazine Pharmacology Piperidines Procaine Prochlorperazine Promazine Promethazine Rabbits Research Superior Cervical Ganglion

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