Medically reviewed by Daniel Combs, MD Benadryl (diphenhydramine) is an over-the-counter (OTC) antihistamine commonly used to ...

That’s not uncommon, as ships normally have a very limited supply of over-the-counter medicine for sale. The woman in the video above was able to find a Benadryl from another passenger.

Last month, the U.S. Food and Drug Administration proposed removing phenylephrine -- an active ingredient in hundreds of over-the-counter medications, including some versions of Tylenol, Benadryl ...