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KMID : 0893420060070040333
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Journal of Veterinary Science
2006 Volume.7 No. 4 p.333 ~ p.337
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Pharmacokinetics, urinary excretion and dosage regimen of levofloxacin following a single intramuscular administration in cross bred calves
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Vinod K. Dumka
Anil K. Srivastava
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Abstract
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The pharmacokinetics and urinary excretion following single intramuscular administration of levofloxacin at a dose of 4 mg/kg was investigated in seven male cross bred calves. Appreciable plasma concentration of levofloxacin (0.38 ± 0.06 μg/ml) was detected at 1 min after injection and the peak plasma level of 3.07 ± 0.08 μg/ml was observed at 1 h. The drug level above MIC90 in plasma was detected up to 12 h after administration. Rapid absorption of the drug was also evident by the high value of the absorption rate constant (2.14 ± 0.24 /h). The overall systemic bioavailability of levofloxacin, after intramuscular administration, was 56.6 ± 12.4%. The high value of AUC (7.66 ± 0.72 mg . h/ml) reflected the vast area of body covered by drug concentration. Extensive distribution of the drug into various body fluids and tissues was noted by the high value of Vdarea (1.02 ± 0.05 l/kg). The high ratio of AUC/MIC (76.6 ± 7.25) obtained in this study indicated excellent clinical and bacteriological efficacy of levofloxacin in calves. The elimination half-life and MRT were 3.67 ± 0.4 h and 5.57 ± 0.51 h, respectively. The total body clearance (ClB) was 204.9 ± 22.6 ml/kg/h. On the basis of the pharmacokinetic parameters, a suitable intramuscular dosage regimen for levofloxacin in calves would be 1.5 mg/ kg repeated at 12 h intervals.
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KEYWORD
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calves, dosage, levofloxacin, pharmacokinetics, urinary excretion
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