The main danger of Iconocin vitamin AD drops is that it may cause vitamin A poisoning, which mostly occurs in infants and children after 6 months of age. Since vitamin D deficiency requires additional supplementation, some parents take extra doses of Iconocin, so it can easily cause vitamin A poisoning. According to its clinical manifestations, it can be divided into acute poisoning and chronic poisoning. The symptoms of acute poisoning appear 6-8 hours after intake, mainly drowsiness or irritability, headache, vomiting and other symptoms of increased intracranial pressure. 12-20 hours later, the skin becomes red and swollen, followed by peeling, and returns to normal after a few weeks, and the main clinical features are increased intracranial pressure in infants and children. The clinical manifestations of chronic poisoning are diverse and not easily noticed in the early stage, and its severity is not related to the dose. The general symptoms are loss of appetite, irritability and irritability, and there can be hypothermia and digestive disorders.