Simvastatin is one of the lipid-regulating drugs, like statin lipid-regulating drugs. The main purpose of simvastatin is to inhibit a special enzyme in the liver that synthesizes cholesterol, and the activity of this enzyme will be reduced after using simvastatin, and the level of cholesterol synthesis in the liver will be reduced. By using simvastatin, blood lipids, especially LDL cholesterol, can be regulated, so that high LDL cholesterol, bad cholesterol, can be reduced to normal or to the required standard after the application of lipid-regulating drugs. By using lipid-regulating drugs, such as simvastatin, we can help correct the disorders of lipid metabolism, hyperlipidemia and hypercholesterolemia, which can protect the cardiovascular and cerebrovascular vessels and reduce the risk of cardiovascular and cerebrovascular diseases. But the drug needs to be applied under the guidance of a doctor, and should be evaluated first whether it should be used, to what extent the blood lipids are high, whether there is cardiovascular disease and whether there is a risk of cardiovascular disease. And the dosage used, under the guidance of a doctor, choose an appropriate type and amount, review regularly to assess the efficacy and safety, and try to be able to stick to it in a safe and effective way.