I would start by gathering information by callling the Poison Help line at 1-800-222-1222. Also speak to a Pharmacist, and explain the situation and get his / her feedback, and with all that information try to help your friend (the more you know the better off you will be) by explaining what could happened if he/ she keeps on taking that many pills a day.
Symptoms of a diphenhydramine overdose include extreme sleepiness, confusion, weakness, ringing in the ears, blurred vision, large pupils, dry mouth, flushing, fever, shaking, insomnia, hallucinations, and possibly seizures.
- Diphenhydramine Information for Consumers
- Diphenhydramine Information for Healthcare Professionals (includes dosage details)
- Side Effects of Diphenhydramine (detailed)
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