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• W51219653 abstract "The macrolide antibiotic clarithromycin (CLARI) has a wide spectrum of activity and efficacy for Mycoplasma species. In addition, CLARI accumulates during re-dosing of Mojave desert tortoises (Gopherus agassizii). Here, we characterized plasma concentrations after a single dose, after 3.5 months of dosing, and after per rectum administration; all doses were 15 mg/kg. After a single dose, the median maximal plasma concentration (Cmax) was 1.69 mg/ml and occurred at a median of 6 h after administration, the estimated elimination half-life was 6.9 h, and the median accumulation index was 10%. Plasma concentrations after long-term dosing showed consistent intraturtle concentrations of at least 2 microg/ml, with 1 turtle showing increasing accumulation of CLARI at all 3 time points and the remaining 5 turtles showing increases by 3.5 mo. Compared with expected Cmax values, the median long-term values were approximately 3 times higher than expected in 4 of 6 turtles and approximately 2/3 of that expected in the remaining 2 turtles. Per rectum dosing caused antibiotic retention below target values. Together, these results support accumulation of CLARI after repeated oral dosing and indicate that stable concentrations are reached long-term. Either cystoenteric recycling of CLARI or large intestinal absorption of bypass CLARI may explain the observed cumulative increases. In addition, twice-weekly CLARI maintains target concentrations over time, and per rectum dosing will require higher doses or increased dose frequency to be successful. Based on this work, pharmacokinetic studies in exotic species should include multidose studies to verify initial kinetic estimates from single-dose trends." @default.
• W51219653 created "2016-06-24" @default.
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• W51219653 date "2008-07-01" @default.
• W51219653 modified "2023-09-23" @default.
• W51219653 title "Long-term and per rectum disposition of Clarithromycin in the desert tortoise (Gopherus agassizii)." @default.
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