Antithrombotic drugs include two major categories: 1. antiplatelet drugs; 2. anticoagulants: that is, drugs that release platelet aggregation, such as heparin, etc., which are mainly used in patients with cardiovascular and cerebrovascular diseases. Patients with coronary artery disease and atrial fibrillation may need to take anticoagulants; they also need to take anticoagulants after replacing heart valves; if carotid ultrasound indicates plaque formation and reaches a certain thickness, anticoagulants are recommended; there are also patients who have stents placed and bypass surgery, the application of anticoagulants is also recommended. The duration of antithrombotic drug application is closely related to the severity of the disease and the time after stent placement and coronary artery bypass surgery. The length of treatment and dose changes require consultation with a specialist in cardiology, cardiac surgery or neurology.