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Pharmacokinetics of Florfenicol and its Metabolite, Florfenicol Amine, in Broiler Chickens  

Park Byung-Kwon (College of Veterinary Medicine, Chungnam National University)
Lim Jong-Hwan (B&C Biopharm)
Kim Myoung-Seok (College of Veterinary Medicine, Chungnam National University)
Hwang Youn-Hwan (College of Veterinary Medicine, Chungnam National University)
Yun Hyo-In (College of Veterinary Medicine, Chungnam National University)
Publication Information
Journal of Veterinary Clinics / v.23, no.2, 2006 , pp. 114-118 More about this Journal
Abstract
A study on bioavailability and pharmacokinetics of florfenicol was conducted in broilers following a single intravenous (i.v.) and oral (p.o.) doses of 20 mg/kg body weight (b.w.). Florfenicol concentrations in plasma were determined by a high-performance liquid chromatography/mass spectrometry. Plasma concentration-time data after i.v. administration were analyzed by a non-compartmental analysis. Following i.v. injection, the total body clearance was $0.74{\pm}0.25L/kg/h$ and the volume of distribution at steady-state was $1.16{\pm}0.19L/kg$. Florfenicol was rapidly distributed and eliminated following i.v. injection with $1.15{\pm}1.06h$ of elimination half-life. After oral administration, the calculated $C_{max}$ values ($8.18{\pm}0.97{\mu}g/mL$) were reached at $1.33{\pm}0.29h$ in broilers. The elimination half-life of florfenicol was $1.31{\pm}0.27h$ and the absolute bioavailability (F) was 75.46% after oral administration of florfenicol. Florfenicol amine, a major metabolite of florfenicol, was detected in all broilers after i.v. and p.o. administration of florfenicol. The observed $C_{max}$ values of florfenicol amine ($3.96{\pm}2.60\;and\;2.22{\pm}1.71{\mu}g/mL$) were reached at $0.16{\pm}0.19\;and\;1.61{\pm}1.02h$ after i.v. and p.o. administration of florfenicol, respectively. Florfenicol amine was eliminated with $1.88{\pm}0.39\;and\;2.64{\pm}1.39h$ of the elimination half-life after i.v. and p.o. administration of florfenicol, respectively.
Keywords
pharmacokinetics; florfenicol; florfenicol amine; broiler chicken;
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