Title : Rate of onset of inhibition of gut-wall and hepatic CYP3A by clarithromycin.

Pub. Date : 2013 Mar

PMID : 22777148






7 Functional Relationships(s)
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1 Rate of onset of inhibition of gut-wall and hepatic CYP3A by clarithromycin. Clarithromycin cytochrome P450 family 3 subfamily A member 4 Homo sapiens
2 AIMS: To determine the extent and time-course of hepatic and intestinal cytochrome P450 3A (CYP3A) inactivation due to the mechanism-based inhibitor clarithromycin. Clarithromycin cytochrome P450 family 3 subfamily A member 4 Homo sapiens
3 AIMS: To determine the extent and time-course of hepatic and intestinal cytochrome P450 3A (CYP3A) inactivation due to the mechanism-based inhibitor clarithromycin. Clarithromycin cytochrome P450 family 3 subfamily A member 4 Homo sapiens
4 RESULTS: Intestinal CYP3A activity decreased by 64 % (p = 0.0029) following the first dose of clarithromycin, but hepatic CYP3A activity did not significantly decrease. Clarithromycin cytochrome P450 family 3 subfamily A member 4 Homo sapiens
5 Repeated dosing of clarithromycin caused a significant decrease in hepatic CYP3A activity (p = 0.005), while intestinal activity showed little further decline. Clarithromycin cytochrome P450 family 3 subfamily A member 4 Homo sapiens
6 CONCLUSIONS: Following the administration of clarithromycin, the onset of hepatic CYP3A inactivation is delayed compared to that of intestinal CYP3A. Clarithromycin cytochrome P450 family 3 subfamily A member 4 Homo sapiens
7 The time-course of drug-drug interactions due to clarithromycin will vary with the relative contribution of intestinal and hepatic CYP3A to the clearance and bioavailability of a victim substrate. Clarithromycin cytochrome P450 family 3 subfamily A member 4 Homo sapiens