PMID: 3771340Oct 1, 1986Paper

Pharmacokinetic adjustment of gentamicin dosing in horses with sepsis

Journal of the American Veterinary Medical Association
J E Sojka, S A Brown

Abstract

Serum gentamicin concentrations were measured and pharmacokinetic values were calculated for 12 equine patients receiving parenteral gentamicin therapy. Horses were selected for monitoring of gentamicin pharmacokinetics if they met several criteria of high risk for gentamicin-induced toxicosis. Two blood samples were obtained, one immediately before gentamicin dosing and one at 1 hour after dosing. Gentamicin serum concentrations were analyzed and dosage adjustments were made on the basis of calculated one-compartment pharmacokinetic values. Nine of the 12 horses required dosage adjustment to optimize therapeutic concentrations. Even for horses for which there was no evidence of decreased renal function, variation in the disposition of gentamicin was substantial. Because of the larger volume of distribution in foals, an initial dosage of 3 mg/kg every 12 hours was found to best approximate target concentrations. Therefore, published standard dosages were a poor means of achieving desired peak and trough concentrations in many animals. Seemingly, for optimal treatment of horses with sepsis, gentamicin dosage adjustments based on the patient's pharmacokinetic values is required.

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