Sodium nitroprusside is used for vasodilatation in hypertensive crisis, hypertensive encephalopathy, malignant hypertension, acute heart failure, including acute pulmonary edema. It is a vasodilator and is used for emergency blood pressure reduction in hypertensive emergencies such as hypertensive crisis, hypertensive encephalopathy, paroxysmal hypertension before and after surgery for pheochromocytoma, controlled blood pressure reduction during anesthesia, and acute heart failure such as acute heart failure in the event of acute infarction or valvular insufficiency. Adverse reactions are cyanide poisoning such as hypotension, coma, loss of pulse, blood pressure is lowered too quickly can be vertigo, arrhythmia, loss of consciousness, nausea and vomiting, tinnitus, shortness of breath, skin photosensitivity reaction, sudden discontinuation of the drug can be rebound elevation of blood pressure and so on. Compensated hypertension, congestive heart failure, optic nerve atrophy, pregnant women are prohibited. Tell your doctor if you are taking other drugs. Acute elevation of blood pressure and other conditions, it is recommended that immediate hospital consultation, not blindly self-medication, so as not to delay the condition, in addition to high blood pressure, heart disease people usually need to control the condition, appropriate activities.