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  • Title: Pharmacokinetics and endometrial tissue concentrations of ticarcillin given to the horse by intravenous and intrauterine routes.
    Author: Spensley MS, Baggot JD, Wilson WD, Hietala SK, Mihalyi JE.
    Journal: Am J Vet Res; 1986 Dec; 47(12):2587-90. PubMed ID: 3800116.
    Abstract:
    Plasma and endometrial tissue concentrations of ticarcillin were measured in healthy mares. In the first of the 3 separate phases comprising the study, ticarcillin disodium (30 mg/kg) was administered IV. The mean peak concentration in endometrial tissue, 12.9 micrograms/g, was attained at 30 minutes. The plasma half-life of the drug in the 6 mares was 0.83 +/- 0.22 hour. Six grams of the drug was diluted in 250 ml of sodium chloride injection USP (2nd phase) and in 60 ml of sodium chloride injection USP (3rd phase). These dilutions were administered by intrauterine infusion. In phase 2, the mean peak concentrations of the drug in plasma and endometrium were 2.76 micrograms/ml and greater than 150 micrograms/g, respectively, at 60 minutes after it was administered. Endometrial concentrations greater than 150 micrograms of ticarcillin/g persisted through 2 hours after the drug was administered. Mean peak plasma and endometrial concentrations of the drug in phase 3 were 2.78 micrograms/ml and greater than 150 micrograms/g at 45 and 30 minutes after administration was done, respectively. At 1 hour after the drug was administered, endometrial concentrations of ticarcillin were significantly higher (P less than 0.01) after the drug was infused intrauterinely in the 250-ml volume than those after the 60-ml volume was infused. It was concluded that the volume of fluid in which the drug was infused into the uterus markedly influenced the duration of concentrations greater than 20 micrograms/g in endometrial tissue.
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