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Pharmacokinetics and plasma protein binding (in vitro) of oxytetracycline in buffalo (Bubalus bubalis).

The pharmacokinetics of oxytetracycline given in a single dose (22 mg/kg) either IV or IM was studied in 4 female buffalo calves. The half-life (t1/2) after IV administration varied between 169.02 and 216.56 minutes and that after IM administration, between 630 and 990 minutes. The drug was distributed well in the body after IM administration (Vdarea 1.18 to 2.15 L/kg). The total body clearances varied between 1.02 and 1.45 and between 1.17 and 1.49 ml/kg/min after the IV and the Im dosings, respectively. It has been proposed that oxytetracycline is excreted mainly by glomerular filtration in the buffalo species, but tubular reabsorption also may have a small part. About 42% of the drug was bound to plasma proteins at concentrations of 2 to 20 micrograms of oxytetracycline/ml. The drug dosage schedules to maintain serum levels of 0.5, 1, 2, and 5 micrograms/ml also are determined.