Vitamin C tablets have the benefit of preventing scurvy and can also be used as an adjunctive treatment for a variety of acute and chronic infectious diseases as well as purpura and other diseases. Vitamin C tablets should not be taken for a long time, and should not be suddenly discontinued because sudden discontinuation of vitamin C tablets can lead to scurvy, in addition, children should not overdose of vitamin C tablets, to prevent leading to bone disease. Long-term use of large amounts of vitamin C tablets can cause urate, cysteinate or oxalate stones, overdose can cause diarrhea, red and bright skin, headache, frequent urination, nausea and vomiting, stomach cramps. It is contraindicated for patients who are allergic to vitamin C components to prevent allergic symptoms such as generalized rash and itchy skin. It is recommended that patients consult a doctor before taking vitamin C tablets, under the guidance of a doctor, should not blindly take vitamin C tablets to avoid nausea, vomiting and other uncomfortable symptoms.