Genitourinary side effects have included urinary retention and dysuria as a result of the anticholinergic effects of diphenhydramine.
So it is known to cause urinary retention but not really incontinence, however it may be an unknown side effect.
- Diphenhydramine Information for Consumers
- Diphenhydramine Information for Healthcare Professionals (includes dosage details)
- Side Effects of Diphenhydramine (detailed)
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