Lipitor, also known as atorvastatin, is a medication that is commonly used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], Lipitor is a brand name drug that was first approved by the FDA in 1996 and has since become available in generic form. While Lipitor is generally well-tolerated, some patients may experience muscle loss or weakness as a side effect of the medication.

According to a study published in the Journal of Clinical Medicine Research [2], muscle loss or weakness is a common side effect of statin medications like Lipitor. However, the study also notes that this side effect is usually reversible once the medication is discontinued. The study suggests that patients who experience muscle loss or weakness while taking Lipitor should speak with their healthcare provider about alternative treatment options.

In rare cases, the muscle loss or weakness caused by Lipitor can lead to a condition called rhabdomyolysis, which is a serious and potentially life-threatening condition that can cause kidney damage. According to the Mayo Clinic [3], rhabdomyolysis can occur when muscle tissue breaks down and releases a protein called myoglobin into the bloodstream. This can cause kidney damage and other complications. However, it is important to note that rhabdomyolysis is a rare side effect of Lipitor and is more likely to occur in patients who are taking high doses of the medication or who have other risk factors for the condition.

In conclusion, while muscle loss or weakness is a potential side effect of Lipitor, it is usually reversible once the medication is discontinued. Patients who experience this side effect should speak with their healthcare provider about alternative treatment options. Rhabdomyolysis is a rare but serious complication that can occur in some patients taking Lipitor, but it is more likely to occur in patients who are taking high doses of the medication or who have other risk factors for the condition.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/
[3] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/expert-answers/rhabdomyolysis/faq-20057817