Lipitor, also known as atorvastatin, is a medication that is commonly prescribed to treat high cholesterol levels. According to the Drug Patent Watch [1], Lipitor has been on the market since 1996 and is one of the most widely prescribed drugs in the world.

While Lipitor is generally considered to be safe and effective, some patients may experience muscle-related side effects. A study published in the Journal of Clinical and Diagnostic Research [2] found that muscle-related side effects, such as muscle pain and weakness, are common in patients taking atorvastatin. However, the study also found that these side effects are generally mild and can be managed with appropriate treatment.

Another study published in the Journal of Medical Case Reports [3] reported a case of a patient who experienced severe muscle pain and weakness while taking atorvastatin. The patient's symptoms improved after the medication was discontinued.

In conclusion, while Lipitor is generally considered to be safe and effective, some patients may experience muscle-related side effects. These side effects are generally mild and can be managed with appropriate treatment. However, in rare cases, severe muscle pain and weakness may occur, and patients should be aware of this possibility. It is important for patients to discuss any concerns or symptoms with their healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4972163/
[3] https://pubmed.ncbi.nlm.nih.gov/37019582/