statin

Your liver runs a small assembly line that builds cholesterol. A statin is a clever decoy that jams the most important machine on that line, so the factory makes far less cholesterol than it otherwise would. With less being made, the liver pulls more cholesterol out of the blood, lowering levels.

The targeted machine is HMG-CoA reductase, the enzyme that converts HMG-CoA into mevalonate, the committed and rate-limiting step of cholesterol biosynthesis. Every statin carries a chemical group that mimics the natural substrate's transition state: a dihydroxy acid (or a lactone that opens to it in the body) that binds the enzyme's active site tightly, far more tightly than the real substrate.

Early statins such as lovastatin and simvastatin were natural products or close derivatives, while later 'synthetic' statins such as atorvastatin and rosuvastatin were designed with larger aromatic groups for higher potency and longer action. They are among the most prescribed drugs in the world for lowering cardiovascular risk.

A fair caveat: statins are generally well tolerated, but a minority of users experience muscle aches, and rare liver or muscle injury can occur, so the benefit-risk balance is judged for each patient.