Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the body. According to Drug Patent Watch [1], there is no known interaction between Lipitor and antihistamines. However, it is important to note that Lipitor may interact with other medications, such as ritonavir-boosted nirmatrelvir (Paxlovid) [2]. It is recommended to consult with a healthcare provider before taking any new medications or changing the dosage of current medications, including antihistamines and Lipitor. The American Heart Association [3] suggests that individuals should inform their healthcare provider about all medications, supplements, and over-the-counter drugs they are taking to avoid potential interactions.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.covid19treatmentguidelines.nih.gov/therapies/antivirals-including-antibody-products/ritonavir-boosted-nirmatrelvir--paxlovid-/paxlovid-drug-drug-interactions/
[3] https://www.heart.org/en/health-topics/consumer-healthcare/medication-information/medication-interactions-food-supplements-and-other-drugs.