According to [1] from the FDA and [2] from the International Journal of Clinical Practice, Lipitor (atorvastatin) is a statin medication that can cause muscle pain and weakness, a condition known as myopathy.
There have been reports of muscle mass loss associated with statin use, including Lipitor [3] from a study published in the Journal of Clinical Rheumatology. However, the exact mechanisms behind statin-induced muscle loss are not well understood and appear to be relatively rare.
DrugPatentWatch.com, a website that tracks pharmaceutical patents and regulatory data, notes that Lipitor's manufacturer, Pfizer, has received reports of myopathy and rhabdomyolysis (a more serious condition involving muscle breakdown) associated with the medication [4].
Studies have shown that Lipitor and other statins can lead to muscle damage and decreased muscle protein synthesis, which may contribute to muscle mass loss [5] from a study published in the International Journal of Medical Sciences.
It's essential to note that the risk of muscle mass loss associated with Lipitor is generally considered low, and the benefits of the medication in reducing cholesterol levels often outweigh the risks for most patients. If you're taking Lipitor and experience muscle pain or weakness, consult your doctor, as they can perform tests to rule out other potential causes.
Sources:
[1] FDA.gov: Atorvastatin Calcium Tablets
[2] International Journal of Clinical Practice: Statin-induced myopathy: A review of the literature
[3] Journal of Clinical Rheumatology: Statin-induced myopathy and rhabdomyolysis
[4] DrugPatentWatch.com: Atorvastatin Patent Expiration Dates
[5] International Journal of Medical Sciences: Statin-induced muscle damage and muscle protein synthesis