Vitamin AD softgels are taken orally 1 capsule at a time, 3-4 times a day for adults, 1 time a day for infants and young children or as directed by a doctor. Vitamin D₃ drops are administered as 1-2 drops per day (each drop contains 300 IU of vitamin D₃) to infants and children, and may be increased to 2-3 drops for pregnant women and lactating mothers. Adults adjust the dose as appropriate. The specific usage needs to be decided specifically according to different situations, and the two should not be taken at the same time to avoid overdose. Vitamin AD softgels are used for the treatment of rickets and night blindness, pediatric tetany, prevention and treatment of vitamin A and D deficiencies. Vitamin D₃ Drops are mainly used for the prevention and treatment of nutritional vitamin D₃ deficiency rickets. Vitamin AD softgels are contraindicated in patients with chronic renal failure, hypercalcemia, hyperphosphatemia with renal rickets; vitamin D₃ drops are contraindicated in patients with hypercalcemia, hyperphosphatemia, and renal rickets. In general, due to widespread deficiency of vitamin D in food, then healthy children under two years of age need daily prophylactic supplementation, up to one year of age daily supplementation of 400 units of vitamin D, 1-2 years of age daily supplementation of 600 units of vitamin D. Whether or not to supplement with vitamin A needs to be decided in conjunction with the diet. For people with vitamin A and D deficiencies, it is important to follow your doctor’s advice on how to take the medication and how to take it.