Development of sulphonamide-trimethoprim combinations for urinary tract infections. Part 2: Comparative pharmacokinetics of five sulphonamides.

The pharmacokinetics and renal excretion of the sulphonamides sulphachloropyridazine, sulphadiazine, sulphaisodimidine, sulphamerazine, and sulphamethoxazole were investigated in a cross-over study with doses of 800 mg each. The serum half-life, urine levels, distribution volume, protein binding and potential antibacterial activity in the urine renders sulphadiazine the preferred component in a combination tablet together with trimethoprim for the treatment of urinary tract infections.