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  • Title: Pharmacokinetics of amikacin in the horse following intravenous and intramuscular administration.
    Author: Orsini JA, Soma LR, Rourke JE, Park M.
    Journal: J Vet Pharmacol Ther; 1985 Jun; 8(2):194-201. PubMed ID: 4020950.
    Abstract:
    The pharmacokinetics of amikacin sulfate (AK) were studied in the horse after intravenous (i.v.) and intramuscular (i.m.) administration. Serum (Cs), synovial (Csf) and peritoneal (Cpf) fluid concentrations of the drug were measured. Doses of 4.4, 6.6 and 11.0 mg/kg were given. The concentrations at 15 min following i.v. injection were 30.3 +/- 0.3, 61.2 +/- 6.9 and 122.8 +/- 7.4 micrograms/ml, respectively, for the 4.4, 6.6 and 11.0 mg/kg doses. Mean peak Cs values after the intramuscular injections occurred at 1.0 h post-injection and were 13.3 +/- 1.6, 23.0 +/- 0.6 and 29.8 +/- 3.2 micrograms/ml, respectively. The t 1/2 of amikacin was 1.44, 1.57 and 1.14 h for the 4.4, 6.6 and 11.0 mg/kg doses, respectively. In this study, minimum inhibitory concentrations (MIC) of amikacin sulfate were determined for six pathogens. Based on the MIC and the pharmacokinetic parameters, it would appear that the usual therapeutic dose of amikacin would be between 4.4 and 6.6 mg/kg twice daily and, for the more serious life-threatening infections, dosing three times a day.
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