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Effects of a single administration of captopril on plasma and urinary vasopressin (AVP) were examined in 8 normotensive (NT) female volunteers, 17 patients with essential hypertension (EHT) and 2 patients with primary aldosteronism (PA). Orally-administered captopril (25 mg) had no effect on plasma AVP levels in the three groups. However, urinary excretion of AVP decreased significantly after use of captopril in both NT and EHT subjects (-57% and -67%, respectively), and also in PA subjects. The magnitude of reduction in urinary AVP was significantly correlated with the pretreatment levels of plasma renin activity (r = 0.85) and plasma aldosterone concentration (r = 0.88) in NT subjects. Such correlation was not found in EHT subjects. These results suggest that captopril decreases AVP secretion in both normotensive and hypertensive subjects, but the relation of the magnitude in AVP reduction by captopril to the peripheral renin-angiotensin system might be different.

japanese circulation journal

Effect of single-administration captopril on plasma and urinary vasopressin in normotensive subjects and patients with essential hypertension and primary aldosteronism.