Advil is a brand name for the drug ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, fever, and inflammation. According to the official Advil website [3], it is recommended to take Advil with food or milk to reduce the risk of stomach irritation. Ibuprofen can irritate the stomach lining, leading to symptoms such as nausea, vomiting, and stomach pain. Taking Advil with food or milk can help to protect the stomach lining and reduce the risk of these side effects. However, Healthline [2] suggests that taking Advil on an empty stomach may help the drug to be absorbed more quickly, leading to faster pain relief. Despite this, it is still recommended to take Advil with food or milk to reduce the risk of stomach irritation. Additionally, the drug patent watch [1] website notes that Advil is available in several different forms, including tablets, capsules, and liquid gels. The recommended dosage and administration instructions may vary depending on the specific form of the drug. In summary, taking Advil with food or milk can help to protect the stomach lining and reduce the risk of stomach irritation, although taking it on an empty stomach may lead to faster pain relief.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.healthline.com/health/ibuprofen-on-empty-stomach
[3] https://www.advil.com/faqs-en/advil-pain/