Magnesium sulfate injection is an aqueous solution belonging to magnesium sulfate, and its main clinical functions are anticonvulsant, blood pressure control and antispasmodic, which need to be standardized and applied under the guidance of clinicians. Magnesium sulfate injection can be used as anticonvulsant drugs; treatment of hypertension in pregnancy; can control eclampsia and pre-eclampsia; can be used to treat preterm labor, reduce uterine contractions. Hot flashes (a burst of fever), sweating, dry mouth, nausea and vomiting, dizziness, nystagmus, cardiorespiratory abnormalities, constipation, hypocalcemia, and pulmonary edema may occur after administration of Magnesium Sulfate Injection. Magnesium sulfate injection should be used with caution in people with abnormal renal function; myocardial damage and cardiac function abnormalities are prohibited; children, the elderly should be used with caution; lactating women are prohibited. During the use of magnesium sulfate injection, it is necessary to monitor renal function, cardiopulmonary function and neurological function; once obvious renal function abnormalities, tendon reflexes are weakened or disappeared, as well as cardiac rhythm abnormality and pulmonary edema occur during the use of the drug, it is necessary to discontinue the use of the drug and consult a doctor in time, so as to avoid the delay of the condition.