Sodium nitroprusside is mainly applicable to the emergency of hypertension, or acute heart failure; however, there is no specific symptom for which it is clearly suitable. 1. Sodium nitroprusside is mainly used in some hypertensive crisis, hypertensive encephalopathy, malignant hypertension, pheochromocytoma preoperative and postoperative paroxysmal hypertension emergency blood pressure reduction, symptomatic treatment. 2. Sodium nitroprusside is suitable for subacute heart failure, including acute pulmonary edema, can also be used for acute myocardial infarction or mitral or aortic valve closure insufficiency in the treatment of acute heart failure. Sodium nitroprusside is contraindicated in compensated hypertension such as arteriovenous shunt or aortic constriction. Thiocyanate poisoning or overdose, such as blurred vision, speech disorders, vertigo and other symptoms; as well as cyanide poisoning or overdose, manifested by loss of reflexes, coma, distant heart sounds, hypotension, loss of pulse, pink skin, shallow respiration, pupil dilatation, need to be sent to the hospital for emergency medical treatment immediately. If you need to use this product, please be instructed by a professional doctor, do not use it blindly by yourself.