Uradil injection can treat acute left heart failure. The main effect of uradil is to inhibit the α-receptor, with the effect of dilating peripheral blood vessels, can reduce blood pressure, reduce the volume of return blood, clinically can be used in the treatment of acute left heart failure. Acute left heart failure is a clinical syndrome caused by a serious decline in left heart function, the rapid increase in blood pressure is one of the main causes, accompanied by pulmonary edema, uradil by lowering the level of blood pressure, can reduce the anterior and posterior load, reduce the volume of return blood, reduce pulmonary edema, alleviate the patient’s symptoms of dyspnea. Adverse effects of uradil include decreased blood pressure, tachycardia, dizziness, irritability, dyspnea, etc. It is contraindicated in women with allergy to drug ingredients, severe aortic stenosis, and lactation during pregnancy. Uradil rescue acute left heart failure, must be used under the guidance of a professional cardiologist, to avoid blindly using the drug on their own.