Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to the sources provided, there are no specific allergy medications that should be avoided when taking Lipitor. However, it is important to note that individuals with a history of a sulfa allergy should inform their healthcare provider before taking Lipitor, as it contains a sulfonamide moiety in its chemical structure [3]. It is also important to consult with a healthcare provider before taking any new medications, including allergy medications, while taking Lipitor, as there may be potential drug interactions [2]. Additionally, it is important to follow the dosage and administration instructions provided by the healthcare provider or on the medication label to ensure safe and effective use of Lipitor [2].

Sources:
[2] https://www.webmd.com/drugs/2/drug-3330/lipitor-oral/details
[3] https://www.mayoclinic.org/diseases-conditions/drug-allergy/expert-answers/sulfa-allergy/faq-20057970