Journal
NEPHROLOGY
Volume 13, Issue 4, Pages 337-347Publisher
WILEY
DOI: 10.1111/j.1440-1797.2008.00940.x
Keywords
cytochrome P450 enzyme; herbal tea; herb-drug interaction; medicinal herb; transplantation; transport proteins
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Aim: To survey the evidence for plant-products to modify cytochrome P450 enzyme, and transport protein mediated drug metabolism in renal transplant patients. Methods: A literature search was performed to identify in vitro and in vivo research on plant-products that might cause overdosage or loss of efficacy of immunosuppressive drugs in transplant patients by the interaction mechanisms already characterized for grapefruit juice and St. John's Wort. Results: The interaction mechanisms of St. John's Wort by pregnane X-receptor mediated upregulation of cytochrome-P450 enzyme 3A4 and p-glycoprotein expression and of grapefruit juice by mechanism-based inhibition of intestinal CYP3A4 suggest that many other plant products will likewise cause interactions with drugs because they occupy the same metabolic pathways. The respective research on foods, spices and medicinal herbs is listed in a comprehensive table and weighted according to its strength of evidence to cause clinically relevant interactions. Conclusion: Physicians supervising drug-regimes in renal transplant patients should be aware of plant products beyond SJW and GFJ to possibly cause overdosage or failure of drug-treatments by herb-drug interactions.
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