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The interaction potential between cefepime and amikacin was investigated in a steady-state pharmacokinetic study in 16 healthy male subjects. Eight subjects (group A) received a first course of 2,000 mg of cefepime; this was followed by a second course of 2,000 mg of cefepime with 300 mg of amikacin and a third course of 2,000 mg of cefepime. Eight other subjects (group B) received a first course of 300 mg of amikacin, a second course of 300 mg of amikacin with 2,000 mg of cefepime, and a third course of 300 mg of amikacin. Each course consisted of four consecutive doses administered every 8 h as 30-min intravenous infusions. Serial plasma and urine samples, which were collected after administration of the fourth dose of each course, were assayed for cefepime and/or amikacin by validated high-performance liquid chromatographic assays. Trough levels of cefepime and amikacin indicated that these antibiotics attained a steady state prior to administration of the fourth dose of each course. Key pharmacokinetic parameters for each antibiotic were determined by noncompartmental methods. The peak concentrations of cefepime and amikacin in plasma when the drugs were given alone were about 160 and 27 micrograms/ml, respectively. Levels of each antibiotic in plasma declined, with an apparent half-life of approximately 2.2 h. Urinary recovery of cefepime and amikacin accounted for more than 85% of the administered dose of each antibiotic. Mean renal clearances for cefepime and amikacin ranged from 79 to 95 ml/min and suggested that glomerular filtration is the primary excretion mechanism. The results of the statistical analyses indicated that the pharmacokinetic parameters of cefepime following the concurrent administration of amikacin and following the discontinuation of the amikacin following the concurrent administration of cefepime and following the discontinuation of the cefepime therapy were not significantly altered. Cefepime and amikacin can be coadministered to patients with normal renal function by using the standard recommended dosing regimens.

Lack of pharmacokinetic interaction between cefepime and amikacin in humans