Which medication is a lipid-lowering agent commonly used to treat hyperlipidemia?

• A. Simvastatin
• B. Losartan
• C. Gemfibrozil
• D. Cholestyramine

Answer: (A)

Potent reduction of LDL cholesterol with a medication class that inhibits cholesterol synthesis in the liver is the cornerstone of treating hyperlipidemia. Simvastatin is a member of this class, the statins, which inhibit HMG-CoA reductase, lowering hepatic cholesterol production and upregulating LDL receptors to clear LDL from the bloodstream. This leads to the greatest decrease in LDL-C among commonly used lipid-lowering agents and is the first-line therapy in most guidelines. The other options work differently: gemfibrozil is a fibrate mainly lowering triglycerides and can raise LDL in some cases; cholestyramine is a bile acid sequestrant that reduces cholesterol absorption but is less potent than statins; losartan is an antihypertensive, not a lipid-lowering drug. So simvastatin is the best choice because of its potent LDL-lowering effect and guideline-supported role as a first-line therapy.