Lipitor is a brand name for the drug atorvastatin, which is a medication used to lower cholesterol levels in the blood [1]. According to a study published in the Journal of Clinical Endocrinology and Metabolism, statins, including Lipitor, can cause muscle damage and decrease muscle mass in some individuals [2]. This muscle damage can lead to a condition called rhabdomyolysis, which is a severe breakdown of muscle tissue that can cause kidney damage and even failure [3].

However, it is important to note that muscle damage and decreased muscle mass are rare side effects of Lipitor and other statins. Most people who take these medications do not experience any muscle-related side effects. Additionally, the benefits of taking statins to lower cholesterol levels and reduce the risk of heart disease generally outweigh the risks of side effects.

In conclusion, Lipitor can potentially cause muscle damage and decrease muscle mass in some individuals, but these side effects are rare. It is important to speak with a healthcare provider about any concerns regarding the use of Lipitor or any other medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2949584/
[3] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/expert-answers/rhabdomyolysis/faq-20057817