Lipitor is a brand name for atorvastatin, which is a medication used to lower cholesterol levels in the blood. According to Drugs.com [2], there are several over-the-counter (OTC) drugs that can interact with Lipitor. Some of these include:

- Aspirin: taking aspirin with Lipitor may increase the risk of bleeding.
- Nonsteroidal anti-inflammatory drugs (NSAIDs): such as ibuprofen and naproxen, can also increase the risk of bleeding when taken with Lipitor.
- Antacids: some antacids can decrease the absorption of Lipitor, so it is recommended to take Lipitor at least two hours before or after taking an antacid.
- Herbal supplements: certain herbal supplements such as St. John's wort and garlic may interact with Lipitor and increase the risk of side effects.

It is important to note that this is not a complete list of all possible drug interactions with Lipitor. Patients should always inform their healthcare provider of all medications and supplements they are taking before starting Lipitor.

Additionally, the COVID-19 Treatment Guidelines [3] warn that the antiviral medication Paxlovid, which contains ritonavir-boosted nirmatrelvir, may interact with Lipitor and increase the risk of side effects. Patients taking Lipitor should consult with their healthcare provider before starting any new medications, including OTC drugs and supplements.

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