According to the sources provided, Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the body [1]. It belongs to a class of drugs called statins, which work by inhibiting an enzyme in the liver that produces cholesterol [2]. Lipitor is known to be effective in reducing LDL cholesterol, also known as "bad" cholesterol, which is a major risk factor for heart disease [2].

A study published in the Journal of the American Medical Association found that Lipitor reduced LDL cholesterol levels by an average of 39% [2]. Another study published in the New England Journal of Medicine showed that Lipitor reduced the risk of heart attack, stroke, and other cardiovascular events by 36% in patients with high cholesterol [2].

The Centers for Disease Control and Prevention (CDC) recommends statins, including Lipitor, as a first-line treatment for high cholesterol [3]. The CDC states that statins are effective in reducing LDL cholesterol levels and decreasing the risk of heart disease [3].

In conclusion, based on the sources provided, Lipitor has been shown to effectively lower cholesterol levels, particularly LDL cholesterol, and reduce the risk of cardiovascular events. It is recommended by the CDC as a first-line treatment for high cholesterol. However, it is important to note that individual results may vary and Lipitor should only be taken under the guidance of a healthcare provider [1][2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/248136
[3] https://www.cdc.gov/cholesterol/treating_cholesterol.htm