The dosage of vitamin C intravenous drip cannot be generalized, but needs specific analysis according to the condition. Vitamin C can be applied to 250ml of glucose injection with vitamin C 2.0g if used for allergic reactions, and 1 time/day intravenous drip can be given. If it is used for some food allergy, drug allergy, or serious allergic reaction, it can be added to 250ml of glucose injection, and vitamin C 3.0g can be given intravenously. In case of poisoning reactions, such as chemical poisoning, food poisoning, drug poisoning, etc., vitamin C 5.0g can be given to 250ml of glucose injection or saline injection for 1 time/day drip.