Old thrombus is very difficult to dissolve through drugs, if the condition requires, you can implant a stent to open the narrowed or occluded blood vessels, some of the existence of old thrombus does not have a serious impact, do not need to deliberately dissolve, usually pay attention to the use of medication to prevent the formation of new thrombus can be. 1. Old thrombus, generally refers to the formation of more than two weeks of thrombus, this kind of thrombus is difficult to dissolve through the thrombolytic drugs to dissolve open, if it affects the blood supply of the blood vessels can be implanted stents to open the narrowed or occluded blood vessels, do not need to dissolve the thrombus. 2. Old thrombus due to most of the water absorption, so the possibility of thrombus dislodgement is also very small, if it does not cause serious vascular stenosis, clinical symptoms are also mild, usually follow the doctor’s instructions to adhere to the application of antiplatelet aggregation, lipid-lowering stabilization of plaque and other medications, to prevent thrombus increase or new thrombus can be. Often choose drugs such as aspirin, clopidogrel, atorvastatin and so on. For the treatment of old blood clots, you need to go to the hospital, the doctor according to the situation to develop a reasonable treatment program.