Advil is a brand name for the nonsteroidal anti-inflammatory drug (NSAID) ibuprofen. Ibuprofen is commonly used to treat pain, fever, and inflammation. According to Drugs.com [2], ibuprofen can be taken on an empty stomach, but it may cause stomach upset or irritation. Therefore, it is recommended to take ibuprofen with food or milk to reduce the risk of stomach upset. Healthline [3] also suggests that taking ibuprofen with food or milk can help reduce stomach irritation. However, the Drug Patent Watch [1] does not provide any information regarding the administration of Advil on an empty stomach.

In summary, while ibuprofen can be taken on an empty stomach, it is recommended to take it with food or milk to reduce the risk of stomach upset or irritation. It is important to follow the instructions on the label or as directed by a healthcare professional. If you experience severe stomach pain, black or bloody stools, or vomit that looks like coffee grounds, seek medical attention immediately.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.drugs.com/medical-answers/you-ibuprofen-empty-stomach-3572019/
[3] https://www.healthline.com/health/ibuprofen-on-empty-stomach