Lipitor is a brand name for the drug atorvastatin, which is a type of medication called a statin that is used to lower cholesterol levels in the blood. Antihistamines are a class of drugs used to treat allergies, and they work by blocking the effects of histamine in the body.

According to Drug Patent Watch [1], there are no known interactions between Lipitor and antihistamines. However, it is important to note that every person's body is different, and there is always a possibility of side effects when taking any medication.

Common side effects of Lipitor include muscle pain, weakness, and tenderness, as well as stomach pain, nausea, and diarrhea [2]. Less common but more serious side effects can include liver damage, memory loss, and an increased risk of developing type 2 diabetes [2].

Antihistamines can also cause side effects, such as drowsiness, dry mouth, and dizziness [3]. Some antihistamines can also interact with other medications, so it is important to talk to a doctor or pharmacist before taking them with any other drugs [3].

In summary, there are no known interactions between Lipitor and antihistamines, but it is always important to be aware of the potential side effects of any medication. It is recommended to talk to a doctor or pharmacist before taking any new medications or combining medications.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://abcnews.go.com/Health/HeartDiseaseLivingWith/story?id=4224807
[3] https://www.verywellhealth.com/statin-side-effects-and-drug-interactions-698202