Although I didn't find a direct reference to nosebleeds, this drug is an antihistamine, which dries out a person's mouth and nasal passages and other mucous membranes. That means when a person goes to blow their nose they can have a nosebleed. If they have a vein or capillary very near the inner surface of the nose, the nosebleed can be spontaneous.
- Diphenhydramine Information for Consumers
- Diphenhydramine Information for Healthcare Professionals (includes dosage details)
- Side Effects of Diphenhydramine (detailed)
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