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Pharmacokinetics and Oral Bioavailability of Sulfadiazine and Trimethoprim in Broiler Chickens

Abstract

Sulfonamides and trimethoprim are chemotherapeutics that are extensively used in various animal species. Little information about the pharmacokinetics of these compounds in chickens exists in the literature. In this study, a new commercial formulation of sulfadiazine in combination with trimethoprim was administered both intravenously and orally, according to a crossover design, to healthy, 7-week-old broilers. The plasma concentrations of the drugs were determined by validated high-performance liquid chromatographic methods, and pharmacokinetic parameters were calculated. After intravenous or oral administration of trimethoprim (6.67 mg/kg body weight) and sulfadiazine (33.34 mg/kg body weight), both active substances were rapidly eliminated from the plasma. There was a mean half-life of 1.61 h for trimethoprim and 3.2 h for sulfadiazine. The apparent volumes of distribution (2.2 and 0.43 L/kg, respectively, indicated that the tissue distribution of trimethoprim was more extensive than that of sulfadiazine. The oral bioavailability was approximately 80% for both components.

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Baert, K., De Baere, S., Croubels, S. et al. Pharmacokinetics and Oral Bioavailability of Sulfadiazine and Trimethoprim in Broiler Chickens. Vet Res Commun 27, 301–309 (2003). https://doi.org/10.1023/A:1024084108803

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  • DOI: https://doi.org/10.1023/A:1024084108803

  • chickens
  • route of administration
  • sulfadiazine
  • tissue distribution
  • trimethoprim