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Benadryl / Diphenhydramine Side Effects

Bipolar Medications Library

By , About.com Guide

Updated June 20, 2006

About.com Health's Disease and Condition content is reviewed by the Medical Review Board

Note: Some medications related to Diphenhydramine are mentioned below.

Common Side Effects:

Check with your doctor if any of the following side effects continue or are bothersome:

Drowsiness; thickening of mucus

Less Common or Rare Side Effects:

Check with your doctor if any of the following side effects continue or are bothersome:

Blurred vision or any change in vision; confusion; difficult or painful urination; dizziness; dryness of mouth, nose, or throat; fast heartbeat; increased sensitivity of skin to sun; increased sweating; loss of appetite; nightmares; ringing or buzzing in ears; skin rash; stomach upset or stomach pain (more common with pyrilamine and tripelennamine); unusual excitement, nervousness, restlessness, or irritability

Always Notify Doctor:

Less Common or Rare: Sore throat and fever; unusual bleeding or bruising; unusual tiredness or weakness

Overdose Effects - Notify Doctor:

Clumsiness or unsteadiness; convulsions (seizures); drowsiness (severe); dryness of mouth, nose, or throat (severe); feeling faint; flushing or redness of face; hallucinations (seeing, hearing, or feeling things that are not there); shortness of breath or troubled breathing; trouble in sleeping

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.

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