Lorazepam is a typical benzodiazepine sleeping drug, side effects from three aspects, first, the most common, if a small amount of lorazepam is taken, some patients will be dizzy and mental bad on the 2nd day. Second, with the patient’s dose and sensitivity to the drug, if the patient is very sensitive to the drug or take a very large dose, it can cause the patient to remain drowsy or even life-threatening on the second day. Third, for patients with respiratory diseases, especially patients whose breathing would have been bad must pay attention, if the respiratory tract has diseases, taking such drugs as lorazepam, must be taken under the guidance of a doctor, it may cause respiratory depression, serious consequences.