Vitamin AD drops are generally recommended for infants a few days after birth. Vitamin AD drops are preventive against rickets, night blindness, and pediatric hand and foot twitching. They are effective in helping infants absorb calcium and are generally recommended for infants a few days after birth. Long-term overdose of vitamin AD drops can produce chronic poisoning. Early on, there can be bone and joint pain, swelling, itchy skin, dry and cracked lips, fever, headache, vomiting, constipation, diarrhea, nausea and other adverse reactions. This drug should be contraindicated in infants with renal failure, hypercalcemia, rickets, or in infants with vitamin A sensitivity. Vitamin AD drops have adverse reactions, it is recommended to use the drug under the guidance of a doctor, not blindly self-medication, in order to avoid adverse effects.