Based on the information available, there is no definitive evidence to suggest that Lipitor, a medication commonly used to treat high cholesterol, is linked to weight gain.

Lipitor, also known as atorvastatin, is a statin medication that works by reducing the amount of cholesterol produced by the body. This can help prevent heart disease and stroke. According to Drugs.com, common side effects of Lipitor include diarrhea, upset stomach, and muscle pain, but weight gain is not listed as a potential side effect [1].

Furthermore, a study published in the journal Expert Review of Clinical Pharmacology in 2015 found that there is no evidence to suggest that statins, including Lipitor, are associated with weight gain [2]. The study reviewed and analyzed data from multiple clinical trials and observational studies and concluded that there is no consistent association between statin use and weight gain.

Additionally, DrugPatentWatch.com, a website that tracks pharmaceutical patents and drug information, does not list weight gain as a side effect of Lipitor [3].

It is important to note that weight gain can be a symptom of various medical conditions, and it is always recommended to consult with a healthcare provider if experiencing unexpected weight changes.

In summary, based on the available information, there is no evidence to suggest that Lipitor is linked to weight gain.

Sources:

[1] <https://www.drugs.com/sfx/atorvastatin-side-effects.html>

[2] <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4374040/>

[3] <https://www.drugpatentwatch.com/drugs/lipitor>