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Open Dose Calculator →Diphenhydramine
Diphenhydramine hydrochloride
💊 Used for: Allergic conditions, anaphylaxis, phenothiazine overdose (1-2 mg/kg IV slowly)
Formulation
Tablet
Standard tablet
Dose Range
5–5 mg/kg
Max Daily
N/A
Frequency
Every 6 hours
Max Single
400 mg
Route: Oral/IV
Dose by Child Weight
Based on formulation: Standard tablet
| Child's Weight | Dose (mg) | Dose (ml) | Max Daily Dose (mg) |
|---|---|---|---|
| 5 kg | 25–25 mg | 25.0–25.0 ml | — |
| 6 kg | 30–30 mg | 30.0–30.0 ml | — |
| 7 kg | 35–35 mg | 35.0–35.0 ml | — |
| 8 kg | 40–40 mg | 40.0–40.0 ml | — |
| 9 kg | 45–45 mg | 45.0–45.0 ml | — |
| 10 kg | 50–50 mg | 50.0–50.0 ml | — |
| 12 kg | 60–60 mg | 60.0–60.0 ml | — |
| 15 kg | 75–75 mg | 75.0–75.0 ml | — |
| 18 kg | 90–90 mg | 90.0–90.0 ml | — |
| 20 kg | 100–100 mg | 100.0–100.0 ml | — |
| 25 kg | 125–125 mg | 125.0–125.0 ml | — |
| 30 kg | 150–150 mg | 150.0–150.0 ml | — |
* Always verify with your doctor. doses are approximate and may vary based on condition and formulation.
⚠️ Important Warnings
- •C/I: With MAOIs, asthma, narrow angle glaucoma, urinary retention. Max 300 mg/24 hr.
💡 Use the DoseCare Calculator for interactive dose calculations tailored to your child's exact weight and formulation.
DoseCare is a decision support tool only. Always verify doses with a qualified healthcare provider.