Advil is a brand name for the drug ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain, fever, and inflammation [1]. Children's medication usually refers to over-the-counter medications that are specifically formulated for children, such as Children's Tylenol or Children's Motrin.

According to the Advil website, it is generally safe to combine Advil with other medications, including children's medications, as long as the dosages are appropriate and the medications do not contain the same active ingredient [2]. However, it is always important to check with a healthcare provider before combining medications, especially if the person taking the medications has any underlying medical conditions or is taking prescription medications.

A study published in the Journal of Pediatric Pharmacology and Therapeutics found that combining ibuprofen with acetaminophen (the active ingredient in Tylenol) can be an effective way to manage pain in children, but caution should be taken to ensure that the dosages are appropriate and the medications are not given too frequently [3]. The study also noted that while the combination of ibuprofen and acetaminophen is generally safe, there is a risk of overdose if the medications are not used as directed.

Overall, while it is generally safe to combine Advil with children's medication, it is important to check with a healthcare provider before doing so, especially if the person taking the medications has any underlying medical conditions or is taking prescription medications. It is also important to follow dosing instructions carefully and avoid taking more than the recommended amount of either medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/advil-safety/combining-medications/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6532735/