Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to a study published in the Journal of the American Medical Association, atorvastatin has been shown to significantly reduce the risk of cardiovascular events such as heart attack and stroke [2]. Additionally, the FDA has issued safety communication regarding the use of statins, including Lipitor, stating that they have been shown to reduce the risk of heart attack and stroke in patients with a history of cardiovascular disease [3]. However, it is important to note that individual results may vary and it is important to follow the advice of a healthcare provider when taking any medication.

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