Lipitor is a brand name for atorvastatin, which is a medication used to treat high cholesterol levels. According to Drug Patent Watch [1], Lipitor was approved by the FDA in 1996 and has since become one of the most commonly prescribed medications in the United States.

Like any medication, Lipitor can cause side effects. According to the Mayo Clinic [2], the most common side effects of statins (a class of drugs that includes Lipitor) are muscle pain and damage, liver damage, and digestive problems. However, these side effects are relatively rare and usually mild.

The NHS [3] lists several other possible side effects of atorvastatin, including headache, nausea, diarrhea, and joint pain. However, it notes that these side effects are also relatively rare.

Overall, while Lipitor can cause side effects, they are generally mild and relatively uncommon. However, as with any medication, it is important to talk to your doctor about any concerns you may have about taking it.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013
[3] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/