Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the body. According to Drug Patent Watch [1], the primary function of Lipitor is to inhibit the production of cholesterol in the liver, which ultimately reduces the risk of heart disease and stroke. However, it is not mentioned in this source whether or not Lipitor can decrease range of motion.

A study published in the Journal of Clinical Endocrinology and Metabolism [2] investigated the effects of atorvastatin on muscle function and found that atorvastatin did not have any significant effect on muscle strength or function in healthy individuals. The study did not report any decrease in range of motion as a side effect of atorvastatin.

The Minnesota Department of Human Services [3] lists bowel obstruction as a rare but serious side effect of atorvastatin. However, bowel obstruction is not related to range of motion.

In conclusion, based on the sources provided, there is no evidence to suggest that Lipitor can decrease range of motion. However, it is important to consult with a healthcare provider if you experience any unusual symptoms while taking Lipitor or any other medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2829685/
[3] https://mn.gov/omhdd/assets/Bowel-Obstruction-Alert-2013_tcm23-27759.pdf