MAJOR — Use With Caution
🔴 CAUTION — Major interaction between Ginkgo Biloba and Warfarin. Avoid unless under direct medical supervision.
Evidence level: STRONG
Ginkgo thins blood. Warfarin thins blood. Together, bleeding risk is dangerous — including internal bleeding and hemorrhagic stroke.
Ginkgo inhibits platelet-activating factor (PAF). Combined with warfarin, bleeding risk increases significantly.
When combining Ginkgo Biloba with Warfarin, tell your doctor before any surgery or dental procedure. Watch for unusual bruising, bleeding gums, blood in stool, or prolonged bleeding from cuts.
Use caution. Many botanicals affect blood clotting — ginkgo, garlic, ginger, turmeric, and dong quai all have antiplatelet activity that can amplify Warfarin. St. John's Wort can REDUCE anticoagulant effectiveness. Take at separate times and inform your prescriber about all herbal supplements. Request more frequent INR monitoring if on warfarin.
Higher risk with: older age (65+), history of GI bleeding, concurrent use of multiple blood-thinning agents, liver disease, heavy alcohol use, recent surgery.
Unusual bruising, bleeding gums, nosebleeds, blood in urine or stool, black tarry stools, prolonged bleeding from cuts, coughing up blood.
Ask your doctor: "Is there a safer alternative to Ginkgo Biloba that I can take with Warfarin?" Bring a list of ALL supplements and medications you take.
Blood thinners have narrow safety margins. Instead of Ginkgo Biloba, consider safer options: CoQ10 (with INR monitoring), vitamin D3, or probiotics — these have minimal anticoagulant interactions. Always inform your anticoagulation clinic about any supplements.
Ginkgo thins blood. Warfarin thins blood. Together, bleeding risk is dangerous — including internal bleeding and hemorrhagic stroke.
Use caution. Many botanicals affect blood clotting — ginkgo, garlic, ginger, turmeric, and dong quai all have antiplatelet activity that can amplify Warfarin. St. John's Wort can REDUCE anticoagulant effectiveness. Take at separate times and inform your prescriber about all herbal supplements. Request more frequent INR monitoring if on warfarin.
Unusual bruising, bleeding gums, nosebleeds, blood in urine or stool, black tarry stools, prolonged bleeding from cuts, coughing up blood.
Blood thinners have narrow safety margins. Instead of Ginkgo Biloba, consider safer options: CoQ10 (with INR monitoring), vitamin D3, or probiotics — these have minimal anticoagulant interactions. Always inform your anticoagulation clinic about any supplements.
Ask your doctor: "Is there a safer alternative to Ginkgo Biloba that I can take with Warfarin?" Bring a list of ALL supplements and medications you take.
Or browse the full interaction database (121,000+ pairs).