Lipitor, also known as atorvastatin, is a medication that is used to treat high cholesterol levels in the body [3]. It works by blocking an enzyme that produces cholesterol in the liver, thereby reducing the amount of cholesterol in the bloodstream [2]. According to Drug Patent Watch [1], Lipitor has been available in the United States since 1996 and has been prescribed to millions of patients worldwide.

While Lipitor is generally considered safe and effective, like any medication, it may cause side effects. The Mayo Clinic [2] lists several possible side effects of Lipitor, including muscle pain, weakness, and tenderness. However, the Mayo Clinic notes that these side effects are rare and typically resolve on their own within a few weeks.

As for whether Lipitor affects the effectiveness of pain medications, there is no clear answer. The sources provided do not suggest that Lipitor has a significant impact on pain medication effectiveness. However, it is always important to talk to a healthcare provider about any medications you are taking and to discuss any potential interactions or side effects.

In summary, Lipitor is a medication used to treat high cholesterol levels and is generally considered safe and effective. While it may cause side effects such as muscle pain, there is no evidence to suggest that it affects the effectiveness of pain medications. As always, it is important to talk to a healthcare provider about any medications you are taking and to discuss any potential interactions or side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013
[3] https://www.medicalnewstoday.com/articles/lipitor