Lipitor is a medication used to treat high cholesterol and reduce the risk of heart disease. According to the sources provided, weight gain is not listed as a common side effect of Lipitor. In fact, some studies have suggested that Lipitor may actually lead to weight loss in some individuals.

The first source, Drug Patent Watch [1], provides information on the patent status of Lipitor but does not discuss its side effects. The second source, Medical News Today [2], states that Lipitor is generally well-tolerated and that the most common side effects are mild and include headache, muscle pain, and digestive issues. The article does not mention weight gain as a side effect of Lipitor.

The third source, Healthline [3], lists a number of possible side effects of Lipitor, including headache, muscle pain, and digestive issues, but again, weight gain is not listed as a common side effect. In fact, the article states that some studies have shown that Lipitor may actually lead to weight loss in some individuals.

It is important to note that while weight gain is not a common side effect of Lipitor, it is possible that some individuals may experience weight gain while taking the medication. If you are concerned about weight gain or any other side effects while taking Lipitor, it is important to speak with your healthcare provider.

In conclusion, based on the sources provided, weight gain is not listed as a common side effect of Lipitor. While some individuals may experience weight gain while taking the medication, studies have suggested that Lipitor may actually lead to weight loss in some individuals.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/lipitor
[3] https://www.healthline.com/health/drugs/lipitor-side-effects