Vitamin D2 Injection can be used for the prevention and treatment of vitamin D deficiency, and can also be used in the treatment of chronic hypocalcemia, rickets and osteochondrosis with chronic renal insufficiency. Vitamin D2 Injection is a vitamin drug that can maintain and regulate the normal concentration of plasma calcium and phosphorus, and promote bone calcification and osteoblast function and tissue maturation. When ingested, it can also produce biologically active osteotriol. Therefore, Vitamin D2 Injection can be used for the prevention and treatment of vitamin D deficiency, such as parenteral nutrition patients, gastrectomy and so on. It is also used in the treatment of patients with chronic hypocalcemia, hypophosphatemia, rickets and osteochondrosis with chronic renal insufficiency and hypoparathyroidism. Adverse reactions such as persistent headache, fatigue, fatigue and itchy skin may occur in some patients after use of the drug. It should be noted that patients with hypercalcemia, hyperphosphatemia with renal rickets, and vitamin D deficiency need to be prohibited from using it. In the process of medication need to closely monitor the serum urea nitrogen, creatinine, blood phosphorus, blood calcium and other changes, once abnormalities should be promptly communicated with the doctor, if necessary, the appropriate treatment. Vitamin D2 injection is a prescription drug, and drug interactions may occur when used together with other drugs. Patients need to communicate with the doctor before using the drug, such as personal medication, by the doctor to rule out the use of contraindications, to avoid serious risks of medication, do not blindly use their own medication.