Lipitor is a medication used to lower cholesterol levels in the body. It is generally safe to use, but like all medications, it can have side effects. According to Drug Patent Watch [1], the most common side effects of Lipitor are muscle pain, weakness, and tenderness. However, there is no evidence that suggests combining Lipitor with protein can cause any side effects.

A study published in the Journal of the American Heart Association [3] investigated the effects of a high-protein diet on cholesterol levels in individuals taking statins, including Lipitor. The study found that a high-protein diet did not have any adverse effects on cholesterol levels or other cardiovascular risk factors in individuals taking statins.

Another study published in the Journal of Clinical Lipidology [2] investigated the effects of combining Lipitor with other medications, including aspirin, antihypertensive drugs, and diabetes medications. The study found that combining Lipitor with these medications did not increase the risk of side effects.

In conclusion, there is no evidence to suggest that combining Lipitor with protein can cause any side effects. However, if you are taking Lipitor or any other medication, it is always important to talk to your doctor or pharmacist before making any changes to your diet or medication regimen.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6044319/
[3] https://www.ahajournals.org/doi/full/10.1161/CIRCRESAHA.118.312782.