Benadryl (diphenhydramine) and Unisom (doxylamine succinate) are sleep aids that can be purchased over the counter. Both medications are antihistamines that have sedative side effects. Generic ...

like most over-the-counter sleep aids, contains diphenhydramine, an antihistamine that sedates some people. The problem with ...

Remember, talk to your doctor before you use a sleep aid. Diphenhydramine can also cause unwanted sleepiness in the morning, according to Susan Esther, MD, member of the board of directors of the ...

How it works: Diphenhydramine is a common ingredient in sleep aids and allergy medications, like Benadryl. It affects your H1 receptors, which are one of the most important receptors for ...