Warfarin is an oral anticoagulant widely used for primary and secondary prevention of thromboembolism that belongs to the class of vitamin K antagonists., In Brazil, warfarin is still the main oral anticoagulant distributed free of charge by the Unified Health System. According to the Institute for Safe Practices in the Use of Medicines (ISMP – Brazil), warfarin is classified as a high-alert or potentially dangerous drug since it has a low therapeutic index and its use requires constant attention for […]