Renal excretion of N4-acetyl sulphanilamide and N4-acetyl sulphadimidine in goats

The renal excretion of N⁴-acetyl sulphanilamide and N⁴-acetyl sulphadimidine was studied in 19 experiments with 6 goats during continuous intravenous administration of the 2 sulphonamide derivatives. Deacetylation of both compounds takes place to a small extent only. Further it is shown that both sulphonamide derivatives are bound to plasma proteins to a greater extent than sulphanilamide and sulphadimidine. The excretion of the N⁴-acetylated sulphonamides is compared with the renal excretion of creatinine. The non-protein-bound fraction of the 2 N⁴-acetylated sulphonamides is excreted by filtration and active tubular secretion. The renal clearances of the acetyl derivatives are higher than those of the parent compounds.