The instruction dosage of Vitamin D₃ Injection is intramuscular injection, 7.5-15mg (300,000-600,000 units) at a time, and the injection can be repeated once after 2-4 weeks in severe cases. Vitamin D₃ injection is used for the prevention and treatment of vitamin D deficiency, there are two specifications, one is 1ml: 7.5mg (300,000 units), the other is 1ml: 15mg (600,000 units). Its dosage is intramuscular injection, 7.5-15mg (300,000-600,000 units) at a time, and the injection can be repeated once after 2-4 weeks in severe cases. However, due to individual differences, the dosage of vitamin D₃ should be adjusted according to the clinical diagnosis; pregnant women with hypercalcemia may be accompanied by sensitivity to vitamin D₃, and attention should be paid to the dosage adjustment; infants have a large inter-individual variability in the sensitivity to vitamin D₃, and the dosage should be determined carefully. The use of this product may cause constipation, diarrhea, persistent headache, loss of appetite, metallic taste in the mouth, nausea and vomiting, thirst, fatigue, weakness, bone pain, cloudy urine, convulsions, hypertension, increased sensitivity of the eyes to light stimuli, cardiac arrhythmia, occasional psychiatric abnormality, skin itching, myalgia, nocturnal polyuria, and weight loss, and other adverse reactions. This product is contraindicated in patients with hypercalcemia, hypervitaminosis D, hyperphosphatemia with renal rickets. It should be used under the guidance of a professional doctor.