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• W2578797650 abstract "The use of antibiotics is necessary to treat bacterial diseases. Determination of optimal dosage in the target animals is increasingly being recognized as vital for maximizing efficacy and minimizing the risk of resistance, so this study aimed to evaluate the pharmacokinetics/pharmacodynamics (PK/PD) of levofloxacin in broilers. Using a parallel study design, each group of animals (n = 20) received 5 mg/kg of levofloxacin intravenously (IV) and orally (PO). Plasma, serum and tissues were collected for PK and PD studies. Plasma concentrations of levofloxacin were determined by HPLC. Minimal inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) were determined against E. coli, isolated in clinical broilers. Ex vivo antibacterial activity was evaluated using the time killing method. Mean values of terminal half-life for IV and PO groups were 6.93 and 8.09 h, respectively. Following oral administration, the peak plasma concentration was achieved at 0.88 h (Tmax). Mean value of oral bioavailability was 123.25%. Levofloxacin residues were found in all the tissues tested (muscle, liver, kidney and lung). Plasma concentration above 8 × MIC lead to eradication of E. coli (incubation period of 24 h). The results of ex vivo growth inhibition curves were consistent with the in vitro time-kill study. Levofloxacin showed dependent plasma concentration antibacterial activity against a clinical isolate of E. coli. According to the assessment of PK/PD relationship, administration of 5 mg/kg of levofloxacin seems to be effective in killing E. coli. Also, simulated optimal dose based on the ex vivo PK/PD approach was 2.9 mg/kg/day (bactericidal) to 4.3 mg/kg/day (eradication) PO against E. coli (MIC = 0.125 μg/ml)." @default.
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• W2578797650 date "2017-06-01" @default.
• W2578797650 modified "2023-09-27" @default.
• W2578797650 title "Ex vivo antibacterial activity of levofloxacin against Escherichia coli and its pharmacokinetic profile following intravenous and oral administrations in broilers" @default.
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• W2578797650 doi "https://doi.org/10.1016/j.rvsc.2017.01.003" @default.
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