Benadryl can cause certain side effects, some of which are more common than others. These side effects may be temporary, lasting a few days to weeks. However, if the side effects last longer than that ...

Benadryl (diphenhydramine) is an over-the-counter (OTC) antihistamine that is commonly used to treat allergy symptoms, like sneezing, itching, and hives (rashes), motion sickness, and even difficulty ...