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Department of Clinical Pharmacology, Jinling Hospital, Nanjing 210002, China. guokaku@hotmail.com
Furanocoumarins (psoralens) exist in various plants and some of them are used to cure skin diseases. These chemicals draw attentions recently because of their abilities to arouse drug interaction through inhibition of cytochrome P450. Grapefruit juice is a well-known example for food-drug interaction. But in vitro and in vivo studies have shown that the causative components are mainly furanocoumarin derivatives with geranyloxy side chains. In vitro experiments confirmed that furanocoumarins from grapefruit juice are both competitive and mechanism-based inhibitors of CYP3A4. Although the inhibition appeared to be stronger in the dimers than that in the monomers, all contribute comprehensively to the grapefruit juice-drug interaction. Further experiments with other furanocoumarins and related citrus fruits or umbelliferous herbal medicines indicate that drug interaction might also occur with stuffs other than grapefruit juice, especially with traditional medicine.
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