Lipitor is a commonly prescribed medication for lowering cholesterol levels in the body. However, like any other medication, it can cause side effects. According to the Mayo Clinic [3], the most common side effects of Lipitor include muscle pain, weakness, and tenderness. These symptoms are more common in elderly patients who are taking higher doses of the medication. The article also mentions that some patients may experience liver damage, but this is rare.

A study published in the National Library of Medicine [2] examined the use of statins, including Lipitor, in elderly patients. The study found that while statins are generally safe and well-tolerated in this population, some patients may experience side effects such as muscle pain, weakness, and gastrointestinal symptoms. The study also notes that elderly patients may be more susceptible to drug interactions and should be closely monitored when taking Lipitor.

Another source, Drug Patent Watch [1], lists several possible side effects of Lipitor, including headache, diarrhea, constipation, and nausea. However, the site notes that these side effects are generally mild and go away on their own.

In conclusion, the most common side effects of Lipitor in elderly patients include muscle pain, weakness, and tenderness. While these symptoms are generally mild, patients should be closely monitored for any signs of liver damage or drug interactions. If any side effects are experienced, patients should speak with their healthcare provider to determine the best course of action.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6915405/
[3] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013