Abstract
A two-way crossover study was conducted in crossbred male calves (6–8 months old) to determine the bioavailability, pharmacokinetics and dosage regimens for a long-acting formulation of oxytetracycline (OTC-LA). The half-lives of oxytetracycline after intravenous and intramuscular administration were 7.8 h and 24 h, respectively. The volume of distribution and total body clearance values of the drug were 0.86±0.07 L and 76.1±3.3 (ml/h)/kg, respectively. The maximum concentration of the drug in the serum (4.7–7.4 μg/ml) was achieved 8–10 h after intramuscular administration. The minimum therapeutic serum concentration of drug of ≥0.5 μg/ml was maintained between 15 min and 84 h after intramuscular administration. The intramuscular bioavailability of the drug was 89.1±4.2%. The dosage regimens to maintain the minimum therapeutic serum concentrations of OTC following intramuscular administration of OTC-LA were computed.
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Kumar, R., Malik, J. Some Pharmacokinetic Parameters and Dosage Regimens for a Long-Acting Formulation of Oxytetracycline in 6- to 8-Month-Old Male Calves. Vet Res Commun 22, 533–544 (1998). https://doi.org/10.1023/A:1006193703979
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DOI: https://doi.org/10.1023/A:1006193703979