Vitamin AD drops are mainly used to supplement vitamin A and vitamin D. Both vitamin A and vitamin D are two essential vitamins for human growth and development, especially for the development of fetuses, infants and children. It is very important for the integrity of epithelial tissues, vision, reproductive organs, and the constancy of blood calcium and phosphorus, as well as the growth and development of skeletal muscles and teeth. Vitamin AD drops are mainly used for the prevention and treatment of vitamin A and D deficiencies, such as rickets, night blindness, and pediatric hand and foot tics. Vitamin AD drops must be taken in accordance with medical advice, and it is recommended that they be taken in the recommended dose, not in excess, as long-term overdose is likely to produce chronic toxic reactions. In conclusion, vitamin AD drops are used to supplement vitamin A and vitamin D. They are mainly used to prevent and treat deficiencies of these two vitamins.