The journal of the Royal Society for the Promotion of Health 2008-Nov
Fatal haemopericardium and gastrointestinal haemorrhage due to possible interaction of cranberry juice with warfarin.
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Abstract
We report a case of fatal internal haemorrhage in an elderly man who consumed only cranberry juice for two weeks while maintaining his usual dosage of warfarin. We propose that naturally occurring compounds such as flavonoids, which are present in fruit juices, may increase the potency of warfarin by competing for the enzymes that normally inactivate warfarin. While traditionally regarded as foodstuffs, consumption of fruit juices should be considered when patients develop adverse drug reactions.