While Advil (ibuprofen) is a commonly used medication for pain relief and inflammation, it is essential to be aware of potential side effects. According to Drug Patent Watch, some common side effects of Advil include gastrointestinal issues like stomach pain, heartburn, and nausea. Additionally, GoodRx mentions that Advil may cause more severe side effects such as stomach ulcers, kidney problems, and allergic reactions. The Mayo Clinic also lists potential side effects of ibuprofen, the active ingredient in Advil, which can include gastrointestinal bleeding, high blood pressure, and liver damage. It is crucial to consult a healthcare professional if you experience any concerning side effects while taking Advil.

Sources:
[1] Drug Patent Watch. (n.d.). Advil Side Effects. Retrieved from https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] GoodRx. (n.d.). Advil Side Effects. Retrieved from https://www.goodrx.com/advil/advil-side-effects
[3] Mayo Clinic. (n.d.). Ibuprofen (Oral Route) - Side Effects. Retrieved from https://www.mayoclinic.org/drugs-supplements/ibuprofen-oral-route/side-effects/drg-20070602?p=1