Medically reviewed by Daniel Combs, MD Benadryl (diphenhydramine) is an over-the-counter (OTC) antihistamine commonly used to treat allergies that is also sometimes used as a sleep aid for insomnia.

The agency proposed on Thursday discontinuing the use of phenylephrine - an ingredient in common medications like Vicks Sinex ...

However, they are also frequently combined with other ingredients like decongestants, which can hurt your dog. Always consult with a vet before giving your dog any new medication. Benadryl can ...