J Vet Sci.  2007 Dec;8(4):357-360. 10.4142/jvs.2007.8.4.357.

Disposition kinetics and dosage regimen of levofloxacin on concomitant administration with paracetamol in crossbred calves

  • 1Department of Pharmacology and Toxicology, College of Veterinary Science, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana-141004, India. vkdumka@yahoo.com


The disposition kinetics of levofloxacin was investigated in six male crossbred calves following single intravenous administration, at a dose of 4 mg/kg body weight, into the jugular vein subsequent to a single intramuscular injection of paracetamol (50 mg/kg). At 1 min after the injection of levofloxacin, the concentration of levofloxacin in plasma was 17.2 +/- 0.36 microgram/ml, which rapidly declined to 6.39 +/- 0.16 microgram/ml at 10 min. The drug level above the MIC90 in plasma, was detected for up to 10 h. Levofloxacin was rapidly distributed from blood to the tissue compartment as evidenced by the high values of the distribution coefficient, alpha (17.3 +/- 1.65 /h) and the ratio of K12/K21 (1.83 +/- 0.12). The values of AUC and Vdarea were 12.7 +/- 0.12 microgram.h/ml and 0.63 +/- 0.01 l/kg. The high ratio of the AUC/MIC (126.9 +/- 1.18) obtained in this study indicated the excellent antibacterial activity of levofloxacin in calves. The elimination half-life, MRT and total body clearance were 1.38 +/- 0.01 h, 1.88 +/- 0.01 h and 0.32 +/- 0.003 l/kg/h, respectively. Based on the pharmacokinetic parameters, an appropriate intravenous dosage regimen for levofloxacin would be 5 mg/kg repeated at 24 h intervals when prescribed with paracetamol in calves.


calves; disposition; dosage; levofloxacin; paracetamol

MeSH Terms

Acetaminophen/administration & dosage/*pharmacokinetics
Anti-Bacterial Agents/administration & dosage/blood/*pharmacokinetics
Area Under Curve
Drug Therapy, Combination
Hybridization, Genetic
Injections, Intravenous/veterinary
Ofloxacin/administration & dosage/blood/*pharmacokinetics
Time Factors
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