Lipitor is a medication that is used to lower cholesterol levels in the body [1]. It works by blocking an enzyme that is responsible for producing cholesterol in the liver. Lipitor is not known to affect the effectiveness of allergy medicine directly. However, it is important to note that Lipitor can cause side effects that may interfere with the effectiveness of allergy medicine.

According to WebMD [2], Lipitor can cause side effects such as headache, dizziness, and nausea. These side effects can make it difficult for some people to take their allergy medicine as directed. For example, if someone experiences nausea after taking Lipitor, they may be less likely to take their allergy medicine with food, which could reduce its effectiveness.

Additionally, Medical News Today [3] notes that Lipitor can interact with other medications, including some allergy medicines. For example, taking Lipitor with certain antihistamines can increase the risk of side effects such as drowsiness and dizziness. It is important to speak with a healthcare provider about any medications you are taking, including allergy medicine, to ensure that there are no potential interactions.

In summary, Lipitor is not known to directly affect the effectiveness of allergy medicine. However, its side effects and potential interactions with other medications, including allergy medicine, should be taken into consideration. It is important to speak with a healthcare provider about any concerns or questions regarding medication use.

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