Lipitor, also known as atorvastatin, is a medication used to reduce cholesterol levels in the body. According to the sources provided, there is no direct mention of Lipitor causing protein reduction as a side effect.

However, the sources do mention some possible side effects of taking Lipitor. The first source, Drug Patent Watch [1], lists the most common side effects of Lipitor as muscle pain, diarrhea, and upset stomach. The second source, a study published in the journal Circulation Research [2], notes that some patients may experience muscle-related side effects such as myopathy or rhabdomyolysis. These conditions involve muscle weakness or breakdown and can be serious, but they are rare.

The third source, a review published in the journal Current Atherosclerosis Reports [3], discusses the potential for statin medications like Lipitor to affect kidney function. The review notes that while some studies have suggested a possible link between statin use and reduced kidney function, the evidence is not conclusive and more research is needed.

Overall, while there is no direct mention of Lipitor causing protein reduction as a side effect, there are some potential side effects to be aware of when taking this medication. It is important to talk to your doctor about any concerns or questions you may have about taking Lipitor or any other medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ahajournals.org/doi/full/10.1161/CIRCRESAHA.118.312782
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6019636/