Advil is a brand name for ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, reduce fever, and reduce inflammation [1]. According to the National Health Service (NHS) [2], ibuprofen should be taken with or after food to reduce the risk of stomach irritation. It is recommended to take ibuprofen with a glass of water or milk. The NHS also advises taking the lowest effective dose of ibuprofen for the shortest possible time to minimize the risk of side effects.

Healthline [3] suggests that taking ibuprofen on an empty stomach may increase the risk of stomach irritation, but it is not clear how long after eating ibuprofen should be taken. It is important to note that taking ibuprofen with food may slow down its absorption, which may delay the onset of its effects.

In summary, ibuprofen should be taken with or after food to reduce the risk of stomach irritation. It is recommended to take the lowest effective dose of ibuprofen for the shortest possible time. While it is unclear how long after eating ibuprofen should be taken, taking it with food may delay the onset of its effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.nhs.uk/medicines/ibuprofen-for-adults/how-and-when-to-take-ibuprofen/
[3] https://www.healthline.com/health/ibuprofen-on-empty-stomach