Simvastatin is a medication used to lower cholesterol levels in the blood. It belongs to a class of drugs called statins, which work by blocking a substance your body needs to make cholesterol. By reducing cholesterol, simvastatin helps prevent heart disease and stroke. Doctors often prescribe simvastatin to patients with high cholesterol or those at risk for cardiovascular issues. It is usually taken once daily, and patients may need regular blood tests to monitor cholesterol levels and liver function while on this medication.