Vitamin A is divided into vitamin AD softgels, vitamin AD drops and vitamin A softgels, and how many times a day to take according to different dosage forms, different specifications, different people vary, about between 1 to 4 times. Vitamin AD softgels, adults take 1 to 2 times a day, children should consult a doctor; Vitamin AD drops once a day; Vitamin A softgels, mild vitamin A deficiency patients take 2 to 3 times a day, patients with severe vitamin A deficiency to start to take 4 times a day, three days later changed to 2 times a day, after two weeks to take 1 time a day. Vitamin A is a vitamin-like drug. Commonly used dosage forms are capsules and drops. It is mainly used to treat vitamin A deficiencies such as night blindness, dry eye, rough skin, and corneal softening. It should be noted that vitamin AD soft capsules and vitamin AD drops are two kinds of drugs, which are forbidden to be used by patients suffering from chronic renal failure, hypercalcemia and hyperphosphatemia with renal rickets, and should be used with caution in chronic renal failure. And if excessive use of vitamin A, may lead to the emergence of severe headache, vomiting and other toxic phenomena, and even death. It is recommended that patients should use the drug under the guidance of a doctor, the specific dosage should follow the doctor’s instructions, regular medication, do not take medication without authorization, to avoid delaying the condition.