Abstract
The pharmacokinetics of cefepime were studied following i.v. and i.m. administration of 20 mg/kg in 10 ewes. Following i.v. administration of a single dose, the plasma concentration-time curves of cefepime were best fitted using a two-compartment open model. The elimination half-life (t(1/2beta)) was 1.76 +/- 0.07 h, volume of distribution at steady-state [V(d(ss))] was 0.32 +/- 0.01 L/kg and total body clearance (Cl(B)) was 2.37 +/- 0.05 mL/min.kg. Following i.m. administration, the drug was rapidly absorbed with an absorption half-life (t(1/2ab)) of 0.49 +/- 0.05 h, maximum plasma concentration (Cmax) of 31.9 +/- 1.5 mug/mL was attained at (tmax) 1.1 +/- 0.2 h and the drug was eliminated with an elimination half-life (t(1/2el)) of 2.06 +/- 0.11 h. The systemic bioavailability (F) after i.m. administration of cefepime was 86.8 +/- 7.5%. The extent of plasma protein binding measured in vitro was 14.8 +/- 0.54%. The drug was detected in urine for 36 h postadministration by both routes.
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