Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the body. According to the sources provided, Lipitor is considered to be a highly effective medication for reducing cholesterol levels.

One study found that Lipitor was more effective than simvastatin, another commonly prescribed cholesterol-lowering medication, in reducing LDL cholesterol levels [2]. The study also found that Lipitor was better tolerated by patients, with fewer side effects reported.

Furthermore, Lipitor is classified as a high-intensity statin, meaning it has been shown to significantly reduce LDL cholesterol levels by at least 50% [3]. This is compared to moderate-intensity statins, such as simvastatin, which have been shown to reduce LDL cholesterol levels by 30-50% [3].

However, it is important to note that the effectiveness of a medication can vary depending on the individual. Some patients may respond better to simvastatin or another cholesterol-lowering medication. It is also important to consider potential side effects and other factors when determining the best medication for a patient.

Overall, Lipitor is considered to be a highly effective medication for reducing cholesterol levels and is classified as a high-intensity statin. However, the effectiveness of a medication can vary depending on the individual, and other factors should be considered when determining the best medication for a patient.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.singlecare.com/blog/atorvastatin-vs-simvastatin/
[3] https://www.goodrx.com/classes/statins/intensity-comparison-chart