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- W2092126139 abstract "The pharmacokinetics of intravenously and orally administered enrofloxacin was determined in fingerling rainbow trout (Oncorhymhur mykiss). Doses of 5 or 10 mg enrofloxacin /kg body weight were administered intravenously to 26 fish for each dose and blood was sampled over a 60-h period at 15°C. Two groups of fish were treated orally with 5, 10, or 50 mg/kg (80 fish/dose at each temperature) and held at 15°C or 10°C during the 60-h sampling period. Following intravenous administration, the serum concentration—time data of enrofloxacin in rainbow trout were best described by a two-compartment open model for both doses of 5 and 10 mg enrofloxacin/kg. The hybrid rate constants a and β did not differ between doses. The distributional phase was rapid with a half-life of 6–7 min for both doses. Overall half-lives of elimination were 24.4 h (95% CI = 20.2–30.8) and 30.4 h (24.241.0), respectively, for the 5– and 10-mg/ kg doses. A large Vd(area) was observed following dosing of either 5 or 10 mg enrofloxacin/kg,: 3.22 and 2.56 l/kg, respectively. Whole body clearance for 5 mg/kg was 92 ml/h.kg and 58 ml/h-kg at the 10-mg/kg dose. Following oral administration, the serum concentration—time data for enrofloxacin were best described as a one-compartment open model with first-order absorption and elimination. Apparent Ka over all doses at 10°C averaged 62% less than apparent Ka, at 15°C. Estimates of the apparent t(1/2)e over both temperatures ranged from 29.5 h (18.4–73.4) to 56.3 h (38.3–106.6). Bioavailability averaged 42% over all doses at 15°C and was decreased to an average of 25% at 10°C. Peak serum concentrations appeared between 6 and 8 h following dosing. A dose of 5 mg/kg/ day was estimated to provide average steady-state serum concentrations at 10°C that are approximately 4.5 times the highest reported MIC values for Streptococcus spp., the fish pathogen least sensitive to enrofloxacin. Owing to the long apparent half-life of elimination of enrofloxacin in fingerling trout, it would take approximately 5 to 9 days to achieve these predicted steady-state serum concentrations; this estimate is important when considering the duration of therapy in clinical trials." @default.
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- W2092126139 date "1992-03-01" @default.
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- W2092126139 title "Pharmacokinetics of enrofloxacin in fingerling rainbow trout (Oncorhynchus mykiss)" @default.
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- W2092126139 doi "https://doi.org/10.1111/j.1365-2885.1992.tb00987.x" @default.
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