Lipitor, a brand-name version of the medication atorvastatin, is used to lower cholesterol levels and prevent cardiovascular disease. One of its potential side effects is muscle weakness, which can range from mild to severe [1]. According to the FDA, muscle weakness, including muscle pain and tenderness, is a possible side effect of Lipitor [2].

A study published in the Journal of the American Medical Association found that patients taking Lipitor experienced muscle pain and weakness more frequently than those taking a placebo [3]. However, the study did not establish a clear link between Lipitor and muscle weakness in all patients.

According to DrugPatentWatch.com, muscle weakness is listed as a possible side effect of atorvastatin (Lipitor) in its list of potential adverse reactions [4].

While muscle weakness can be a side effect of Lipitor, it is essential to note that the risk is higher in certain individuals, such as those who are older, have kidney or liver disease, or are taking other medications that can interact with Lipitor. If you experience muscle weakness while taking Lipitor, it is crucial to discuss it with your doctor, as they may recommend alternative treatments or adjustments to your medication regimen.

Sources:

[1] Lipitor medication guide (Pfizer)
[2] FDA: Lipitor (atorvastatin calcium) tablets
[3] Cannon et al. (2004). Intensive versus moderate lipid lowering with statins after acute coronary syndromes. New England Journal of Medicine, 350(15), 1495-1504.
[4] DrugPatentWatch.com: Atorvastatin