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Cefepime is a new broad-spectrum cephalosporin with excellent gram-positive and gram-negative activity including activity against Staphylococcus aureus, Pseudomonas aeruginosa, and Enterobacter cloacae. The pharmacokinetic disposition of cefepime is similar to that of ceftazidime. We compared the pharmacokinetic characteristics and the extent and duration of bactericidal activity in serum and suction-induced blister fluid after single 2-g intravenous doses of cefepime, ceftazidime, and cefoperazone given to healthy subjects. One clinical isolate each of E. cloacae, P. aeruginosa, and S. aureus was used to assess bactericidal activity. Results of the pharmacokinetic analysis were similar to previously reported data for these drugs. The high serum protein binding of cefoperazone (approximately 90%) contributed to poor blister fluid penetration. The other drugs penetrated well into this fluid compartment. Cefepime showed significantly greater bactericidal activity in serum and blister fluid against E. cloacae than the other study drugs, ceftazidime was significantly better in serum and blister fluid against P. aeruginosa, and cefoperazone was significantly better against S. aureus only in serum. None of the study drugs had significant bactericidal activity in blister fluid against S. aureus. Cefepime is a promising antimicrobial agent for the treatment of infections due to E. cloacae.

Pharmacokinetic disposition and bactericidal activities of cefepime, ceftazidime, and cefoperazone in serum and blister fluid