Warfarin (Coumadin)

Photograph of Warfarin
 under the microscope.

Warfarin is an anticoagulant (blood thinner) that is used to prevent blood clots and to reduce the risk of death, another heart attack, or a stroke after a heart attack. The drug acts by inhibiting the synthesis of vitamin K-dependent coagulation factors. One of the most important risks when using warfarin is serious blood loss due to hemorrhage. Side effects include hemorrhage, chest pain, difficult breathing, dizziness, headache, and shortness of breath.

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