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[[File:Coumadin (Warfarin).jpg|350px|thumb|rightleft|''"It's a good thing I'm on Coumadin..."'']]
'''Coumadin''' (generic '''warfarin''') is an anticoagulant once used to poison rodents that is now used instead to poison humans.<ref>[http://gomerblog.com/2016/04/16620/ Study: Anticoagulation Initiation Instantly Increases Your Fall Risk]</ref>