Lipitor is a brand name for atorvastatin, which is a medication used to lower cholesterol levels in the blood [3]. According to the sources provided, there is no evidence that Lipitor can interfere with pain medication absorption.

However, it is important to note that certain medications can interact with each other and affect their effectiveness or increase the risk of side effects. For example, some medications can interact with grapefruit juice, which can increase the level of the medication in the blood and lead to adverse effects [3].

Additionally, some medications can interact with dietary supplements, such as fiber supplements. According to Harvard Health Publishing, fiber supplements can interfere with the absorption of certain medications, including some cholesterol-lowering medications [2].

Therefore, it is important to talk to a healthcare provider or pharmacist about all the medications and supplements a person is taking to ensure that there are no potential interactions or adverse effects.

Sources:
[1] DrugPatentWatch. Lipitor. https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] Harvard Health Publishing. Will a fiber supplement interfere with my medications? https://www.health.harvard.edu/newsletter_article/will-a-fiber-supplement-interfere-with-my-medications
[3] Mayo Clinic. Cholesterol medications: Consider the options. https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/cholesterol-medications/art-20050958