Does green tea extract affect the way warfarin works?

Warfarin is a medication that is used to prevent blood clots. It works by interfering with the body's ability to form clots.

Green tea extract is a supplement that is made from the leaves of the green tea plant. It contains a number of compounds that have antioxidant and anti-inflammatory properties.

Some studies have shown that green tea extract may interfere with the absorption of warfarin, which could lead to a decrease in the effectiveness of the medication. Other studies have not found this effect.

If you are taking warfarin, talk to your doctor before you start taking green tea extract. Your doctor may want to monitor your blood clotting time to make sure that the green tea extract is not affecting the effectiveness of the warfarin.