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Plasma and synovial fluid pharmacokinetics of a single intravenous dose of meropenem in adult horses.
Journal of Veterinary Pharmacology and Therapeutics 2019 June 21
The objective of this study was to determine the pharmacokinetics of meropenem in horses after intravenous (IV) administration. A single IV dose of meropenem was administered to six adult horses at 10 mg/kg. Plasma and synovial fluid samples were collected for 6 hr following administration. Meropenem concentrations were determined by bioassay. Plasma and synovial fluid data were analyzed by compartmental and noncompartmental pharmacokinetic methods. Mean ± SD values for elimination half-life, volume of distribution at steady-state, and clearance after IV administration for plasma samples were 0.78 ± 0.176 hr, 136.1 ± 19.69 ml/kg, and 165.2 ± 29.72 ml hr-1 kg-1 , respectively. Meropenem in synovial fluid had a slower elimination than plasma with a terminal half-life of 2.4 ± 1.16 hr. Plasma protein binding was estimated at 11%. Based on a 3-compartment open pharmacokinetic model of simultaneously fit plasma and synovial fluid, dosage simulations were performed. An intermittent dosage of meropenem at 5 mg/kg IV every 8 hr or a constant rate IV infusion at 0.5 mg/kg per hour should maintain adequate time above the MIC target of 1 μg/ml. Carbapenems are antibiotics of last resort in humans and should only be used in horses when no other antimicrobial would likely be effective.
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