Advil is a brand name for the drug ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, reduce fever, and decrease inflammation. The active ingredient in Advil is ibuprofen, which is also found in generic versions of the drug. Generic drugs are required by the FDA to have the same active ingredients, strength, dosage form, and route of administration as their brand-name counterparts [2]. However, there may be differences in inactive ingredients, such as fillers and binders, which can affect how the drug is absorbed and metabolized in the body [3]. According to a report by CBS News, generic drugs are often less expensive than brand-name drugs, and are just as safe and effective [1]. It is important to note that while generic drugs are required to be equivalent to brand-name drugs, they may not always be identical, and some patients may have different reactions to different formulations of the same drug [2]. Ultimately, the decision to choose Advil or a generic version of ibuprofen may depend on personal preference, cost, and individual health factors.

Sources:
[1] https://www.cbsnews.com/news/generic-and-store-brands-vs-brand-names/
[2] https://www.theatlantic.com/health/archive/2015/03/generic-drugs-the-same-but-not/388592/
[3] https://www.drugpatentwatch.com/p/tradename/ADVIL