- Patients who are currently receiving anticoagulation treatment with therapeutic doses of warfarin or equivalent anticoagulants (e.g., coumadin, rivaroxaban, apixaban, dabigatran) or receive antiplatelet agents (e.g., high dose aspirin or clopidogrel or other) or have an INR >1.5. Treatment with acetylsalicyclic acid 100 mg daily or prophylactic use of low molecular weight heparin (LMWH) is allowed.