Whether or not vitamin AD and vitamin D3 can be taken together depends on the level of vitamin deficiency in the body, and the type of deficiency. It is recommended to consult your doctor, and professional advice should prevail. Vitamin AD contains vitamin A and vitamin D. It is mostly used for the prevention and treatment of vitamin A and vitamin D deficiency, while vitamin D3 is mainly used for the prevention and treatment of vitamin D deficiency. Both vitamin A and vitamin D are fat-soluble vitamins, and excessive intake has the risk of toxicity. Diseases related to vitamin A or vitamin D deficiency, such as night blindness, rickets, hand-foot convulsions, etc., are only for prevention purposes, when it is sufficient to choose one of vitamin AD or vitamin D3 for supplementation according to the specific situation, and there is generally no need to take them at the same time. In the case where two drugs can be taken together, it is common for patients with night blindness, rickets, hand-foot convulsions, etc. to take two or more vitamins at the same time as prescribed by the doctor, if only one vitamin cannot meet the treatment needs. In addition, it is recommended that vitamins be taken under the guidance of a professional doctor or pharmacist and in strict accordance with the prescribed dose, do not increase or decrease the dose on your own to avoid dizziness, headache, drowsiness, itchy skin and other toxic reactions, and pay attention to your own reactions while taking them and inform your doctor in a timely manner of any abnormalities.