Influence of dose on the pharmacokinetics of Cefadroxil

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Abstract
The pharmacokinetics of Cefadroxil have been studied in a crossover study involving 20 experiments in four healthy volunteers (19–24 years), after oral administration of five individual doses of 250, 500, 750, 1000 and 1500 mg of the antibiotic in capsules to each person. Plasma and urine concentrations of the antibiotic were determined microbiologically by a plate diffusion method. The antibiotic followed an open, single-compartment kinetic model. The plasma half-life was not significantly influenced by dose; the average was 1.438±0.220 h. The percentage of the antibiotic excreted in urine, too, was not significantly affected by the dose, being close to 80% of the quantity originally administered within 24 h. The values of Cmax and (AUC) increased linearly with the administered dose.

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