Lipitor is a brand name for the medication atorvastatin, which is used to treat high cholesterol levels. According to Drug Patent Watch [1], there are no known interactions between atorvastatin and antihistamines. However, it is important to note that some antihistamines can cause drowsiness, which could be exacerbated by the use of atorvastatin.

Drugs.com [2] also states that there are no known interactions between allergy relief tablets and atorvastatin. However, it is important to consult with a healthcare provider before taking any new medications, including antihistamines and atorvastatin.

The COVID-19 Treatment Guidelines [3] provide information on the drug interactions of Paxlovid, which contains ritonavir-boosted nirmatrelvir. However, this information is not directly related to the interaction between atorvastatin and antihistamines.

In conclusion, based on the sources provided, there are no known interactions between atorvastatin (Lipitor) and antihistamines. However, it is important to consult with a healthcare provider before taking any new medications to ensure their safety and effectiveness.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.drugs.com/drug-interactions/allergy-relief-tablets-with-atorvastatin-1486-14544-276-0.html
[3] https://www.covid19treatmentguidelines.nih.gov/therapies/antivirals-including-antibody-products/ritonavir-boosted-nirmatrelvir--paxlovid-/paxlovid-drug-drug-interactions/