Successful Treatment With Captopril of an Elderly Man With Polydipsia and Hyponatremia

Abstract

A case of severe hyponatremia in a polydipsic 64-year-old man is described. He was unsuccessfully treated with both demeclocycline and lithium carbonate. However, low-dose captopril reversed the polydipsia and resulted in sustained normal serum sodium levels. We believe the antidipsogenic effect of captopril may benefit some patients with polydipsia and hyponatremia.

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