There is no information available in the provided sources about how long someone should wait to take Lipitor after allergy medication. However, the sources do provide information about potential drug interactions with Paxlovid, an antiviral medication used to treat COVID-19. According to the COVID-19 Treatment Guidelines published by the National Institutes of Health [2], Paxlovid can interact with Lipitor and increase the risk of side effects. Therefore, it is recommended that patients taking Lipitor should inform their healthcare provider before starting Paxlovid. The healthcare provider can monitor the patient for potential side effects and adjust the dosage of Lipitor if necessary. Additionally, patients taking Lipitor should inform their healthcare provider about any other medications or supplements they are taking to avoid potential drug interactions.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.covid19treatmentguidelines.nih.gov/therapies/antivirals-including-antibody-products/ritonavir-boosted-nirmatrelvir--paxlovid-/paxlovid-drug-drug-interactions/
[3] https://www.yalemedicine.org/news/13-things-to-know-paxlovid-covid-19