Unfortunately, the sources provided do not contain information about a current Advil promotion or when it might end. The first source is a drug patent database that provides information on the active ingredient in Advil, but does not provide information on promotions or marketing campaigns. The second source is the official Advil website, which does not currently have any information about promotions or discounts. The third source is a medical research article about the use of ibuprofen (the active ingredient in Advil) for pain relief, but it does not provide information on promotions or marketing campaigns either.

It is recommended to check with the manufacturer or retailer directly for any information on current promotions or discounts for Advil. Alternatively, you can check with local stores or pharmacies that carry Advil to see if they have any ongoing promotions.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6494203/