Lipitor is a brand name for atorvastatin, which is a medication used to lower cholesterol levels and reduce the risk of heart disease [2]. While weight gain is not a known side effect of atorvastatin, it is possible that the medication could hinder weight loss efforts in some individuals. According to the Mayo Clinic, some common side effects of atorvastatin include muscle pain and weakness, which could make it difficult to exercise and maintain an active lifestyle [3]. Additionally, atorvastatin may increase blood sugar levels, which could lead to weight gain in some people [3]. However, it is important to note that the benefits of atorvastatin in reducing the risk of heart disease and stroke likely outweigh any potential negative effects on weight loss efforts. As with any medication, it is important to talk to a healthcare provider about any concerns or questions regarding the use of atorvastatin [2].

Sources:
[2] "Lipitor." Healthline, 16 July 2019, https://www.healthline.com/health/drugs/lipitor.
[3] "Atorvastatin (Oral Route) Side Effects." Mayo Clinic, 1 Aug. 2020, https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20067003?p=1.