Department of Pharmacology, Al-Nafees Medical College, Isra University, Islamabad, Pakistan
The objective of present study was to investigate renal clearance, urinary excretion and underlying excretory mechanism of marbofloxacin in Lohi sheep. For this purpose, marbofloxacin was administered intravenously (IV) as single bolus dose (2.5 mg/kg body weight) to eight healthy sheep of Lohi breed. After start of experiment, blood and urine samples were drawn at predetermined time intervals and marbofloxacin concentrations in the samples were measured by reverse phase high performance liquid chromatography (RP-HPLC) using UV/Vis detector. The mean ± SD values of creatinine in plasma and urine were 15.37 ± 0.65 µg/ml and 246.7 ± 48.05 µg/ml, respectively. Glomerular filtration rate was 1.29 ± 0.22 ml/min/kg whereas urinary flow rate was observed to be 0.084 ± 0.016 ml/min/kg. The renal clearance of marbofloxacin in Lohi sheep was 9.45 ± 2.12 ml/min/kg. Cumulative percentage dose excreted was seen to be maximum at 24 h post drug administration. It was concluded that renal handling of marbofloxacin in Lohi sheep involved both glomerular filtration and active tubular secretion.
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