Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to Drugs.com [2], there are several over-the-counter drugs that can interact with atorvastatin, including herbal supplements, vitamins, and antacids. Some of these interactions can decrease the effectiveness of atorvastatin, while others can increase the risk of side effects.

For example, taking atorvastatin with certain antacids, such as aluminum and magnesium hydroxide, can reduce the absorption of atorvastatin in the body. Additionally, some herbal supplements, such as St. John's wort, can increase the metabolism of atorvastatin, leading to decreased effectiveness.

Another source, Drug Patent Watch [1], confirms that atorvastatin can interact with other drugs, including prescription medications. For example, the antiviral medication ritonavir can increase the levels of atorvastatin in the blood, which can increase the risk of side effects.

It is important to talk to a healthcare provider before taking any over-the-counter drugs or supplements while on atorvastatin. The provider can review all medications and supplements being taken and provide guidance on potential interactions.

In conclusion, there are over-the-counter drugs that can interact with atorvastatin, and it is important to consult with a healthcare provider before taking any of them. Patients should also be aware of the potential interactions between atorvastatin and prescription medications, such as ritonavir.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[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/