Side effects of benadryl (diphenhydramine)?

Dried up and sleepy: Why would you want to take benadry (the brand name for diphenhydramine) long term? Fagetaboutit. Side effects are drying of mucous membrane, drowsiness, fatigue, difficulty urinating...

Most common side: Effects of Diphenhydramine are drowsiness, dry mouth, constipation, blurry vision, thickenened secretions, impaired coordination. There is a big laundry list of the usual anti choline this side effects, but those are the most common. People use it to sleep or for itching most often.