[heartwood]

Some children have a paradoxical reaction to Benadryl; they get hyper instead of sedated. Which is a good reason to do a trial before a flight.

I would be very hesitant to offer a parent medication for a child. What if there were an unknown allergy or adverse reaction?

[Blue Jays]

"...What if there were an unknown allergy or adverse reaction?..."

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In the words of famous athlete Ivan Drago, ”If he dies, he dies.”.