Vitamin C is a vitamin drug, the elderly eating vitamin C precautions are to clarify the drug contraindications, dosage, adverse reactions and so on. 1. Contraindications: allergic to vitamin C to prohibit the use of the elderly, suffering from gout, diabetes, urate kidney stones, thalassemia in the elderly under the guidance of a doctor to use caution. 2. Dosage: strictly in accordance with the doctor’s instructions, do not take too much, for long-term use of vitamin C in the elderly can not be suddenly stopped, to gradually reduce the amount of drugs to stop. 3. Adverse reactions: long-term use of vitamin C can cause urate stones, overdose will appear diarrhea, nausea, vomiting and other adverse symptoms. The elderly in taking vitamin C, must let the elderly clear the above precautions, adverse reactions need to go to the hospital in a timely manner for treatment.