Lipitor (atorvastatin) is a medication used to lower cholesterol levels and reduce the risk of heart attack and stroke. According to [1], the most common side effects of Lipitor include muscle and joint pain, diarrhea, and urinary tract infections. However, these side effects are generally mild and go away on their own.

More severe side effects of Lipitor include liver damage, kidney failure, and an increased risk of diabetes. These side effects are rare but can be serious. According to [2], if you experience any of the following symptoms while taking Lipitor, you should contact your doctor immediately:

- Yellowing of the skin or eyes
- Dark urine
- Unexplained fatigue or weakness
- Loss of appetite
- Nausea or vomiting
- Abdominal pain
- Swelling of the feet or ankles
- Difficulty breathing

In addition, Lipitor can interact with other medications, including blood thinners and antibiotics. It is important to tell your doctor about all the medications you are taking before starting Lipitor.

Overall, while Lipitor can cause some side effects, they are generally mild and go away on their own. However, more severe side effects are possible, and it is important to contact your doctor if you experience any concerning symptoms while taking Lipitor.

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/