Tegeo side effects are as follows: 1st, bone marrow suppression and hemolytic anemia can occur. Patients present with fever, sore throat, leukopenia, and thrombocytopenia. If these adverse reactions occur, the drug should be discontinued and treated symptomatically. No. 2, it can lead to severe diarrhea and then dehydration in patients. If these adverse reactions occur, the drug should be discontinued and treatment with rehydration should be taken. No. 3, interstitial pneumonia may occur, in which patients exhibit cough, shortness of breath, dyspnea, and fever. No. 4, it may lead to peptic ulcers, gastrointestinal bleeding or perforation of the gastrointestinal tract in patients.