6 mo old son has bad allergies, his doctor said to use benadryl (diphenhydramine) but on the bottle it literally says "do not use in children under 2" idk who to trust?

It's weight based: Like most medications for children, the dose of Benadryl (diphenhydramine) is weight based. I've selectively advised parents to give children under 2 y/o Benadryl (diphenhydramine) over the years. The label says that because children under 2 yrs are "higher risk" patients who may be more susceptible to side effects of medications, & the manufacturers don't want parents giving these medications to kids w/o a doctors recommendation.

You're kidding right: The drug companies place warning labels on OTC meds to push parents into consulting their doc for guidance. When adjusted for the weight of the child it is safe and has been used for infants for more than 50 years.

Trust doctor: The manufacturer buts the warning on so parents do not use it unless directed by a doctor who will adjust the dosage for the age and size of the child.