Lipitor is a statin drug that is used to lower cholesterol levels in the body. According to the sources provided, Lipitor has been effective in reducing cholesterol levels in patients.

The drug patent watch website [1] states that Lipitor (atorvastatin calcium) is a medication used to treat high cholesterol and is one of the most widely prescribed drugs in the United States. Lipitor works by inhibiting an enzyme in the liver that produces cholesterol, which helps to lower the overall cholesterol levels in the body.

The Mayo Clinic [2] explains that statins, including Lipitor, are effective in reducing low-density lipoprotein (LDL) cholesterol levels, which is commonly referred to as "bad" cholesterol. LDL cholesterol can build up in the walls of arteries, leading to the development of atherosclerosis, a condition that can increase the risk of heart disease and stroke. Statins can also help to reduce triglyceride levels and increase high-density lipoprotein (HDL) cholesterol levels, which is known as "good" cholesterol.

Medical News Today [3] reports that studies have shown that Lipitor can reduce LDL cholesterol levels by up to 60%, and can also reduce the risk of heart attack, stroke, and other cardiovascular events in patients with high cholesterol levels. However, the article notes that Lipitor may cause side effects in some patients, such as muscle pain and weakness, liver damage, and an increased risk of diabetes.

In conclusion, Lipitor has been shown to be an effective medication for lowering cholesterol levels in the body, particularly LDL cholesterol levels. However, as with any medication, Lipitor may cause side effects in some patients and should only be used under the supervision of a healthcare professional.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statins/art-20045772
[3] https://www.medicalnewstoday.com/articles/248136