Angong Niuhuang Pill can not prevent the occurrence of cerebral thrombosis, Angong Niuhuang Pill is a proprietary Chinese medicine, which mainly has the effect of clearing away heat and detoxification, and suppressing fright and opening up the mind. It is clinically used for the treatment of stroke, coma or encephalitis, meningitis, cerebral hemorrhage, toxic encephalopathy, as well as cerebral thrombosis diseases resulting in patients with high fever and convulsions, fainting, delirium and other symptoms, and is not used for the prevention of cerebral thrombosis. The formation of cerebral thrombosis is related to atherosclerosis of the arteries in the brain, or the shedding of heart emboli. Therefore, to prevent cerebral thrombosis, we should prevent cerebral atherosclerosis, and regulate and prevent the risk factors that cause it. If the patient has had a cerebral infarction, the patient should start the secondary prevention drug of cerebrovascular disease, orally take aspirin to prevent platelet aggregation and thrombosis, or orally take warfarin or rivaroxaban to anticoagulate and prevent cardiac embolus dislodgement. If the patient has no previous cerebral thrombosis there is no need to take the above drugs orally, but the primary prevention should be done for diabetes mellitus, hypertension, hyperlipidemia and other diseases.