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

Like all medications, Lipitor can cause side effects. According to the Mayo Clinic [2], some of the most common side effects of statins, including Lipitor, are muscle pain and damage, liver damage, digestive problems, rash or flushing, and increased blood sugar levels. However, most people who take statins do not experience serious side effects.

It is important to note that the benefits of taking statins, such as reducing the risk of heart attack and stroke, generally outweigh the risks of side effects. The Cleveland Clinic [3] recommends that people taking statins have their cholesterol levels checked regularly, typically every four to six months. The frequency of cholesterol checks may vary depending on individual health factors and the dosage of the medication.

In summary, Lipitor (atorvastatin) is a commonly prescribed medication used to lower cholesterol levels. While it can cause side effects, most people who take it do not experience serious issues. It is recommended that people taking statins, including Lipitor, have their cholesterol levels checked regularly, typically every four to six months.

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://my.clevelandclinic.org/health/treatments/22282-statins