It has been found that small amounts of grapefruit should have little effect on warfarin. Studies showed that warfarin patients showed no effect when they had up to three glasses (24 ounces) of grapefruit juice daily. Although, some case reports show increased INR associated with 50 ounces of grapefruit juice daily. Still, warfarin patients should be cautious with their grapefruit consumption and other medications they may take. If you regularly enjoy grapefruit or grapefruit juice, speak with your physician about how it may interact with warfarin and other medications you take.
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