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Based on the information available, there is no definitive evidence to suggest that Lipitor (atorvastatin) commonly leads to muscle stiffness. Lipitor is a statin medication used to lower cholesterol levels, and while muscle-related side effects are possible with statins, muscle stiffness is not listed as a common side effect in the official Lipitor prescribing information [1].

However, it is important to note that muscle pain or weakness can occur in some individuals taking Lipitor or other statins. This side effect, known as myalgia, can range from mild to severe. In rare cases, a serious condition called rhabdomyolysis can develop, which is characterized by muscle breakdown and the release of muscle contents into the bloodstream [1].

If you experience muscle stiffness, pain, or weakness while taking Lipitor, it is essential to consult your healthcare provider. They can evaluate your symptoms and determine whether adjustments to your medication regimen are necessary.

In summary, while muscle stiffness is not a commonly reported side effect of Lipitor, muscle pain or weakness can occur. Consult your healthcare provider if you experience any muscle-related symptoms while taking Lipitor.

Sources:
[1] Lipitor (atorvastatin) tablets, for oral use. Full Prescribing Information. Pfizer Labs. January 2021. <https://www.accessdata.fda.gov/drugsatfda_docs/label/2021/020990s053lbl.pdf>
[2] DrugPatentWatch.com. Lipitor (atorvastatin) Patent Expiration and Generic Entry. <https://www.drugpatentwatch.com/patent/lipitor-atorvastatin/>