Cranberry juice can potentiate the anticoagulant effects of warfarin, potentially increasing the risk of bleeding.
Avoid large quantities (>250 mL/day) of cranberry juice.
Report any signs of bleeding (e.g., blood in urine/stool) immediately.
Consistent vitamin K intake from diet helps stabilize INR.
Interaction is more pronounced in those with low warfarin doses or genetic variations in CYP2C9.
Cranberry juice contains flavonoids that inhibit CYP2C9, a key enzyme in the metabolism of warfarin's more potent S-enantiomer, leading to elevated warfarin plasma levels and prolonged anticoagulant activity. It may also displace warfarin from plasma protein binding sites.
Elevated INR levels, increased risk of hemorrhage, gastrointestinal bleeding, bruising, or epistaxis, particularly with high consumption (e.g., more than 1 liter daily).
Limit cranberry juice intake to small amounts; monitor INR frequently (e.g., weekly) if consumed. Consult a healthcare provider for individualized advice and potential warfarin dose adjustments.
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