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[Spironolactone combined with chlorthalidone in the treatment of essential arterial hypertension].

The antihypertensive effect and the tolerance of the association of spironolactone and chlorthalidone were evaluated clinically and by numerous laboratory examinations in a group of 18 patients affected with non-complicated essential hypertension. All the patients were treated for 30 consecutive days with chlorthalidone (100 mg/day) and then for another 30 days with the two drugs administered contemporaneously (100 mg/day of spironolactone + 100 mg/day chlorthalidone). The balanced combination of the two drugs showed to be significantly more active than the treatment with just chlorthalidone and the margin of safety wider; the therapeutic activity showed to be independent from the variations of the plasma renin activity.