Lipitor is a medication used to lower cholesterol levels in the body [1]. According to the sources provided, there is no indication that Lipitor would affect the effectiveness of allergy medication. However, it is important to consult with a healthcare provider before taking any new medication, including Lipitor, to ensure that it is safe to use in combination with other medications and to discuss any potential side effects or interactions [2][3].

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