Possible Interaction Between Cranberry Juice and Drug Warfarin

The British Medicines and Healthcare products Regulatory Agency (MHRA) reported five cases that suggest a food-drug interaction between cranberry juice and warfarin that could cause internal hemorrhage.

One of these cases involved a man who suffered a fatal internal hemorrhage. His blood clotting levels increased dramatically six weeks after starting to drink cranberry juice.

In another case, blood clotting levels increased less dramatically but returned to the normal range after cranberry juice was discontinued.

Many women drink cranberry juice to prevent bladder infections.

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