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  • Title: Telithromycin pharmacokinetics in rat model of diabetes mellitus induced by alloxan or streptozotocin.
    Author: Lee JH, Lee MG.
    Journal: Pharm Res; 2008 Aug; 25(8):1915-24. PubMed ID: 18478316.
    Abstract:
    PURPOSE: It has been reported that telithromycin is primarily metabolized via hepatic CYP3A1/2 in rats, the expression and/or mRNA level of hepatic CYP3A1/2 increase in rat model of diabetes mellitus induced by alloxan (DMIA) or streptozotocin (DMIS), and intestinal CYP3A1/2 enzyme activity decreases in rat model of DMIS. Thus, the pharmacokinetic changes of telithromycin in both models of diabetes mellitus compared with those in the control rats were evaluated. METHODS: Telithromycin was administered (50 mg/kg) intravenously or orally to both rat models of diabetes and their respective control rats. RESULTS: After intravenous administration of telithromycin to both models of diabetes, the non-renal clearance (CLNR) was significantly faster (32.3 and 53.1% increase for rat models of DMIA and DMIS, respectively) and the AUC was significantly smaller (25.0 and 33.8% decrease, respectively) than those in their respective controls. However, after oral administration of telithromycin, the AUC was comparable to that in their respective controls. CONCLUSIONS: The faster CLNR after intravenous administration was due to increased hepatic CYP3A1/2 in both models of diabetes. The comparable AUC after oral administration was mainly due to decreased intestinal CYP3A1/2 activity. Alloxan and streptozotocin appear to influence some pharmacokinetics of telithromycin in a different fashion.
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