warfarin
Poison that induces fatal internal bleeding in rats; neutralized with sodium hydroxide, it is used in medicine as an anticoagulant in the treatment of thrombosis: it prevents blood clotting by inhibiting the action of vitamin K. It can be taken orally and begins to act several days after the initial dose.
Warfarin is a crystalline powder, C19H16O4. Heparin may be given in treatment at the same time and discontinued when warfarin takes effect. It is often given as a preventive measure, to reduce the risk of thrombosis or embolism after major surgery.
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