Advil is a brand name for ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain and reduce fever. While Advil is generally considered safe for children, there are potential side effects that parents should be aware of.

According to the NHS [3], common side effects of ibuprofen in children include stomach pain, indigestion, nausea, vomiting, and diarrhea. In rare cases, ibuprofen can cause serious side effects such as kidney damage, liver damage, and an allergic reaction.

A study published in the Journal of Pediatrics [2] found that ibuprofen use in children was associated with an increased risk of acute kidney injury (AKI), particularly in children with preexisting medical conditions. However, the overall risk of AKI was still relatively low, and the study authors noted that ibuprofen is still considered safe for most children.

Another potential concern with Advil use in children is the risk of Reye's syndrome, a rare but serious condition that can occur in children who take aspirin or other salicylate-containing medications during a viral illness. However, ibuprofen does not contain salicylates and is not associated with an increased risk of Reye's syndrome [3].

In summary, while Advil is generally considered safe for children, there are potential side effects that parents should be aware of. Common side effects include stomach upset, while rare but serious side effects include kidney and liver damage and an allergic reaction. Parents should always follow the recommended dosage instructions and talk to their doctor if they have any concerns about their child's use of Advil or other medications.

Sources:
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5529476/
[3] https://www.nhs.uk/medicines/ibuprofen-for-children/side-effects-of-ibuprofen-for-children/
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL