Abstract
IntroductionSingle-dose pharmacokinetics of orbifloxacin (2.5mg/kg body weight) were determined in clinically normal female Patanwadi sheep (n=6) following intravenous and intramuscular administration. MethodsOrbifloxacin concentrations were determined by high performance liquid chromatography with ultraviolet detection. The concentration–time data were analyzed by non-compartmental kinetic method. Results and discussionFollowing a single intravenous injection, an elimination half-life (t1/2β) of 8.31±0.102h. Steady-state volume of distribution (Vdss) and total body clearance (ClB) were 3.09±0.282L/kg and 0.158±0.006L/kg/h, respectively. Following intramuscular administration, an elimination rate constant (β), the area under the curve from zero to infinity (AUC0−∞) and the mean absorption time (MAT) were 0.015±0.001h−1, 23.49±1.722μg·h/mL and 7.50±0.58h, respectively. The peak plasma concentration (Cmax) of 1.81±0.005µg/mL was achieved at 1.00±0.00h. The mean residence time (MRT) was 26.25±1.083h and the absolute bioavailability was 150.8±12.35%, respectively. Orbifloxacin could be useful for the treatment of bacterial infections in sheep that are sensitive to this drug.
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