Warfarin is a commonly-used blood thinner (‘anticoagulant’) that works by reducing the blood’s ability to form clots. It’s used to stop clots forming in common places like the deep veins of the legs or in some heart conditions where clot formation is more likely. Once a clot has formed Warfarin can’t break it down but it can stop it getting bigger. People on long term warfarin need regular blood tests to keep the dose at the right level.

Common associated names: Coumadin, Jantoven

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