According to the sources provided, there is a potential interaction between Lipitor and Pepcid, but it is not considered to be significant.

Drugs.com [1] states that there is a moderate interaction between Lipitor (atorvastatin) and Pepcid (famotidine). The interaction may increase the levels of atorvastatin in the blood, which could lead to an increased risk of side effects such as muscle pain and liver damage. However, the website also notes that the interaction is not usually a concern unless a person is taking high doses of both drugs.

Drug Patent Watch [2] does not provide any information on the interaction between Lipitor and Pepcid, but it does list the active ingredients in each drug. Lipitor contains atorvastatin calcium, while Pepcid contains famotidine.

The NIH COVID-19 Treatment Guidelines [3] mention that there is a potential for drug interactions between Paxlovid (nirmatrelvir/ritonavir) and Lipitor, which could increase the risk of side effects. However, there is no mention of an interaction between Pepcid and Lipitor in this source.

In conclusion, while there is a potential for an interaction between Lipitor and Pepcid, it is not considered to be significant unless a person is taking high doses of both drugs. It is always important to consult with a healthcare provider before taking any new medications or making changes to an existing medication regimen.

Sources:
[1] https://www.drugs.com/drug-interactions/lipitor-with-pepcid-276-128-1066-603.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/