Lipitor is a type of statin drug used to lower cholesterol levels in the blood. According to the Drug Patent Watch [1], Lipitor is one of the most widely prescribed drugs in the United States, and it is generally considered to be safe and effective. However, like all medications, it can have side effects.

Some of the common side effects of Lipitor, as listed by the Mayo Clinic [2], include muscle pain, weakness, and tenderness, as well as digestive problems such as nausea, diarrhea, and constipation. In rare cases, Lipitor can cause serious side effects such as liver damage, kidney problems, and muscle breakdown. The Mayo Clinic recommends that patients who experience any of these symptoms while taking Lipitor should contact their doctor immediately.

According to a report by the National Center for Biotechnology Information [3], statin drugs like Lipitor have been associated with a slightly increased risk of diabetes, but the benefits of taking these drugs to reduce the risk of heart disease generally outweigh the risks.

Overall, Lipitor is considered to be a safe and effective medication for lowering cholesterol levels. However, as with any medication, it is important to be aware of the potential side effects and to contact a doctor if any concerning symptoms arise.

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.ncbi.nlm.nih.gov/books/NBK548236/