Problem: The nurse is preparing to administer an anticoagulant. Group the correct information with the correct drug. Some options may be used more than once. Warfarin [Coumadin] Heparin therapeutic monitoring is evaluated by an INR and an INR of 2 to 3 is appropriate for most patients significant bleeding risk, monitor patients closely for signs of blood loss suppresses coagulation by helping antithrombin inactivate clotting factors, primarily thrombin and factor Xa overdose can be overcome with vitamin K1 (phytonadione)