Warfarin is an anticoagulant drug often used to treat and prevent blood clots caused by various conditions. It comes in tablet form, is available by prescription only, and is typically taken once a day. The medication works to inhibit blood clotting by decreasing the formation of certain active clotting factors. Potential side effects include easy bruising, hair loss, and purple-colored toes.

What Is Warfarin?

Warfarin sodium (Coumadin®, Jantoven®) is a prescription anticoagulant, often described as a "blood thinner" (although it does not actually thin the blood). It is used to prevent and treat blood clots due to various causes.
(Click What Is Warfarin Used For? for more information, including possible off-label uses.)

Potential Side Effects

Just like any medicine, warfarin can cause side effects, which can be quite dangerous. The risk of most dangerous side effects can be reduced by careful monitoring.
Possible warfarin side effects include but are not limited to:
  • Bleeding, including dangerous internal bleeding
  • Easy bruising
  • "Purple toe syndrome"
  • Hair loss.
(Click Side Effects of Warfarin to learn more, including potentially serious side effects you should report immediately to your healthcare provider.)
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Warfarin Sodium Drug Information

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