Lipitor is a medication used to lower cholesterol levels in the blood. One of the potential side effects of Lipitor is stomach upset [3]. The duration of Lipitor-induced stomach upset may vary depending on the individual and the severity of the side effect. In general, the side effect should resolve within a few days to a week [2]. If the stomach upset persists or becomes severe, it is important to consult a healthcare provider [3]. Additionally, it is important to note that not all individuals who take Lipitor will experience stomach upset, and other side effects may occur [1].

Sources:
[1] Drug Patent Watch. (n.d.). Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] Medical News Today. (2019, January 28). Lipitor (atorvastatin): Side effects, dosage, uses, and more. Retrieved from https://www.medicalnewstoday.com/articles/323126
[3] Mayo Clinic. (2021, January 14). Statin side effects: Weigh the benefits and risks. Retrieved from https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013