Cardiology doctors in Kodigehalli Aspirin and clopidogrel resistance Aspirin resistance and clopidogrel resistance are currently under investigation as a cause of thrombotic events in patients on treatment. There is no clear definition of aspirin and clopidogrel resistance at the moment and as yet little evidence is available to suggest appropriate management. Tests of platelet function are not yet reliable enough for routine clinical use. Dipyridamole (Persantin) has relatively poor anti-thrombotic activity and can cause a coronary artery steal phenomenon. It is not recommended for patients with angina. Anticoagulation Warfarin is rarely indicated for patients with stable angina unless they are in atrial fibrillation