Intravenous magnesium sulfate need to do the following precautions: 1, such as high blood pressure or the emergence of hypertensive patients must monitor vital signs, such as heart rate, blood pressure, pulse, oxygen saturation, etc., must monitor and adjust the drip rate when dripping magnesium sulfate. 2, the application of magnesium sulfate injection must check the patient’s renal function in advance, such as patients with severe renal insufficiency must be disabled. 3, patients in the intravenous 4, before and in the process of medication should be given to the patient to do the examination of the knee tendon reflex, and to observe the patient’s urine volume, such as a sudden decrease in urine volume and knee tendon reflex suddenly weakened, disappeared immediately stop the medication. 5, static point in the process of sudden chest tightness, shortness of breath, breathing difficulties must be Immediately discontinue the medication, such as acute magnesium sulfate poisoning can be rescued with injectable calcium.