Lipitor is a brand name for atorvastatin, which is a medication used to treat high cholesterol levels and reduce the risk of heart disease. While Lipitor is generally considered safe, there are some potential side effects that patients should be aware of.

According to Drug Patent Watch [1], some of the most common side effects of Lipitor include headache, muscle pain, joint pain, nausea, diarrhea, and constipation. These side effects are usually mild and go away on their own, but patients should still report them to their doctor if they persist or become severe.

In rare cases, Lipitor can cause more serious side effects. For example, Lipitor can cause liver damage, which can lead to jaundice, dark urine, and abdominal pain. Patients should report any of these symptoms to their doctor immediately [2]. Additionally, Lipitor can cause muscle damage, which can lead to muscle pain, weakness, and tenderness. In rare cases, this can lead to a condition called rhabdomyolysis, which can cause kidney damage. Patients should report any muscle pain or weakness to their doctor immediately [3].

It's important to note that Lipitor can interact with other medications, including some antibiotics, antifungal medications, and HIV medications. Patients should always tell their doctor about all the medications they are taking before starting Lipitor [2].

In conclusion, while Lipitor is generally considered safe, it can cause some side effects, including headache, muscle pain, and nausea. In rare cases, it can cause liver damage, muscle damage, and rhabdomyolysis. Patients should report any side effects to their doctor immediately and tell their doctor about all the medications they are taking before starting Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/books/NBK548236/
[3] https://journals.sagepub.com/doi/full/10.1177/23247096211014050