Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to the drug label provided by the FDA [2], Lipitor has been associated with several adverse reactions. The most common adverse reactions reported with Lipitor include headache, musculoskeletal pain, diarrhea, and nasopharyngitis. Other common side effects include urinary tract infection, dyspepsia, and nausea. Additionally, some patients may experience liver function abnormalities, which can be detected through blood tests.

In rare cases, Lipitor has been associated with more serious adverse reactions, such as myopathy and rhabdomyolysis. Myopathy is a condition that causes muscle weakness, while rhabdomyolysis is a severe form of myopathy that can lead to kidney failure. The risk of developing myopathy or rhabdomyolysis is increased when Lipitor is taken in combination with certain medications, such as cyclosporine, fibrates, or niacin. Patients who experience muscle pain, tenderness, or weakness while taking Lipitor should contact their healthcare provider immediately.

It is important to note that Lipitor may not be suitable for everyone, and patients should discuss their medical history and any medications they are taking with their healthcare provider before starting treatment. Pregnant or breastfeeding women should not take Lipitor, as it may harm the fetus or infant.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.accessdata.fda.gov/drugsatfda_docs/label/2019/020702s073lbl.pdf
[3] https://www.ncbi.nlm.nih.gov/books/NBK430779/