According to the sources provided, there have been recent updates on the safety of Lipitor, a cholesterol-lowering medication. The FDA issued a safety communication in 2012 [2] regarding the use of statin drugs, including Lipitor, which highlighted the potential risk of increased blood sugar levels, memory loss, and muscle damage. The FDA also required changes to the drug's label to reflect these risks.

The Mayo Clinic [3] states that muscle pain and weakness are the most common side effects of statins, including Lipitor. However, these side effects are usually mild and go away when the medication is discontinued. The article also notes that more serious side effects, such as liver damage, are rare.

DrugPatentWatch [1] provides information on the patent expiration of Lipitor, but does not provide any information on recent research on its safety.

In summary, while Lipitor has been shown to be an effective medication for lowering cholesterol levels, there are potential risks associated with its use, including muscle pain and weakness, increased blood sugar levels, memory loss, and liver damage. The FDA has required changes to the drug's label to reflect these risks, and patients taking Lipitor should be aware of these potential side effects and discuss any concerns with their healthcare provider.

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.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013