The side effects of Tegeo are mainly as follows: First, myelosuppression, some patients will have reduced white blood cells, thrombocytopenia, hemolytic anemia after applying Tegeo, so the application of Tegeo needs to monitor the blood routine and timely correction; Second, gastrointestinal side effects, some patients will have anorexia, nausea, vomiting, diarrhea, etc. after applying Tegeo, but Tegeo’s nausea, vomiting and other side effects are small, while Some patients will have more serious diarrhea, which needs to be closely monitored, and if there is severe diarrhea, the drug needs to be discontinued; third, cardiotoxicity, fluorouracil drugs have a certain degree of cardiotoxicity, but most patients are better compensated; fourth, mucosal side effects, such as oral mucositis needs to be promptly observed and corrected; fifth, tegeo can occur hand and foot syndrome, such as hand and foot peeling, darkening of skin color, etc.