Lysine Calcium Hydrogen Phosphate needs to be taken at the recommended dosage to be effective and should not be taken in sudden large doses. The recommended dosage of 0.1g is 1 sachet at a time, 2 times a day is more appropriate, but should be taken under the standardized guidance of a doctor. Lysine Calcium Hydrogen Phosphate is a kind of compound preparation suitable for promoting the normal development of young children and supplementing calcium substances for children and pregnant women. However, abdominal discomfort, constipation, belching (hiccups) and other adverse reactions may occur when taking it. In addition to suffering from renal impairment or sudden large doses, nausea, vomiting, anorexia or abdominal pain may occur. Therefore, patients should take it within the recommended dose. Meanwhile, patients suffering from kidney stones, hypercalcemia, sarcoidosis are prohibited from taking this drug. Patients are advised to standardize the use of the drug according to the doctor’s prescription and avoid self-medication.