Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels and reduce the risk of heart disease. According to the Drug Patent Watch [1], Lipitor is a statin drug that works by inhibiting the HMG-CoA reductase enzyme, which is responsible for the production of cholesterol in the liver. This action results in a decrease in the amount of low-density lipoprotein (LDL) or "bad" cholesterol in the bloodstream.

The National Center for Biotechnology Information [2] states that statins like Lipitor have been proven to be effective in reducing lipid absorption. In fact, statins have been shown to reduce LDL cholesterol levels by up to 50%, making them a popular treatment option for those with high cholesterol levels. Additionally, statins have been found to have other beneficial effects on the cardiovascular system, such as reducing inflammation and improving blood vessel function.

A study published in the Journal of Clinical Lipidology [3] found that Lipitor was effective in reducing lipid absorption in patients with hyperlipidemia, a condition characterized by high levels of lipids in the blood. The study showed that Lipitor significantly reduced LDL cholesterol levels, as well as triglyceride levels, which are another type of lipid.

In conclusion, based on the provided sources, Lipitor is an effective medication for reducing lipid absorption, particularly in patients with hyperlipidemia. It works by inhibiting the production of cholesterol in the liver, resulting in a decrease in LDL cholesterol levels. Statins like Lipitor have been shown to have other beneficial effects on the cardiovascular system as well.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/books/NBK395573/
[3] https://pubmed.ncbi.nlm.nih.gov/21371558/