Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], the most common side effects of Lipitor include headache, diarrhea, and muscle pain. However, it is unclear whether Lipitor can weaken muscle strength.

A study published in the Journal of Clinical Lipidology [2] found that while statins, including Lipitor, can cause muscle-related side effects such as myopathy and rhabdomyolysis, they do not appear to have a significant effect on muscle strength. The study concluded that "the risk of developing muscle-related symptoms is small and the risk of developing muscle weakness is even smaller."

However, some patients may still experience muscle pain or weakness while taking Lipitor. In such cases, Cleveland Clinic [3] suggests that patients should talk to their doctor about potentially adjusting the dosage or switching to a different statin medication. Additionally, the article suggests that patients should consider taking CoQ10 supplements, which may help alleviate muscle-related side effects.

In summary, while Lipitor may cause muscle-related side effects, including pain, it is unclear whether it can weaken muscle strength. Patients who experience muscle-related symptoms while taking Lipitor should talk to their doctor about potential solutions, including adjusting the dosage or switching to a different medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2949584/
[3] https://health.clevelandclinic.org/statins-giving-you-achy-muscles-ask-your-doctor-about-these-4-potential-fixes/