Atorvastatin is statin-class drug commonly prescribed for the treatment of dyslipidemias and for the prevention of ischemic cardiovascular events.  It works by inhibiting hydroxymethylglutaryl-coenzyme A (HMG-CoA) reductase, a key enzyme in the cholesterol biosynthetic pathway.  Inhibition of HMG-CoA reductase decreases hepatic cholesterol synthesis, increases hepatic cholesterol re-uptake, and decreases serum cholesterol levels.