Cranberry × Warfarin

Severity: MODERATE Evidence: possible

Mechanism

Cranberry may inhibit CYP2C9, reducing warfarin metabolism. Evidence is conflicting but cases of increased INR exist.

Effect

Possible increased INR and bleeding risk

Management

Monitor INR with cranberry products. Moderate intake is usually safe.

Source

Greenblatt DJ, von Moltke LL. J Clin Pharmacol 2005; Iseme BA et al. Clin Pharmacol Ther 2007

⚠️ MODERATE INTERACTION: Monitor closely if this combination is used.

Disclaimer

This interaction record is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider before starting or stopping any supplement or medication.