After vitamin AD poisoning, patients often experience dizziness, nausea, vomiting, diarrhea, constipation, and even some patients may experience fever, itchy skin, dry lips, general weakness, and bone and joint pain. If the recommended dose is taken, adverse reactions rarely occur, but long-term or overdose can lead to vitamin AD toxicity. When a patient develops vitamin AD toxicity, he or she must pay high attention to it and consult a regular hospital as soon as possible for the next step of treatment under the guidance of a specialist. Vitamin AD is mainly used for patients with vitamin AD deficiency, such as night blindness, dry eye, rickets, and chondromalacia.