Lipitor is a medication used to lower cholesterol levels in the body. Atorvastatin is the active ingredient in Lipitor and works by reducing the production of cholesterol in the liver. Although Lipitor is an effective medication, it can cause side effects.

According to the sources provided, the common side effects of Lipitor include muscle pain, diarrhea, constipation, nausea, and headache. In some cases, Lipitor can also cause more serious side effects such as liver problems, allergic reactions, and muscle damage.

Liver problems may manifest as yellowing of the skin or eyes, dark urine, or abdominal pain. Allergic reactions may include hives, difficulty breathing, and swelling of the face, lips, tongue, or throat. Muscle damage can lead to muscle weakness, pain, and tenderness. In rare cases, Lipitor can cause a condition called rhabdomyolysis, which can lead to kidney damage and even death.

It is important to note that not everyone who takes Lipitor will experience side effects, and the severity of the side effects can vary from person to person. If you experience any side effects while taking Lipitor, you should contact your healthcare provider immediately.

In conclusion, Lipitor can cause side effects ranging from mild to severe. The most common side effects include muscle pain, diarrhea, constipation, nausea, and headache. However, Lipitor can also cause more serious side effects such as liver problems, allergic reactions, and muscle damage. If you experience any side effects while taking Lipitor, you should contact your healthcare provider immediately.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20067003