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statin stat·in (stāt'n)
Any of a class of drugs that reduce serum cholesterol levels by inhibiting a key enzyme involved in the biosynthesis of cholesterol.
drug that acts to lower cholesterol levels by inhibiting the enzyme HMG-CoA (5-hydroxy-3-methylglutaryl-coenzyme A) reductase, which is required for cholesterol synthesis. Examples of statins include simvastatin, pravastatin, and lovastatin. Statins are generally quite safe, but side effects may include muscle pain and fatigue. A rare side effect called myopathy, characterized by muscle degeneration, has been associated with a mutation in a gene involved in mediating liver uptake of statins.