The efficacy of Tegafur Injection is to interfere with and block the synthesis of DNA (deoxyribonucleic acid), RNA (ribonucleic acid) and protein, and the effect is anti-tumor. Tegafur Injection is a derivative of fluorouracil, which can be converted into fluorouracil in the body, thus exerting the above effects and functions, and is mostly used in the treatment of digestive tract tumors such as gastric cancer, pancreatic cancer, hepatocellular carcinoma, rectal cancer, as well as breast cancer. It should be noted that the use of Tegafur injection is forbidden for those who are allergic to any components of this drug, pregnant women, nursing mothers, and some patients may experience adverse reactions such as headache, dizziness, ataxia, platelet drop, nausea, vomiting, itching, phlebitis, pain at the injection site, etc., and it is recommended to inform the doctor in time and take appropriate treatment. Tegafur injection should be used by professional doctors, patients should not use the drug on their own to avoid inducing side effects or affecting the condition.