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- W1962555352 abstract "Cox, S. R., Liao, S., Payne-Johnson, M., Zielinski, R. J., Stegemann, M. R. Population pharmacokinetics of mavacoxib in osteoarthritic dogs. J. vet. Pharmacol. Therap. 34, 1–11. Mavacoxib (Trocoxil™) is an oral long-acting COX-2 inhibitor approved for the treatment of osteoarthritis in dogs. Two field trials were conducted in client-owned dogs suffering from osteoarthritis, with dosages of 4 mg/kg body weight (BW) (Study 1) or 2 mg/kg BW (Study 2). Mavacoxib plasma concentrations were determined from trough blood samples and from blood samples collected at 4–10 months after the last dose. A one-compartment linear model was fitted to the concentration data (1317 concentration records from 286 patients), and parameters for oral clearance (Cl/F), apparent volume of distribution (Vd/F) and their between-subject variabilities (BSV) were estimated. Covariates were included in the model based on the outcomes of stepwise regression procedures. In the final model, the typical value of Cl/F was a function of BW, age and breed. German shepherds and Labrador retrievers were found to have 31% higher values of Cl/F than patients from different breeds with similar ages and BWs. The typical value of Vd/F was found to be dependent only on BW. The two field studies appeared to differ similarly with respect to Cl/F and Vd/F. The explanation for this difference is not known, but the difference was accounted for in the final model as a 23.9% lower bioavailability in Study 2. Mavacoxib exhibited relatively broad BSV in Cl/F and Vd/F, with coefficients of variation of 47% and 19%, respectively. The typical value for mavacoxib’s terminal elimination plasma half-life (t1/2) was 44 days, but a minority of patients (approximately 5%) had empirical Bayes estimates of t1/2 exceeding 80 days. Simulations with the model indicated that the majority of patients treated with mavacoxib 2 mg/kg will maintain trough plasma mavacoxib concentrations associated with efficacy. Results of the population pharmacokinetic analysis helped to reduce the dose from 4 to 2 mg/kg and thus increased the therapeutic index for this molecule." @default.
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- W1962555352 date "2011-01-10" @default.
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- W1962555352 title "Population pharmacokinetics of mavacoxib in osteoarthritic dogs" @default.
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- W1962555352 doi "https://doi.org/10.1111/j.1365-2885.2010.01183.x" @default.
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