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  • Title: Therapeutic use of gentamicin in horses: concentrations in serum, urine, and synovial fluid and evaluation of renal function.
    Author: Beech J, Kohn C, Leitch M, Weinstein AJ, Gallagher M.
    Journal: Am J Vet Res; 1977 Jul; 38(7):1085-7. PubMed ID: 883716.
    Abstract:
    Serum, synovial fluid, and urine concentrations of gentamicin were measured in normal mature horses which had been given a single dose of the drug. Mean peak serum concentration (16.8 microgram/ml) occurred in horses 30 minutes after they were given a single intramuscular dose of 4.4 mg of gentamicin/kg of body weight. In horses given a smaller dose of gentamicin (1.7 mg/kg), mean peak serum concentrations of gentamicin (10.2 microgram/ml) appeared at 1 hour. Synovial fluid concentration was maximum at 2 hours for both doses; in horses given the larger dose, mean peak concentration was 6.4 microgram/ml, and in those given the smaller dose (1.7 mg/kg), 3.4 microgram/ml. Measurable concentrations of gentamicin in serum and synovial fluid persisted 8 hours. During the first 8 hours, percentages of gentamicin excreted in the urine were between 3.9 and 32.8% of the larger dose and between 3.3 and 13.4% of the smaller dose. Serum creatinine concentrations were serially measured in 10 hospitalized horses intramuscularly given 1.7 to 4.4 mg of gentamicin/kg 4 times a day' significant increase in creatinine concentration was not found.
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