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Lipitor, a medication commonly prescribed to lower cholesterol levels, does not directly affect protein absorption in patients. It is a statin, a type of drug that inhibits the HMG-CoA reductase enzyme, which plays a crucial role in the production of cholesterol in the body [1].

However, Lipitor can interact with other medications that affect protein absorption. For instance, certain bile acid sequestrants, such as cholestyramine and colestipol, used to treat high cholesterol, can reduce the absorption of Lipitor and other drugs by binding to them in the digestive tract [2]. This binding process prevents these drugs from being absorbed into the bloodstream, which could potentially impact protein absorption indirectly.

It is important to note that Lipitor does not have a direct impact on protein absorption in patients. Any effects on protein absorption would be secondary and indirect, resulting from Lipitor's interaction with other medications.

Sources:
[1] "Lipitor." MedlinePlus, U.S. National Library of Medicine, 16 Nov. 2020, medlineplus.gov/druginfo/meds/a601263.html.
[2] "Lipitor Interactions." Drugs.com, www.drugs.com/drug-interactions/atorvastatin-with-colestipol-322-127-132-137.html.
[3] "Atorvastatin (Oral Route) Side Effects." Mayo Clinic, Mayo Foundation for Medical Education and Research, 1 Sept. 2020, www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20069881?p=1.