The indirect sympathomimetic activity of etilefrine — a comparison with tyramine and ephedrine using [3H]noradrenaline

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Abstract
The indirect sympathomimetic activity of etilefrine has been examined using the ventral caudal artery of the rat. This vessel has a rich sympathetic innervation and lends itself to studies on [3H]noradrenaline efflux from these sites. Etilefrine possessed significant indirect activity on the artery and this action, although less than that of tyramine, was equivalent to that caused by ephedrine. Pretreatment of the vessels with a mixture of iproniazid, doca, cocaine and U0521 (3′,4′-dihydroxy-2-methyl propiophenone) significantly enhanced[3H]-noradrenaline efflux from the artery.

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