Lipitor is a medication that is commonly used to lower cholesterol levels in the body. While there is evidence to suggest that Lipitor can cause a decrease in protein levels, the speed at which this occurs is not clear.

According to DrugPatentWatch [1], Lipitor's active ingredient, atorvastatin, has been shown to cause a decrease in protein levels in some patients. However, the website does not provide any specific information about the speed at which this occurs.

A study published in the Journal of Lipid Research [2] found that treatment with atorvastatin did lead to a decrease in the levels of some proteins in the blood. However, the study did not provide any information about how quickly this decrease occurred.

Another study published in the journal Atherosclerosis [3] found that treatment with atorvastatin did not lead to a significant decrease in protein levels in the blood. However, this study was conducted on a small group of patients and the results may not be applicable to everyone.

Overall, while there is evidence to suggest that Lipitor can cause a decrease in protein levels, the speed at which this occurs is not clear. More research is needed to fully understand the effects of Lipitor on protein levels.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2918453/
[3] https://pubmed.ncbi.nlm.nih.gov/17673884/