Lipitor is a brand name for the drug atorvastatin, which is used to treat high cholesterol levels and reduce the risk of heart attack or stroke [2]. According to the sources provided, there is no direct evidence that Lipitor affects weight loss or gain.

However, one of the side effects of Lipitor is muscle pain or weakness [3]. This can lead to a decrease in physical activity, which may indirectly affect weight loss efforts. Additionally, some people may experience digestive issues such as nausea, diarrhea, or constipation while taking Lipitor [2]. These side effects could potentially affect appetite or digestion, which may impact weight loss efforts.

It is important to note that Lipitor should not be used as a weight loss medication. It is prescribed to treat high cholesterol levels and reduce the risk of heart disease, and should only be taken under the supervision of a healthcare provider [2].

In summary, Lipitor does not directly affect weight loss or gain, but its side effects may indirectly impact weight loss efforts. However, Lipitor should not be used as a weight loss medication and should only be taken as prescribed by a healthcare provider.

Sources:
[2] Healthline. (2021). Lipitor: Side effects, dosage, uses, and more. https://www.healthline.com/health/drugs/lipitor
[3] Mayo Clinic. (2021). Statin side effects: Weigh the benefits and risks. https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013
[4] Drug Patent Watch. (2021). Lipitor. https://www.drugpatentwatch.com/p/tradename/LIPITOR