Why? It’s marketed for that age and is in wide use.

https://www.drugs.com/monograph/diphenhydramine.html

Right - but the kid was two, and the presumably within the dosage recommendations given by both the manufacturer and the FDA.

I was specifically responding to the claim that administering Benadryl to a two-year-old was “insane” and “dangerous and irresponsible”.

Once when my daughter was 2 years old she needed an MRI. She was given Benadryl beforehand on the advice of the doctor to allow her to sleep through the procedure.

why is it dangerous?