Lipitor (atorvastatin) is a prescription drug used to lower cholesterol levels in the blood. According to the sources provided, Lipitor may interact with other over-the-counter (OTC) drugs.

Drugs.com [1] states that Lipitor may interact with several OTC drugs, including aspirin, ibuprofen, and naproxen. These drugs may increase the risk of side effects, such as bleeding, stomach ulcers, and kidney problems, when taken with Lipitor. Additionally, Lipitor may increase the blood levels of certain OTC drugs, such as dextromethorphan and pseudoephedrine, which may increase the risk of side effects.

Drug Patent Watch [2] provides information on the patents and exclusivities for Lipitor, but does not mention any drug interactions.

The NIH COVID-19 Treatment Guidelines [3] state that Lipitor may interact with ritonavir-boosted nirmatrelvir (Paxlovid), which is an antiviral drug used to treat COVID-19. The interaction may increase the blood levels of Lipitor, which may increase the risk of side effects.

In conclusion, Lipitor may interact with several OTC drugs, including aspirin, ibuprofen, and naproxen. Patients should talk to their healthcare provider before taking any OTC drugs while taking Lipitor. Additionally, Lipitor may interact with ritonavir-boosted nirmatrelvir (Paxlovid), which is used to treat COVID-19. Patients taking both drugs should be monitored closely for side effects.

Sources:
[1] https://www.drugs.com/drug-interactions/atorvastatin,lipitor.html
[2] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[3] https://www.covid19treatmentguidelines.nih.gov/therapies/antivirals-including-antibody-products/ritonavir-boosted-nirmatrelvir--paxlovid-/paxlovid-drug-drug-interactions/