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dicoumarolAn oral anticoagulant drug now mainly used as a rat poison. Other more readily controllable coumarins, such as WARFARIN, are now used.
a potent anticoagulant that acts by inhibiting the synthesis of vitamin K-dependent clotting factors (prothrombin and factors VII, IX and X) in the liver; used in the prevention and treatment of thromboembolic disorders. Produced naturally by conversion of nontoxic coumarin in moldy sweet clover hay, lespepeza hay or sweet vernal hay. Eating the hay causes blood loss due to spontaneous hemorrhage. Formerly called bishydroxycoumarin. See also melilotus, anthoxanthum odoratum lespedeza.