Based on the available information, there is no direct evidence that Lipitor, a medication used to treat high cholesterol, affects physical stamina.

The first source, a drug patent watch website, provides information about Lipitor's patent and manufacturer but does not include data on its effects on physical stamina [1]. The second source is a publication that discusses the effect of exercise training on lipid-lowering medication, including statins like Lipitor, but it does not mention any direct impact on physical stamina [2].

The third source is a study published in the Journal of Clinical Lipidology, which investigates the effects of atorvastatin (Lipitor) on muscle function and physical performance in the elderly. The study found that atorvastatin did not impair muscle function or physical performance in older adults [3].

Therefore, based on the available information, there is no evidence to suggest that Lipitor directly affects physical stamina. However, it is always recommended to consult with a healthcare provider about any concerns related to medications and their potential side effects.

Sources:
[1] <https://www.drugpatentwatch.com/p/tradename/LIPITOR>
[2] <https://pubmed.ncbi.nlm.nih.gov/28807461/>
[3] <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2949584/>