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Renal sites of action of azosemide
Author(s) -
Brater D. Craig
Publication year - 1979
Publication title -
clinical pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.941
H-Index - 188
eISSN - 1532-6535
pISSN - 0009-9236
DOI - 10.1002/cpt1979254428
Subject(s) - chemistry , reabsorption , pharmacology , sodium , medicine , organic chemistry
Azosemide is a new monosulfamyl diuretic with potency and spectrum of effects similar to those of furosemide. Eight normal subjects were studied with clearance techniques during water loading and during hydropenia to assess azosemide's site of action. Solute free water reabsorption decreased from 3.1 ± 0.3 to 0.5 ± 0.9 ml/min after azosemide (p < 0.05), indicating an effect of azosemide at the ascending limb of the loop of Henle. During water loading, despite significant 3.5‐fold increases in fractional excretion of sodium and chloride, the per cent increase in free water formation, C H20 /C IN × 100 was not significantly changed by azosemide (10.4 ± 1.4 control and 14.8 ± 3.1 after azosemide). This unchanged C H20 /C IN × 100 occurred despite increased osmolal clearance after azosemide, from 2.6 ± 0.4 to 3.8 ± 0.4 ml/min (p < 0.02), indicating that azosemide increased delivery of solute to the diluting segment. Evidence is discussed which implies that azosemide inhibits solute transport of the thick ascending limb of the loop of Henle, but may also affect more proximal sites.