According to the sources provided, there is a possibility of side effects when combining Advil (ibuprofen) and antibiotics.

Advil is a nonsteroidal anti-inflammatory drug (NSAID) that is used to relieve pain, reduce fever, and reduce inflammation [1]. It works by blocking the production of certain chemicals in the body that cause pain and inflammation.

Antibiotics, on the other hand, are used to treat bacterial infections [3]. They work by killing or stopping the growth of bacteria that cause infections.

When Advil and antibiotics are combined, there is a risk of decreased effectiveness of the antibiotics. This is because Advil can reduce blood flow to the kidneys, which can decrease the amount of antibiotics that are filtered through the kidneys and into the urine [2].

Additionally, combining Advil and certain antibiotics, such as ciprofloxacin and levofloxacin, can increase the risk of side effects such as stomach bleeding and ulcers [3].

It is important to talk to a healthcare provider before combining Advil and antibiotics. They can provide guidance on the appropriate use of these medications and any potential risks or side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/advil-safety/combining-medications/
[3] https://www.drugs.com/medical-answers/take-ibuprofen-antibiotics-3121711/