Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood. According to the Drug Patent Watch [1], Lipitor is a trademark of Pfizer and was first approved by the FDA in 1996. The patent for Lipitor expired in 2011, allowing for the production of generic versions of the medication.

A study published in the Journal of the American College of Cardiology [2] evaluated the effectiveness of atorvastatin in reducing the risk of cardiovascular events in patients with coronary artery disease. The study found that atorvastatin significantly reduced the risk of major cardiovascular events, including heart attack and stroke, in patients with coronary artery disease.

The FDA-approved label for Lipitor [3] states that the medication is indicated for the treatment of high cholesterol, as well as the prevention of cardiovascular disease. The label also notes that Lipitor should be used in conjunction with a healthy diet and exercise regimen.

In summary, Lipitor (atorvastatin) is a medication used to lower cholesterol levels and reduce the risk of cardiovascular events. The drug has been found to be effective in reducing the risk of major cardiovascular events in patients with coronary artery disease. The patent for Lipitor has expired, allowing for the production of generic versions of the medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3016087/
[3] https://www.accessdata.fda.gov/drugsatfda_docs/label/2009/020702s057lbl.pdf