About diphenhyd ramine hcl
First-generation antihistamine
Used for
- Temporarily relieves allergy symptoms such as sneezing, runny nose, and itchy, watery eyes.
- May relieve cough associated with minor throat or airway irritation.
Usual adult dose
For adults, diphenhydramine is commonly taken as 25–50 mg every 4–6 hours; follow the product label because this syrup may contain other ingredients.
Usual dose in children
For children aged 6–11 years, commonly 12.5–25 mg every 4–6 hours; do not use in children under 6 unless directed by a clinician. Follow the product label.
Common side effects
- Drowsiness
- Dizziness and impaired coordination
- Dry mouth, nose, or throat
- Blurred vision or constipation
Important warnings
- Can cause marked sleepiness; avoid driving and alcohol.
- Use caution with glaucoma, enlarged prostate, breathing problems, or older age.
- Do not combine with other diphenhydramine products or sedating medicines without professional guidance.
- Check the full label: expectorant syrups may contain additional active ingredients.
Pregnancy
Use only after discussing with a healthcare professional; pregnancy safety depends on circumstances and other syrup ingredients.
Breastfeeding
Diphenhydramine may cause infant sleepiness or irritability and may affect milk supply; seek professional guidance, especially with repeated use.
Interactions
- Alcohol, opioids, sleep medicines, and other sedatives can increase drowsiness.
- Monoamine oxidase inhibitors may intensify anticholinergic effects.
- Other medicines with diphenhydramine increase overdose and side-effect risk.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.