Aspirin preparations are not able to dissolve blood clots. The role of aspirin preparations is to prevent the formation of blood clots by resisting the aggregation of platelets, but the anti-thrombotic effect of aspirin preparations is relatively low compared to anticoagulants. If anticoagulant drugs can be used to prevent thrombosis or to treat thrombosis, they have a positive effect on the prevention and treatment of thrombosis. If anticoagulant drugs cannot be applied, aspirin preparations can be applied to prevent thrombosis, but the effect of preventing thrombosis is not as good as that of anticoagulant drugs. So for aspirin preparation, it is used as an antipyretic and analgesic and anti-platelet aggregation drug, but it is not able to dissolve thrombus. For the treatment of thrombosis, anticoagulant drugs are mainly used.