Coagulants are drugs that have a therapeutic effect on the coagulation function of the human body. Clinically, there are two major categories of coagulants: first, drugs that promote coagulation, and also drugs that are often used for the treatment of various bleeding disorders. Coagulation-promoting drugs are commonly used clinically, such as hemostatin, aminohexanoic acid, tranexamic acid, etc. Through different mechanisms of action, these drugs can improve the coagulation function of the human body and are often used in the treatment of various bleeding disorders, such as vitamin K deficiency, disseminated intravascular coagulation and other diseases. Second, anticoagulants, applied in the prevention and treatment of various thrombotic diseases. Anticoagulants commonly used include aspirin, heparin, warfarin, etc. These drugs are also used to treat and prevent thrombotic diseases through different mechanisms of action, such as aspirin is often used in the prevention of coronary heart disease and cerebral thrombosis, warfarin is often used in the prevention of thrombotic diseases after heart valve surgery, in addition, heparin is often used in the treatment of venous thrombosis of the lower limbs after formation.