Lipitor is a brand name for the generic drug atorvastatin, which is used to lower cholesterol levels in the blood [1]. According to the drug information provided by WebMD, there are no known interactions between Lipitor and allergy medications [2]. However, it is important to note that certain allergy medications, such as antihistamines, can cause drowsiness or dizziness, which can be exacerbated by the use of Lipitor [2]. Patients should always consult with their healthcare provider before taking any new medications, including allergy medications, while taking Lipitor [2].

While Lipitor is generally considered safe and effective, it can cause side effects in some patients. The most common side effects of Lipitor include muscle and joint pain, nausea, diarrhea, and constipation [3]. Rare but serious side effects include liver damage, muscle damage, and an increased risk of diabetes [3]. Patients should seek medical attention immediately if they experience any symptoms of liver or muscle damage, such as dark urine, yellowing of the skin or eyes, or unexplained muscle pain or weakness [3].

In summary, there are no known interactions between Lipitor and allergy medications, but patients should always consult with their healthcare provider before taking any new medications while taking Lipitor. Lipitor can cause side effects in some patients, including muscle and joint pain, nausea, diarrhea, and constipation, as well as rare but serious side effects such as liver damage, muscle damage, and an increased risk of diabetes. Patients should seek medical attention immediately if they experience any symptoms of liver or muscle damage.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.webmd.com/drugs/2/drug-3330/lipitor-oral/details
[3] https://www.medicalnewstoday.com/articles/drugs-lipitor-side-effects