What are the side effects of a diphenhydramine overdose?

Benadryl (diphenhydramine) OD. Causes sleepiness, weakness, confusion, blurred vision, dry mouth, flushing, fever, shaking, hallucinations, and possibly seizures. If you suspect od get to an er!
Diphenhydramine O/D. sx's can include: Inability to urinate, Blurred vision, Dry mouth, Enlarged pupils, dry eyes, Ringing in ears, Low blood pressure, Rapid heart rate, Agitation, Confusion, Convulsions, Delirium, Depression, Drowsiness, Hallucinations, sleepiness, Nervousness, Tremor, Unsteadiness & Dry, red skin. An overdose warrants ER visit.