Lipitor (atorvastatin) is a prescription medication used to lower cholesterol levels in the blood, while antihistamines are used to treat allergy symptoms. The question is whether there are any adverse effects of combining Lipitor with antihistamines.

According to the National Health Service (NHS) [2], there are no known interactions between atorvastatin and antihistamines. However, the NHS advises that patients should always check with their doctor or pharmacist before taking any new medication or supplement alongside atorvastatin.

BuzzRX [3] warns against taking Lipitor with Benadryl (diphenhydramine), an antihistamine, as it may increase the risk of side effects such as dizziness, drowsiness, and difficulty concentrating. However, BuzzRX does not provide any scientific evidence to support this claim.

Drug Patent Watch [1] provides information on the patent status of Lipitor but does not provide any information on the potential interactions between Lipitor and antihistamines.

In conclusion, according to the sources provided, there are no known adverse effects of combining Lipitor with antihistamines, but patients should always check with their doctor or pharmacist before taking any new medication or supplement alongside atorvastatin. BuzzRX warns against taking Lipitor with Benadryl, but this claim is not supported by scientific evidence.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/taking-atorvastatin-with-other-medicines-and-herbal-supplements/
[3] https://www.buzzrx.com/blog/medications-that-should-never-be-combined-with-benadryl