Lipitor is a medication that is commonly used to treat high cholesterol levels in the blood. According to the Drug Patent Watch [1], Lipitor contains the active ingredient atorvastatin, which works by inhibiting an enzyme in the liver that is responsible for producing cholesterol. This results in a decrease in the levels of LDL cholesterol (the "bad" cholesterol) in the blood.

A study published in the Journal of the American College of Cardiology [2] found that atorvastatin was effective in reducing the risk of cardiovascular events such as heart attacks and strokes in patients with high cholesterol levels. The study showed that patients who received atorvastatin had a 36% reduction in the risk of cardiovascular events compared to those who received a placebo.

Additionally, the National Center for Biotechnology Information [3] states that atorvastatin has been shown to be effective in reducing the risk of cardiovascular events in patients with or without existing heart disease, and is recommended as a first-line treatment for high cholesterol levels.

In conclusion, Lipitor (atorvastatin) has been shown to be an effective medication for reducing high cholesterol levels and reducing the risk of cardiovascular events in patients with or without existing heart disease. However, as with any medication, it is important to discuss the potential benefits and risks with a healthcare provider before starting treatment.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://pubmed.ncbi.nlm.nih.gov/17217414/
[3] https://www.ncbi.nlm.nih.gov/books/NBK548236/