Warfarin is a blood thinner that prevents and treats blood clots. It can also lower your risk of a stroke if you have AFib or heart valve replacement. Warfarin as a drug is marketed under many brand and generic names, including Aldocumar, Anasmol, Anticoag, Befarin, Cavamed, Cicoxil, Circuvit, Cofarin, Coumadin, Coumadine, Cumar, Farin, Foley, Haemofarin, Jantoven, Kovar, Lawarin, Maforan, Marevan, Marfarin, Marivanil, Martefarin, Morfarin, Orfarin, Panwarfin, Scheme, Simarc, Varfarin. NHS information about the medicine warfarin, including what it's used for, who can use it, how to use it and side effects. Warfarin is an anticoagulant used to prevent heart attacks, strokes, and blood clots. Learn about side effects, interactions and indications. La warfarina se utiliza en el tratamiento y prevención de coágulos sanguíneos y accidentes cerebrovasculares. Vea los usos, efectos secundarios, dosis y precauciones y obtenga asesoramiento de expertos. Warfarin (brand names Coumadin and Jantoven) is a prescription medication used to prevent harmful. La warfarina pertenece a una clase de medicamentos llamados anticoagulantes (diluyentes de la sangre'). Actúa al disminuir la capacidad de coagulación de la sangre.