Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood. According to the sources provided, joint pain is a possible side effect of Lipitor.

Drugwatch [1] lists joint pain as one of the common side effects of Lipitor, affecting up to 5% of patients. Joint pain can manifest as discomfort, stiffness, or inflammation in the joints. The source also notes that joint pain can occur at any time during treatment, and may persist even after discontinuing the medication.

GoodRx [2] also mentions joint pain as a possible side effect of statins, including Lipitor. The source notes that joint pain may be more common in women and older adults, and that the risk of joint pain may increase with higher doses of the medication.

DrugPatentWatch [3] does not provide information on specific side effects of Lipitor, but rather focuses on the drug's patent status and availability.

In conclusion, joint pain is a known possible side effect of Lipitor, as noted by Drugwatch and GoodRx. Patients taking Lipitor should be aware of this potential side effect and discuss any concerns with their healthcare provider.

Sources:
[1] https://www.drugwatch.com/lipitor/side-effects/
[2] https://www.goodrx.com/classes/statins/joint-pain
[3] https://www.drugpatentwatch.com/p/tradename/LIPITOR