Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the body. It belongs to a class of drugs called statins, which work by inhibiting an enzyme that is involved in cholesterol production in the liver. While Lipitor is generally considered safe and effective, it can cause side effects in some people.

According to Drug Patent Watch [1], the most common side effects of Lipitor include muscle pain, weakness, and tenderness, as well as gastrointestinal symptoms such as nausea, diarrhea, and constipation. Other possible side effects include headache, dizziness, insomnia, and skin rash.

Medical News Today [2] notes that Lipitor can also cause more serious side effects, although these are rare. These include liver damage, which can lead to jaundice, dark urine, and abdominal pain, as well as an increased risk of developing diabetes. Lipitor can also cause muscle damage, which can lead to a condition called rhabdomyolysis, where muscle fibers break down and release a protein called myoglobin into the bloodstream. This can cause kidney damage and even kidney failure in severe cases.

The National Center for Biotechnology Information [3] adds that Lipitor can interact with other medications, including some antibiotics, antifungal drugs, and HIV medications, which can increase the risk of side effects. It is important to inform your doctor of all medications you are taking before starting Lipitor.

In conclusion, Lipitor is a widely used medication to lower cholesterol levels, but it can cause side effects in some people. The most common side effects include muscle pain, weakness, and gastrointestinal symptoms, while more serious side effects such as liver damage and muscle damage are rare. Lipitor can also interact with other medications, so it is important to inform your doctor of all medications you are taking before starting Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/drugs-lipitor-side-effects
[3] https://www.ncbi.nlm.nih.gov/books/NBK430779/