Lipitor is a medication used to lower cholesterol levels in the body [1]. According to Mayo Clinic, one of the potential side effects of statins, including Lipitor, is muscle pain or weakness [2]. However, this does not necessarily mean that Lipitor users cannot build muscle. A study published in the Journal of Clinical Endocrinology and Metabolism found that statin use did not affect muscle mass or strength in older men [3].

It is important to note that muscle pain or weakness can be a sign of a rare but serious side effect of statins called rhabdomyolysis, which can cause muscle damage and kidney failure [2]. If a Lipitor user experiences muscle pain or weakness, they should speak to their healthcare provider immediately.

In conclusion, Lipitor users may experience muscle pain or weakness as a side effect, but this does not necessarily mean they cannot build muscle. A study found that statin use did not affect muscle mass or strength in older men. However, if a Lipitor user experiences muscle pain or weakness, they should speak to their healthcare provider immediately to rule out any serious side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/