Codeine is an analgesic drug, commonly used as codeine phosphate tablets, which is mainly used in the treatment of pain in tumor patients and also has a central cough suppressant effect, especially in advanced stages of malignant tumors with significant pain. In addition, for tumors of the lung tissue, if the mediastinal lymph nodes or hilar lymph nodes are enlarged, the compression of the trachea will cause an irritating cough, and oral codeine phosphate tablets also have a significant cough suppressant effect. For oral diseases, gingivitis or after surgery, oral codeine tablets can also be used for pain relief. For common bone fracture surgery of the extremities and non-gastrointestinal surgery, they can be treated with oral pain medication. For patients with chronic diseases, oral codeine tablets can easily lead to addiction if taken for a long time. There is also the fact that prolonged use of the drug can also easily lead to abnormal liver or kidney function.