Lipitor is a brand name for the drug atorvastatin, which is a type of medication known as a statin. Statins are used to lower cholesterol levels in the blood, which can help reduce the risk of heart disease and stroke [2].

Cholesterol is a waxy substance that is found in the body and is necessary for the production of hormones, vitamin D, and other substances. However, too much cholesterol in the blood can lead to the buildup of plaque in the arteries, which can increase the risk of heart disease and stroke [2].

Lipitor works by blocking the enzyme in the liver that is responsible for producing cholesterol, which helps to lower the levels of cholesterol in the blood [3]. It is typically prescribed to people who have high levels of LDL cholesterol (the "bad" cholesterol) or who have a history of heart disease or stroke [2].

According to DrugPatentWatch, the patent for Lipitor expired in 2011, which means that generic versions of the drug are now available [1]. This has made the medication more affordable and accessible to people who need it.

It is important to note that while Lipitor and other statins can be effective in lowering cholesterol levels, they can also have side effects. Some common side effects of Lipitor include muscle pain, weakness, and liver problems [2]. It is important to talk to a healthcare provider about the risks and benefits of taking Lipitor or any other medication for high cholesterol.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statins/art-20045772
[3] https://www.medicalnewstoday.com/articles/248136