Lipitor, also known as atorvastatin, is a medication that is commonly used to lower cholesterol levels in the body. According to drugpatentwatch.com [1], Lipitor is a brand-name drug that is manufactured by Pfizer and was first approved by the FDA in 1996. It is a member of the statin drug class, which works by inhibiting an enzyme that is responsible for producing cholesterol in the liver.

A study published in the Journal of the American Medical Association [2] compared the effectiveness of atorvastatin (Lipitor) to other statins in reducing cholesterol levels. The study found that atorvastatin was more effective than other statins in reducing LDL cholesterol levels, which is the "bad" cholesterol that can lead to heart disease.

Another study published in the British Medical Journal [3] compared the effectiveness of atorvastatin to other statins in reducing the risk of cardiovascular events, such as heart attack and stroke. The study found that atorvastatin was more effective than other statins in reducing the risk of these events.

Overall, the available evidence suggests that atorvastatin (Lipitor) is an effective medication for reducing cholesterol levels and reducing the risk of cardiovascular events. However, it is important to note that the effectiveness of any medication can vary depending on individual factors, such as age, gender, and medical history. Therefore, it is important to discuss the use of Lipitor or any other medication with a healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://pubmed.ncbi.nlm.nih.gov/12860216/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1779361/