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Determination of the Acetylator Phenotype and Pharmacokinetics of Some Sulphonamides in Man

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Specialty Pharmacology
Date 1980 May 1
PMID 7389236
Citations 13
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Abstract

The pharmacokinetics of sulphamethizole, sulphamethoxazole, sulphadiazine, sulphapyridine and sulphadimidine have been studied in man. Renal clearance values of the metabolite N4-acetylsulphonamide are 6 to 20 times higher than those of the corresponding parent compound. The renal clearance of sulphonamides is dependent on the urine flow. N4-Acetylsulphonamide concentration-time profiles for plasma and urine have been constructed for the sulphonamides. The percentage N4-acetylsulphonamide-time profiles for plasma are excellent tools for establishing the acetylator phenotype, while those constructed from urine samples are less useful. Evidence is obtained that sulphadimidine is metabolically processes by 2 different isoenzymes, while sulphadiazine, sulphapyridine and sulphamethoxazole are processes by 1 acetylating isoenzyme. Sulphamethizole is acetylated to very little extent.

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