Definition: A diuretic agent that blocks the renal tubular actions of aldosterone. It increases the urinary excretion of sodium and chloride, decreases the excretion of potassium and ammonium, and reduces the titratable acidity of the urine; most effectively used to potentiate the natriuretic action and reduce the potassium excretion produced by other diuretics.
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Examples: glitazone, GI cocktail, etc.