Based on the sources provided, there is no direct information about whether allergy medications interfere with Lipitor's effectiveness. However, it is important to note that certain medications and substances can interact with Lipitor, potentially affecting its effectiveness or causing harmful side effects.

According to DrugPatentWatch [1], Lipitor's active ingredient is atorvastatin, which is a type of medication called a statin. Statins work by reducing the amount of cholesterol produced by the liver, which can help lower cholesterol levels in the blood. While there is no specific information about allergy medications interacting with Lipitor, there are several medications and substances that can interact with statins and affect their effectiveness or cause harmful side effects.

For example, the National Institute on Alcohol Abuse and Alcoholism [2] warns that mixing alcohol with statins like Lipitor can increase the risk of liver damage and other harmful side effects. Additionally, the COVID-19 Treatment Guidelines [3] note that ritonavir-boosted nirmatrelvir (Paxlovid), a medication used to treat COVID-19, can interact with Lipitor and increase the risk of side effects like muscle pain and weakness.

Overall, while there is no direct information about allergy medications interfering with Lipitor's effectiveness, it is important to talk to a healthcare provider about any medications or substances you are taking to ensure that they do not interact with Lipitor or cause harmful side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.niaaa.nih.gov/publications/brochures-and-fact-sheets/harmful-interactions-mixing-alcohol-with-medicines
[3] https://www.covid19treatmentguidelines.nih.gov/therapies/antivirals-including-antibody-products/ritonavir-boosted-nirmatrelvir--paxlovid-/paxlovid-drug-drug-interactions/