The reason for lung cancer patients to take codeine phosphate tablets is mainly for cough suppressant treatment. Lung cancer is a malignant tumor, which can cause severe cough, especially severe dry cough. When the coughing symptom is severe, it will affect the patient’s sleep, rest and life, so strong cough suppressant drugs need to be given to relieve it, and codeine phosphate tablets are the most commonly used central cough suppressant drugs in clinical practice. Codeine phosphate tablets are the most commonly used central cough suppressant in clinical practice. This drug can suppress cough by inhibiting the cough center, thus lung cancer patients with severe dry cough can use codeine phosphate for cough suppressant treatment. Codeine phosphate is also an opioid receptor drug, which has certain anesthetic and analgesic effects, so lung cancer patients with pain symptoms also have some relief.