[Study on the pharmacokinetics of cefepime (II)].
The pharmacokinetics of 14C-cefepime dihydrochloride (14C-CFPM), was studied in dogs after single intravenous administration at a dose of 20 mg/kg. Protein binding was also investigated both in vitro and in vivo. 1. Blood level of radioactivity was 83.53 microns eq./ml at 5 minutes after single intravenous administration and declined biexponentially thereafter. The values of AUC and T1/2 were 229 microns eq.(.)hr/ml and 90 hours, respectively. 2. Urinary and fecal excretion rates were 95.1% and 2.7%, respectively. 3. The in vitro protein binding at 1 to 100 microns/ml of drug concentration was 7.9 to 12.7% in rat, 12.4 to 18.6% in human, and 12.5 to 14.5% in dog. In vivo protein binding, which increased with time after administration, was 10.8 to 92.9% in rat and 17.5 to 64.9% in dog at 5 minutes to 6 hours.
Nakanomyo
H
H
Preclinical Research Laboratories, Briston-Myers Squibb K.K.
Esumi
Y
Y
Takaichi
M
M
Seki
H
H
Ninomiya
S
S
Okamura
Y
Y
Sudo
Y
Y
D000818:Animals; D001798:Blood Proteins / Q000378:metabolism; D000077723:Cefepime; D002511:Cephalosporins / Q000008:administration & dosage / Q000378:metabolism / Q000493:pharmacokinetics*; D004285:Dogs; D006801:Humans; D007275:Injections, Intravenous; D008297:Male; D011485:Protein Binding; D051381:Rats; D017207:Rats, Sprague-Dawley
D001798:Blood Proteins; D002511:Cephalosporins; D000077723:Cefepime