If children take vitamin AD after overdose will cause adverse reactions, because vitamin A and vitamin D are fat-soluble vitamins, if the supplementation is difficult to metabolize by the body, a series of symptoms will occur. First of all, it will be manifested in the digestive tract symptoms, children after vitamin AD overdose will appear abdominal pain, anorexia, and even constipation and other symptoms. Secondly, it will be manifested as abnormalities in the nervous system, and children will suffer from headache, drowsiness, and even vomiting and other symptoms. Children may also suffer from osteomalacia, bone pain and other symptoms. Therefore, after taking vitamin AD overdose, it is necessary to give children timely treatment, such as hemodialysis, or even gastric lavage for children.