Vitamin C Injection is mainly composed of vitamin C. It is mainly used for the treatment of scurvy, or various acute and chronic infectious diseases and purpura and other auxiliary treatment. It is also used to treat chronic iron poisoning. Idiopathic methemoglobinemia. As well as due to cancer, surgery, trauma caused by malnutrition, pregnancy and lactation caused by vitamin C deficiency. The therapeutic scope does not include the treatment of itchy throat and cough. Common side effects of vitamin C injections include the occasional development of urate, cysteinate or oxalate stones after prolonged use. Improper discontinuation of the drug can lead to scurvy and so on. Therefore, vitamin C injection injection and stop using need to strictly follow the doctor’s instructions. In case of serious adverse reactions, immediate medical attention should be sought. People who are allergic to vitamin C are forbidden to use it, and pregnant and lactating women should use it with caution. Itchy throat, cough, mainly occurs in allergic pharyngolaryngitis, reflux pharyngolaryngitis, etc. Vitamin C injection has no therapeutic effect on it. Itchy throat and cough, it is recommended to consult a doctor in time and follow the doctor’s instructions to standardize the treatment.