title: Azosemide kinetics and dynamics.
abstract: Azosemide is a loop diuretic that may also affect sodium reabsorption at the proximal tubule. We gave intravenous and oral doses of the drug to normal subjects to examine its kinetic and dynamic parameters. In the fasting state a lag time of absorption of approximately 1 hr was followed by absorption t 1/2s and elimination t 1/2s of approximately 0.75 and 2 2.5 hr. Only 2% of an oral dose was excreted unchanged in the urine. After intravenous dosing the elimination t 1/2 was approximately 2 hr; 20% of a dose was recovered unchanged. Thus azosemide has an estimated bioavailability of 10%. The relationship between urinary azosemide excretion rate ("dose") and natriuretic response follows a sigmoid-shaped curve with a dose inducing half-maximal response of 9.3 +/- 2.6 micrograms/min, whereas it is 69.8, 12.1 and 1 microgram/min for furosemide, piretanide, and bumetanide respectively.
mesh_terms: D000284:Administration, Oral; D001682:Biological Availability; D006801:Humans; D007700:Kinetics; D013424:Sulfanilamides / Q000008:administration & dosage / Q000378:metabolism*; D013777:Tetrazoles; D013876:Thiophenes; D000096926:Benzenesulfonamides
chemical_list: D013424:Sulfanilamides; C018222:azosemide; D013777:Tetrazoles; D013876:Thiophenes; D000096926:Benzenesulfonamides