Abstract
Background: Hyponatremia is the most common electrolyte disorder encountered clinically. While acute and/or severe hyponatremia is commonly associated with significant symptoms, milder and more chronic forms of hyponatremia remain clinically inconspicuous. Recent evidence suggests that even milder forms of hyponatremia are associated with increased morbidity and mortality. Despite this, currently available treatments for chronic hyponatremia lack data on efficacy and/or have important limitations related to patient nonadherence, adverse side effects, and/or significant costs. Consequently, there is a clear need for investigation of alternative treatments for this common condition. Summary: Small case series conducted in Europe since the early 1980s suggest that urea, an oral osmotic diuretic that increases urinary water excretion, is safe and effective for the treatment of chronic hyponatremia. In 2016, a novel formulation of urea became available in the United States. Our group recently reported the first and only study describing the efficacy and safety of this American formulation of oral urea among hospitalized patients with hyponatremia. Key Messages: Oral urea appears to be an effective, safe, and well-tolerated therapeutic strategy in the management of chronic hyponatremia.
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