Vitamin C tablets should not be taken in excess, too much may cause adverse reactions such as scurvy and diarrhea after stopping the drug. Vitamin C tablets (100mg/tablet) are chewed and swallowed, and the usual dosage for adults is 1 to 2 tablets at a time, 3 times a day. Vitamin C tablets should not be taken too much, because long-term use of vitamin C tablets may cause withdrawal reactions, and patients may develop post-discontinuation scurvy. If patients take vitamin C tablets for a long time, they should follow the doctor’s instructions to gradually reduce the amount of discontinuation. Patients taking large amounts of vitamin C tablets for a long period of time may also cause urate, cysteinate or oxalate stones, etc. Overdose of vitamin C tablets may also cause diarrhea, red and bright skin, headache, frequent urination and other adverse reactions. Vitamin C tablets are used for the prevention of scurvy, and can also be used in a variety of acute and chronic infectious diseases and purpura and other adjuvant therapy, but allergic to vitamin C tablets are prohibited to prevent the occurrence of systemic rash, itchy skin, respiratory difficulties and other allergic symptoms. Vitamin C tablets can not be eaten more, it is recommended that patients take medication under the guidance of a doctor, should not be self-medication.