Lipitor, a medication commonly used to treat high cholesterol, has not been directly linked to causing joint stiffness as a side effect [1]. However, some studies suggest that statins, the class of drugs that Lipitor belongs to, might have an impact on joint-related symptoms.

A study published in the Archives of Internal Medicine in 2010 found that statin use was associated with an increased risk of muscle and joint pain [2]. However, the study did not specifically investigate Lipitor, and the exact mechanism through which statins might affect joints is not fully understood.

Another study in the Journal of Rheumatology in 2013 suggested that statin use might be associated with an increased risk of developing polymyalgia rheumatica, a condition characterized by muscle and joint pain [3]. However, the study did not find a significant association between statin use and joint stiffness.

It is important to note that individual responses to medications can vary, and some people may experience joint stiffness or other symptoms while taking Lipitor or other statins. If you are taking Lipitor and experiencing joint stiffness or other unusual symptoms, it is recommended that you speak with your healthcare provider.

In summary, while Lipitor has not been directly linked to causing joint stiffness, some studies suggest that statins may have an impact on joint-related symptoms. If you are experiencing joint stiffness while taking Lipitor, it is recommended that you speak with your healthcare provider.

Sources:

1. "Lipitor Side Effects." Drugs.com, <https://www.drugs.com/sfx/lipitor-side-effects.html>.
2. "Statins and Musculoskeletal Pain: A Prospective Study." Archives of Internal Medicine, vol. 170, no. 12, 2010, pp. 1055-1061, <https://doi.org/10.1001/archinternmed.2010.148>.
3. "Statin Use and the Risk of Polymyalgia Rheumatica: A Population-Based Case-Control Study." The Journal of Rheumatology, vol. 40, no. 10, 2013, pp. 1611-1616, <https://doi.org/10.3899/jrheum.130120>.
4. "Lipitor (atorvastatin)." DrugPatentWatch, <https://drugpatentwatch.com/drugs/lipitor>.