The pharmacokinetics of oxytetracycline following intravenous administration in healthy and diseased pigs

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Abstract
Pijpers, A., Schoevers, E.J., van Gogh, H., van Leengoed, L.A.M.G., Visser, I.J.R., van Miert, A.S.J.P.A.M. & Verheijden, J.H.M. The pharmacokinetics of oxytetracycline following intravenous administration in healthy and diseased pigs. J. vet. Pharmacol. Therap. 13, 320–326. The pharmacokinetics of oxytetracycline (OTC) were studied in healthy pigs and in pigs endobronchially inoculated with Actinobacillus pleuropneumoniae toxins. In two groups of seven pigs OTC was administered intravenously in a single dose of 10 or 50 mg/kg, respectively. OTC was administered to clinically healthy pigs and 7 days later at 3 h after a challenge with A. pleuropneumoniae toxins. Pneumonia developed in toxin-treated pigs. In the challenged pigs there was a decreased distribution-rate constant (α) and a significantly increased elimination-rate constant (ß) (Pdß) was decreased. The elimination half-lives (t1/2ß) were approximately 6 h in the healthy pigs and 5 h in the diseased animals. There was no difference in the pharmacokinetic profile of OTC following administration of 50 mg/kg compared to 10 mg/kg. A. Pijpers, Department of Herd Health and Reproduction, PO Box 80.151, 3508 TD Utrecht, The Netherlands.

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