Generic name of Icosin is Vitamin AD Drops, which is usually taken until about 2~3 years old, and can be extended if needed. Under normal circumstances, vitamin AD drops can be taken until the age of 2~3 years old. Vitamin AD drops mainly contain vitamin A and vitamin D, which can promote the development of eyesight and retinal development, and also can effectively prevent night blindness. Vitamin D can promote calcium absorption. If your child suffers from bone aches and pains and delayed physical development due to calcium deficiency, it can be relieved by taking vitamin AD drops orally. If the calcium deficiency is more serious, vitamin AD drops need to be taken for a longer period of time, and it is generally recommended to take them until about 3~4 years old. Regular checkups are needed during the course of medication, and discontinue use when there is sufficient calcium in the body and no deficiency of vitamin D or vitamin A. If the child has picky eating, partiality, abnormal physical development and other conditions, you can take vitamin AD drops under the guidance of the doctor.