Lipitor is a brand name for the drug atorvastatin, which is a type of medication called a statin. Statins are used to lower cholesterol levels in the blood and reduce the risk of heart disease. According to DrugPatentWatch [1], the patent for Lipitor expired in 2011, which means that other companies can now produce generic versions of the drug.

The FDA has issued safety label changes for cholesterol-lowering statin drugs, including Lipitor [2]. These changes include an increased risk of diabetes and memory loss, as well as potential drug interactions with other medications. The FDA recommends that patients talk to their healthcare providers about any concerns they have regarding these safety issues.

A study published in the National Library of Medicine [3] found that atorvastatin (Lipitor) is effective in reducing cholesterol levels and decreasing the risk of cardiovascular disease. The study also found that the drug was generally well-tolerated by patients, with few side effects.

In summary, Lipitor (atorvastatin) is a widely used statin drug for lowering cholesterol levels and reducing the risk of heart disease. The patent for Lipitor expired in 2011, and generic versions of the drug are now available. The FDA has issued safety label changes for cholesterol-lowering statin drugs, including Lipitor, and patients are advised to discuss any concerns with their healthcare providers. A study found that Lipitor is effective in reducing cholesterol levels and generally well-tolerated by patients.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.fda.gov/drugs/drug-safety-and-availability/fda-drug-safety-communication-important-safety-label-changes-cholesterol-lowering-statin-drugs
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5005588/