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A member asked:

My husband and i accidentally gave our 4 yr old son, who weighs 42lbs, a double dose of childrens benadryl (diphenhydramine) for his allergies (chewable tablets 12.5mg)?

A doctor has provided 1 answer

??no numbers??: The only way for me to comment on the dose is if you list what you gave. Two 12.5 mg tabs in a 42 lb kid might make him groggy but shouldn't hurt in the long run.Four tabs would put him to sleep and he'd be out for a few hours. Luckily the med clears the body in 4-8 hours.

Answered 11/14/2020

1.3k views

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