- Allergy to TXA, acquired disturbances of color vision, refusal of blood products, pre-op use of anticoagulant therapy within five days before surgery, a history of arterial or venous thromboembolic disease (such as DVT, PE, CVA, TIA), pregnancy, breastfeeding, major comorbidities (such as severe ischemic heart disease [New York Heart Association Class III or IV], previous myocardial infarction, severe pulmonary disease, renal impairment, or hepatic failure), patients who decline to participate, any patient undergoing a revision TKA, THA or BHR