According to the sources provided, there are some potential interactions between Lipitor (atorvastatin) and antihistamines, but it is generally safe to take them together. The NHS website [2] notes that there are no known interactions between atorvastatin and antihistamines, but it is always important to consult with a doctor or pharmacist before taking any new medications. The Drugs.com website [3] lists a potential interaction between Lipitor and allergy relief tablets, which may increase the risk of side effects such as dizziness, drowsiness, and difficulty concentrating. However, this interaction is not considered to be serious, and most people can safely take these medications together. It is important to note that the specific antihistamine being taken may also affect the potential for interaction with Lipitor. Overall, while there may be some potential for interaction between Lipitor and antihistamines, it is generally considered safe to take them together as long as a healthcare provider is consulted and any potential side effects are monitored.

Sources:
[2] https://www.nhs.uk/medicines/atorvastatin/taking-atorvastatin-with-other-medicines-and-herbal-supplements/
[3] https://www.drugs.com/drug-interactions/allergy-relief-tablets-with-atorvastatin-1486-14544-276-0.html