Lipitor is a medication used to treat high cholesterol and reduce the risk of heart disease. Like all medications, Lipitor can cause side effects. The severity of these side effects can vary depending on the individual.

Common side effects of Lipitor include muscle and joint pain, nausea, diarrhea, and headache [2]. These side effects are usually mild and go away on their own after a short period of time. However, some people may experience more severe side effects.

One of the more serious side effects of Lipitor is muscle damage, which can lead to a condition called rhabdomyolysis [1]. This condition occurs when muscle tissue breaks down and releases a protein called myoglobin into the bloodstream. Myoglobin can cause kidney damage and even kidney failure. Symptoms of rhabdomyolysis include muscle pain, weakness, and dark urine.

Another potential side effect of Lipitor is liver damage, although this is rare [3]. Symptoms of liver damage include yellowing of the skin or eyes, abdominal pain, and dark urine.

In rare cases, Lipitor can also cause an allergic reaction. Symptoms of an allergic reaction include hives, difficulty breathing, and swelling of the face, lips, tongue, or throat [2].

It is important to talk to your doctor if you experience any side effects while taking Lipitor. Your doctor may adjust your dosage or switch you to a different medication. In some cases, it may be necessary to stop taking Lipitor altogether.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.drugwatch.com/lipitor/side-effects/