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Passiflora incarnata
Moderate· limited-evidence
May be possible under supervision — talk to your prescriber or pharmacist before combining.
Passionflower contains coumarin derivatives that may enhance warfarin's anticoagulant effect.
Coumarin constituents may have additive anticoagulant activity with warfarin.
Source: Natural Medicines Database · Reviewed April 2026
Passionflower + Warfarin (Coumadin): use caution. May be possible under supervision — talk to your prescriber or pharmacist before combining. Passionflower contains coumarin derivatives that may enhance warfarin's anticoagulant effect.
Coumarin constituents may have additive anticoagulant activity with warfarin.
Do not stop either abruptly on your own. Talk to your prescriber or pharmacist promptly — bring this page to your appointment.
Educational information only — not medical advice. Always verify with a healthcare professional.