It is not safe to mix Advil (ibuprofen) with alcohol as it can increase the risk of stomach bleeding and other complications. According to Drug Patent Watch [1], Advil is a nonsteroidal anti-inflammatory drug (NSAID) that works by reducing hormones that cause inflammation and pain in the body. Mixing Advil with alcohol can increase the risk of gastrointestinal bleeding, ulcers, and stomach irritation. GoodRx [2] also warns that alcohol can increase the risk of stomach bleeding and other side effects of NSAIDs. Healthline [3] advises that if you do choose to drink alcohol while taking Advil, you should limit your alcohol intake and take the medication with food or milk to reduce the risk of stomach irritation. However, it is best to avoid mixing Advil with alcohol altogether to prevent any potential complications. It is always recommended to consult with a healthcare provider before taking any medication or mixing it with alcohol.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.goodrx.com/classes/nsaids/mixing-with-alcohol
[3] https://www.healthline.com/health/pain-relief/ibuprofen-alcohol