Lipitor is a medication used to lower cholesterol levels in the blood. It is a brand name for the generic drug atorvastatin [1]. According to a study published in the US National Library of Medicine, atorvastatin has been shown to be more effective than other statins in reducing LDL cholesterol levels [2].

In terms of effectiveness, Lipitor has been shown to be very effective in reducing LDL cholesterol levels, which is the "bad" cholesterol. According to the drug's FDA label, Lipitor has been shown to reduce LDL cholesterol levels by 39% to 60% depending on the dose and individual patient response [3]. The label also states that Lipitor has been shown to reduce the risk of heart attack and stroke in patients with multiple risk factors for heart disease, including high blood pressure, smoking, and diabetes [3].

It is important to note that like all medications, Lipitor may not be effective for everyone and may have side effects. The most common side effects of Lipitor include muscle and joint pain, diarrhea, and constipation [3]. It is also important to discuss with a healthcare provider whether Lipitor is the best treatment option for an individual patient based on their medical history and other factors.

In conclusion, Lipitor has been shown to be a very effective medication for reducing LDL cholesterol levels and reducing the risk of heart attack and stroke in patients with multiple risk factors for heart disease. However, it is important to discuss with a healthcare provider whether Lipitor is the best treatment option for an individual patient based on their medical history and other factors [2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1779361/
[3] https://www.accessdata.fda.gov/drugsatfda_docs/label/2019/020702s073lbl.pdf