title: Diuretic effect and metabolism of bumetanide in man.
abstract: Bumetanide (3-N-butylamino-4-phenoxy-5-sulfamyl-benzoic acid) is a sulfonamide congener with potent diuretic activity in man. Oral administration of 14C-bumetanide (2 mg, 22 71Ci) to 4 adult male volunteers was rapidly and almost completely absorbed (greater than 95%). Its average apparent volume of distribution was 25 L. Bumetanide induced a ceiling diuresis at 1 hr, with loss of Na+ and water for 4 to 5 hr. Loss of K+ was minimal. Bumetanide was quickly eliminated by metabolism and urinary excretion with a plasma half-life of 1.5 hr. The administered radioactivity was almost completely recovered (96%), 81% appearing in the urine and the remainder in the feces. In one subject with bilary T tube, 14.4% of the dose was excreted in the bile which suggested that the radioactivity of the feces came from the bile. Thin-layer chromatography analysis of pooled urine, bile, and fecal samples showed the elimination of bumetanide could be explained by excretion of unchanged drug and side chain oxidative metabolism and conjugation.
mesh_terms: D000328:Adult; D000368:Aged; D001646:Bile / Q000378:metabolism; D001711:Biotransformation; D002034:Bumetanide / Q000378:metabolism / Q000494:pharmacology*; D004232:Diuretics / Q000494:pharmacology*; D005243:Feces / Q000032:analysis; D006207:Half-Life; D006801:Humans; D008297:Male; D013997:Time Factors
chemical_list: D004232:Diuretics; D002034:Bumetanide