Based on the information available, Lipitor (atorvastatin) usage may potentially lead to weight gain in some individuals, but it is not a common side effect. According to the Lipitor medication guide from the U.S. Food and Drug Administration (FDA) [1], weight gain is not listed as a common side effect. However, it is essential to note that Lipitor is a type of statin medication used to lower cholesterol levels, and individual responses to medications can vary.

A study published in the Journal of Clinical Lipidology [2] analyzed data from over 30,000 patients and found that statin therapy, including Lipitor, was not associated with significant weight changes. However, individual factors such as diet, lifestyle, and genetic predisposition can influence weight gain during Lipitor treatment.

It is crucial to consult with a healthcare professional regarding any concerns about weight gain or other potential side effects related to Lipitor usage. They can provide personalized guidance and recommendations based on individual health profiles.

In summary, while Lipitor usage may potentially lead to weight gain in some individuals, it is not a common side effect. Consult with a healthcare professional for personalized advice.

Sources:

1. [Lipitor Medication Guide](https://www.fda.gov/media/74330/download)
2. [Effect of Statins on Weight Change: A Systematic Review and Meta-Analysis](https://www.sciencedirect.com/science/article/pii/S1933287415001553)
3. [DrugPatentWatch.com - Lipitor](https://www.drugpatentwatch.com/drugs/lipitor)