The purpose of using drugs before anesthesia is common for the following: 1, sedation: due to the patient’s nervousness and anxiety, he or she may not sleep well the day before surgery, and may be more tired and sleepy on the day of surgery, and may even have increased blood pressure. So patients can apply Valium drugs and so on the day before anesthesia, so that they can rest better; 2, analgesia: before injecting anesthetics to patients, analgesic drugs can be used, which can well relieve the pain that occurs during the induction period of anesthesia, so as to avoid tension and anxiety due to pain and increase anesthetic complications; 3, reduce secretions: for example, scopolamine, which is suitable for patients under general anesthesia, can reduce the respiratory tract secretion of mucus to avoid affecting the effect of anesthesia, thus avoiding secretions from entering the lungs and causing pulmonary obstruction and inflammation. In addition, it can also avoid the patient’s sputum to obstruct the tracheal intubation tube, so as not to reduce the function and effect of tracheal intubation.