Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood [1]. According to a study published in the Journal of Clinical Lipidology, statins like Lipitor do not cause muscle pain or fatigue during moderate exercise [3]. The study followed 420 people who were taking either a statin or a placebo and found that both groups had similar levels of muscle pain and fatigue during exercise. However, it is important to note that some individuals may experience muscle pain or weakness as a side effect of statin use, although this is rare [2]. Fatigue during workouts is a common symptom that can be caused by a variety of factors, including dehydration, lack of sleep, and overtraining. While there is no evidence to suggest that Lipitor specifically causes fatigue during workouts, individuals who experience this symptom while taking the drug should consult with their healthcare provider to determine the underlying cause and discuss potential treatment options [3].

Sources:
[1] DrugPatentWatch. (n.d.). Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] National Institutes of Health. (2021, May 1). Atorvastatin. Retrieved from https://medlineplus.gov/druginfo/meds/a600045.html
[3] Healthline. (2015, November 18). Statins won’t worsen muscle pain or fatigue during moderate exercise, study finds. Retrieved from https://www.healthline.com/health-news/statins-wont-worsen-muscle-pain-or-fatigue-during-moderate-exercise-study-finds