After reviewing the sources provided, there is no direct evidence that Lipitor, also known as atorvastatin, affects the effectiveness of allergy medication.

Lipitor is a medication used to lower cholesterol levels and prevent cardiovascular disease [1]. However, it can cause side effects such as muscle pain, weakness, and gastrointestinal issues [2].

Allergy medication, on the other hand, is used to alleviate symptoms of allergies such as sneezing, runny nose, and itchy eyes. The type of allergy medication used varies, including antihistamines, decongestants, and nasal corticosteroids [3].

The third source provided discusses the interaction between atorvastatin and other medications. It states that atorvastatin can interact with drugs that are metabolized by the liver's cytochrome P450 enzyme system. This interaction can increase the risk of side effects or decrease the effectiveness of the medication [4]. However, allergy medication is not listed as a medication that interacts with atorvastatin.

In conclusion, there is no direct evidence to suggest that Lipitor affects the effectiveness of allergy medication. However, it is always important to consult with a healthcare provider before taking any new medications, including Lipitor and allergy medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/drugs-lipitor-side-effects
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7122736/
[4] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4396580/