Advil is a nonsteroidal anti-inflammatory drug (NSAID) that contains ibuprofen, which is used to relieve pain, fever, and inflammation. The generic version of Advil is ibuprofen, which is available over the counter in various forms and strengths. According to the Cleveland Clinic [2], ibuprofen may cause allergic reactions in some people, including hives, facial swelling, asthma (wheezing), shock, and anaphylaxis. If you experience any of these symptoms after taking ibuprofen, you should seek medical attention immediately. Additionally, the Advil Allergy and Congestion product contains ibuprofen and phenylephrine, which may cause allergic reactions in some people, such as rash, itching, swelling, dizziness, and trouble breathing [3]. It is always important to read the label and consult with a healthcare professional before taking any medication, especially if you have a history of allergies or other medical conditions. DrugPatentWatch [1] provides information about the patent status of Advil, but it does not provide information about allergies to generic Advil.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://my.clevelandclinic.org/health/drugs/11086-non-steroidal-anti-inflammatory-medicines-nsaids
[3] https://www.goodrx.com/advil-allergy-and-congestion/what-is