Foods: Grapefruit juice Warfarin

Some chemical exposures may be hepatic enzyme inducers/inhibitors, altering the effects of drugs like warfarin. Some foods such as mono-amines, will cause reactions in patients given MAOIs grapefruit juice may interact with terfenadine and some other drugs. New diseases may cause problems heart failure causing reduced liver blood flow can reduce the metabolism of drugs like warfarin. 

None of these interactions is very well documented, and their clinical relevance is unclear. Note that vitamin K in food commonly interacts with warfarin, and these interactions are discussed in Coumarins and related drugs + Foods Vitamin Kj-rich , p.409. See also cranberry juice , (p.398), enteral and parenteral nutrition , (below), grapefruit juice , (p.411), mango , (p.408) and soya bean products , (p.408). 

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