What are the effects of diphenhydramine od?

Dangerous Effects: Although death by Diphenhydramine overdose is uncommon, dangers associated with an overdose include cardiac arrhythmias, delirium, respiratory suppression, short-term memory loss, and urinary retention. If you suspect Diphenhydramine overdose, contact emergency services (911). There is an antidote that can be administered by medical professionals in the emergency room.

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. REF: https://medlineplus.gov/ency/article/002634.htm