Based on the information available, it is recommended to consult with a healthcare professional before combining Lipitor and prescribed allergy medication. Lipitor, a medication used to treat high cholesterol, can interact with other medications, potentially causing adverse effects [1].

Allergy medications, such as antihistamines, decongestants, and leukotriene modifiers, can interact with Lipitor, leading to increased risk of muscle damage, kidney damage, or irregular heartbeat [1][2]. The severity of these interactions can vary depending on the specific allergy medication and the individual's health status.

It is important to note that drug interactions can occur even if the medications are taken at different times of the day [1]. Therefore, it is crucial to inform healthcare professionals about all medications being taken, including over-the-counter drugs and supplements.

In summary, while it may not be inherently unsafe to combine Lipitor and prescribed allergy medication, it is crucial to consult with a healthcare professional before doing so to ensure safety and effectiveness [1][2].

Sources:
[1] Drugs.com. (2021). Atorvastatin (Oral Route) Interactions. Retrieved from <https://www.drugs.com/drug-interactions/atorvastatin-oral-route-with-atorvastatin-oral-route.html>
[2] DrugPatentWatch.com. (2021). Lipitor. Retrieved from <https://www.drugpatentwatch.com/drugs/lipitor>