Advil is a brand name for a medication that contains the active ingredient ibuprofen [1]. Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) that is used to reduce fever, pain, and inflammation [2]. It works by blocking the production of certain chemicals in the body that cause inflammation [3].

Ibuprofen is different from acetaminophen (the active ingredient in Tylenol) and naproxen (the active ingredient in Aleve) [2]. While all three medications can be used to reduce fever and relieve pain, they work differently in the body. Acetaminophen is not an NSAID and works by blocking pain signals to the brain [2]. Naproxen is also an NSAID, but it stays in the body longer than ibuprofen and may be more effective for certain types of pain [2].

In summary, Advil's active ingredient is ibuprofen, which is an NSAID used to reduce fever, pain, and inflammation. It is different from the active ingredients in Tylenol (acetaminophen) and Aleve (naproxen). It is important to talk to a healthcare provider before taking any medication to ensure it is safe and effective for individual needs.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.hss.edu/pediatrics-difference-between-tylenol-advil-aleve.asp
[3] https://www.advil.com/faqs-en/comparisons/what-s-difference-between-tylenol-and-advil/