Metoclopramide increases plasma aldosterone concentration in man

The Journal of Clinical Endocrinology and Metabolism
G NorbiatoC Moroni


Plasma Aldosterone (PA) response to metoclopramide (10 mg i.v.) was studied in 11 normal, 2 hypophysectomized subjects and in one patient with bilateral adrenal hyperplasia. All the subjects were kept on a normal sodium and potassium intake. Four normal subjects were pretreated with 1 mg of dexamethasone in order to inhibit endogenous ACTH. In all subjects metoclopramide elicited a prompt rise of PA comparable to that obtained with angiotensions or ACTH. No significant change of blood pressure, serum electrolytes, plasma renin activity, Plasma Cortisol (PC) was detected. The lack of PC response to metoclopramide and the PA increase in dexamethasone pretreated subjects rule out an ACTH mediated effect. The increase of PA in hypophysectomized subjects, in whom metoclopramide did not stimulate any prolactin release, rules out a prolactin mediated effect. Metoclopramide increases plasma aldosterone concentration probably via a direct action on the adrenal glomerular zone or throught another unknown mechanism.


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