Lipitor is a medication used to treat high cholesterol, while antihistamines are used to treat allergies. According to Drug Patent Watch [1], there is no known interaction between Lipitor and antihistamines. However, it is important to note that Lipitor may cause side effects such as nightmares and disturbing dreams [2]. A study published in the Journal of Pharmacy Practice and Research [3] suggests that some antihistamines may increase the risk of adverse effects when taken with statins, a class of drugs that includes Lipitor. However, the study did not specifically look at the interaction between Lipitor and antihistamines. It is always important to talk to a healthcare provider about any potential drug interactions or side effects before taking any new medications.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/drugs/side-effects/medications-that-cause-nightmares-and-disturbing-dreams
[3] https://pubmed.ncbi.nlm.nih.gov/30600956/