Based on the information available, there can be potential side effects when taking Lipitor and allergy medication simultaneously. However, it's important to note that everyone's reaction to medications is different, and these side effects may not affect everyone.

Lipitor, also known as atorvastatin, is a statin medication used to treat high cholesterol levels [1]. Common side effects of Lipitor include muscle pain, liver damage, and increased blood sugar levels [1].

Allergy medications, on the other hand, can cause drowsiness, dizziness, and dry mouth [2].

When combining Lipitor and allergy medication, there may be an increased risk of side effects, particularly muscle pain and weakness, as both medications can cause these symptoms independently [1][2]. Additionally, there may be an increased risk of liver damage due to the combined effect of both medications on the liver [1][2].

It's important to consult with a healthcare provider before combining any medications, including Lipitor and allergy medication, to ensure safety and to monitor for potential side effects [1][2].

In summary, while there can be potential side effects from taking Lipitor and allergy medication together, it's important to consult with a healthcare provider before combining any medications.

Sources:
[1] DrugPatentWatch.com, "Lipitor (Atorvastatin) Drug Profile", <https://www.drugpatentwatch.com/drugs/lipitor>.
[2] Mayo Clinic, "Allergy Medications: Understanding Your OTC Options", <https://www.mayoclinic.org/diseases-conditions/allergies/in-depth/allergy-medications/art-20044450>.