The purpose of precautionary medication before surgery is to prevent some of the risks that may occur during surgery, so that the surgery is safer, the patient recovers more quickly after surgery, and complications are reduced. For example, if a patient has coagulation disorders, preoperative medications such as thrombin or vitamin K1 should be given to promote the formation of coagulation factors to ensure normal blood clotting and prevent more intense bleeding during intraoperative trauma. Alternatively, when the patient’s blood pressure is high before surgery, it should be actively controlled before surgery to lower the systolic blood pressure to at least 180 mmHg or less and the diastolic blood pressure to 100 mmHg or less to ensure a certain level of safety. In addition, thiourea drugs combined with iodine should be applied before thyroidectomy to reduce the blood flow to the thyroid gland and the normal function of the endocrine glands, which can reduce some of the risks during thyroidectomy. formation.