Lipitor is a brand name for the drug atorvastatin, which is a type of statin used to lower cholesterol levels in the blood. While statins are generally safe and effective, they can cause side effects in some people. One of the most commonly reported side effects of statins is muscle pain and weakness, which can range from mild discomfort to severe and debilitating symptoms [2].

According to the Mayo Clinic, muscle pain and weakness associated with statin use is often referred to as statin-induced myopathy. This condition can range from mild muscle soreness to a potentially life-threatening condition called rhabdomyolysis, which is characterized by the breakdown of muscle tissue that can cause kidney damage and other serious complications [2].

However, it's important to note that severe muscle problems related to statin use are relatively rare. According to a study published in the Journal of Clinical Lipidology, only about 1% of patients taking statins experience serious muscle problems, and the risk is higher in people who take higher doses of the drugs or who have underlying health conditions that increase their risk of muscle damage [1].

Recent research has suggested that some people may be more susceptible to statin-related muscle problems due to genetic factors. A study published in the journal PLOS One found that people with a certain genetic variant were more likely to experience muscle pain and weakness while taking statins [3].

In summary, while muscle problems are a potential side effect of statin use, severe symptoms are relatively rare. Patients who experience muscle pain or weakness while taking statins should talk to their doctor, who may recommend adjusting the dose or switching to a different medication. Genetic testing may also be helpful in identifying patients who are at higher risk of statin-related muscle problems [2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013
[3] https://www.bhf.org.uk/what-we-do/news-from-the-bhf/news-archive/2019/august/scientists-identify-potential-cause-of-statin-related-muscle-pain