Puerarin, also known as Pueraria lobata, is an isoflavone derivative with coronary expansion effect isolated from the Chinese medicine Pueraria lobata. Its effects mainly include dilating blood vessels, improving blood circulation, reducing myocardial oxygen consumption, inhibiting cancer cells, increasing coronary flow, adjusting blood microcirculation, treating sudden deafness in all ages, and reducing the risk of cardiovascular diseases. It is mainly used clinically to treat: 1) ischemic heart disease, such as coronary atherosclerotic heart disease, angina pectoris, myocardial infarction; 2) fundus disease, such as retinal arteriovenous obstruction, optic nerve atrophy; 3) sudden deafness; 4) ischemic cerebrovascular disease, such as cerebral vasospasm, cerebral infarction, cerebral thrombosis; 5) cardiac arrhythmia, such as ventricular preterm contraction, ventricular tachycardia, etc.