Capecitabine is commonly used in clinical dosage form as tablets, and the instructions recommend swallowing the drug whole with water within 30 minutes after a meal at 1250mg/m2 twice daily, and the specific dosage should be followed by a doctor’s advice. Capecitabine tablets instructions recommend single drug dosage of 1250mg/m2, twice a day, 3 weeks for a course of treatment, of which 2 weeks of treatment and then stop for 1 week, the drug should be swallowed whole with water within 30 minutes after a meal, and should not be crushed or cut. Due to different patients with different combination of drugs, general conditions and other factors, the specific dosage can not be generalized, patients should follow the doctor’s instructions for use of the drug. This drug is a kind of antineoplastic drug, which can be used for adjuvant chemotherapy of colon cancer, single-agent chemotherapy of breast cancer, and first-line treatment of inoperable advanced or metastatic gastric cancer. It should be noted that the use of this drug is prohibited for those who are allergic to any of the components of this drug and fluoropyrimidine, those who have a history of serious adverse reactions to fluoropyrimidine, those who have a complete lack of dihydropyrimidine dehydrogenase activity, and those who have severe renal impairment, and this drug should not be used concurrently with sorivudine or its analogs. Some patients may experience abdominal pain, diarrhea, vomiting, nausea, anorexia, stomatitis, dermatitis, hand-foot syndrome, fatigue and other adverse reactions after using the drug. If any of the above symptoms occur after taking the drug and continue to be unrelieved or if the symptoms are more serious, they should consult a doctor in time. Patients should follow the doctor’s instructions to take the drug, not to increase or decrease the dose or blindly stop taking the drug, so as not to affect the therapeutic effect of the drug.