There is no direct scientific evidence to suggest that taking Lipitor, a medication used to treat high cholesterol, will result in a change in gym stamina. Lipitor works by lowering the levels of "bad" cholesterol and fats in the blood, which can help prevent strokes and heart attacks [1].

It's important to note that Lipitor can have side effects, such as muscle pain, nausea, and diarrhea [1]. These side effects may impact a person's ability to exercise or perform physical activities, but they do not specifically affect stamina.

Additionally, it is worth noting that regular exercise can help lower cholesterol levels, potentially reducing the need for medications like Lipitor [2]. However, it is essential to consult with a healthcare provider before starting any new exercise program or making changes to medication.

In summary, there is no evidence to suggest that Lipitor use directly impacts gym stamina. While Lipitor can have side effects that may impact physical activity, it does not specifically affect stamina. Regular exercise can help lower cholesterol levels, but it is important to consult with a healthcare provider before making any changes to medication or exercise routines.

Sources:
[1] Lipitor (atorvastatin) tablets, for oral use. (2018). Retrieved from <https://www.accessdata.fda.gov/drugsatfda_docs/label/2018/020990s051,021160s015,021172s009lbl.pdf>
[2] High cholesterol: Symptoms & causes. (2021). Retrieved from <https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/symptoms-causes/syc-20353198>
[3] Cholesterol medications: What to know about statins. (2020). Retrieved from <https://www.health.harvard.edu/heart-health/cholesterol-medications-what-to-know-about-statins>
[4] DrugPatentWatch. (n.d.). Lipitor. Retrieved from <https://www.drugpatentwatch.com/drugs/lipitor>