... alertness & no sleep
Yes, some people have this kind of reaction to some antihistamines where it makes them restless and more alert. It is called a "paradoxical reaction" because it stimulated rather than sedating but some people have this happen. It happens most in children and elderly but it can happen for anyone.
- Diphenhydramine Information for Consumers
- Diphenhydramine Information for Healthcare Professionals (includes dosage details)
- Side Effects of Diphenhydramine (detailed)
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