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  • Title: Intravenous pharmacokinetics of moxifloxacin following simultaneous administration with flunixin meglumine or diclofenac in sheep.
    Author: Altan F, Corum O, Yildiz R, Eser Faki H, Ider M, Ok M, Uney K.
    Journal: J Vet Pharmacol Ther; 2020 Mar; 43(2):108-114. PubMed ID: 32043623.
    Abstract:
    In this study, the pharmacokinetics of moxifloxacin (5 mg/kg) was determined following a single intravenous administration of moxifloxacin alone and co-administration with diclofenac (2.5 mg/kg) or flunixin meglumine (2.2 mg/kg) in sheep. Six healthy Akkaraman sheep (2 ± 0.3 years and 53.5 ± 5 kg of body weight) were used. A longitudinal design with a 15-day washout period was used in three periods. In the first period, moxifloxacin was administered by an intravenous (IV) injection. In the second and third periods, moxifloxacin was co-administered with IV administration of diclofenac and flunixin meglumine, respectively. The plasma concentration of moxifloxacin was assayed by high-performance liquid chromatography. The pharmacokinetic parameters were calculated using a two-compartment open pharmacokinetic model. Following IV administration of moxifloxacin alone, the mean elimination half-life (t1/2β ), total body clearance (ClT ), volume of distribution at steady state (Vdss ) and area under the curve (AUC) of moxifloxacin were 2.27 hr, 0.56 L h-1  kg-1 , 1.66 L/kg and 8.91 hr*µg/ml, respectively. While diclofenac and flunixin meglumine significantly increased the t1/2β and AUC of moxifloxacin, they significantly reduced the ClT and Vdss . These results suggest that anti-inflammatory drugs could increase the therapeutic efficacy of moxifloxacin by altering its pharmacokinetics.
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