Lipitor (atorvastatin) is a single. Drug (statin). Vytorin (ezetimibe and simvastatin) is a combo pill which contains a statin, Simvastatin along with ezetimibe which inhibits cholesterol absorbtion at the small intestine.
Some. Both are statin drugs. Vytorin (ezetimibe and simvastatin) adds a second agent in the pill. Cholesterol levels lowered to similar extent.