Dexamethasone Pediatric Dose Calculator
Calculate dexamethasone doses for children by weight and indication including croup, asthma, bacterial meningitis, and anti-emetic use.
Dexamethasone Pediatric Dose Calculator
Evidence-based weight-adjusted dosing
How to Use This Calculator
Enter Weight
Input the child's weight in kilograms for precise dose calculation.
Select Indication
Choose the clinical reason — croup, asthma, meningitis, anti-emetic, or airway edema.
Choose Formulation
Select the liquid concentration or tablet form you have available.
Review Dosing
View per-dose and daily amounts, dosing frequency, and clinical notes.
How We Calculate
Dexamethasone dosing in pediatrics follows well-established guidelines across multiple indications. For croup, the landmark Bjornson et al. study and subsequent AAP guidance recommend 0.6 mg/kg as a single oral dose (max 16 mg). For asthma, a 2-day dexamethasone course at 0.6 mg/kg/day has been shown equivalent to 5 days of prednisolone in multiple randomized trials.
Bacterial meningitis dosing follows the de Gans and van de Beek protocol: 0.15 mg/kg IV every 6 hours for 2–4 days, starting with or just before the first dose of antibiotics. This has demonstrated benefit primarily in Haemophilus influenzae meningitis and pneumococcal meningitis. Dexamethasone is approximately 25 times more potent than hydrocortisone and 6 times more potent than prednisolone.
All doses are automatically capped at standard maximum values. Clinicians should verify doses against current institutional protocols. This tool provides educational guidance and is not a substitute for clinical decision-making.
Sources & References
- Bjornson et al. — A Randomized Trial of Single Dose Oral Dexamethasone for Mild Croup, NEJM (nejm.org)
- de Gans & van de Beek — Dexamethasone in Adults with Bacterial Meningitis, NEJM (nejm.org)
- Lexicomp Pediatric Drug Information — Dexamethasone (wolterskluwer.com)
Data last verified:
Frequently Asked Questions
The standard dose for croup is 0.6 mg/kg given as a single oral dose, with a maximum of 16 mg. This can be given as the oral liquid or crushed tablets mixed with a sweet food. Most children show significant improvement within 2–4 hours. A second dose may be given after 24 hours if symptoms recur, though most children do not need a repeat dose.
Multiple randomized controlled trials have shown that 2 days of dexamethasone (0.6 mg/kg/day, max 16 mg) is equivalent to 5 days of prednisolone for acute asthma exacerbations in children. Dexamethasone offers improved compliance due to the shorter course and better taste. It also has a longer duration of action (36–72 hours vs 12–36 hours for prednisolone).
Dexamethasone should be given 15–20 minutes before or concurrently with the first dose of antibiotics in bacterial meningitis. Delayed initiation (after antibiotics) provides less benefit. The dose is 0.15 mg/kg every 6 hours for 2–4 days. Evidence supports its use primarily in H. influenzae type b and pneumococcal meningitis in children older than 6 weeks.
Short-term side effects include increased appetite, hyperactivity, irritability, and difficulty sleeping. Stomach upset and elevated blood sugar can occur. For single-dose use in croup, side effects are minimal. With multi-day courses, there is potential for immune suppression and adrenal axis effects, though these are unlikely with courses under 5 days.
Yes, dexamethasone oral liquid can be given to infants under physician supervision. The 1 mg/mL or 0.5 mg/mL concentrations allow accurate small-volume dosing for low-weight infants. For infants under 3 months, croup dosing should be approached with caution and other diagnoses considered, as croup is uncommon in this very young age group.
Dexamethasone is one of the most potent corticosteroids available. It is approximately 25 times more potent than hydrocortisone, 6 times more potent than prednisolone or prednisone, and 5 times more potent than methylprednisolone on a milligram-for-milligram basis. This high potency means much smaller doses are needed compared to other corticosteroids.
Yes, clinical evidence supports the 2-day course. Dexamethasone has a biological half-life of 36–72 hours, significantly longer than prednisolone (12–36 hours). This means that after 2 days of dosing, therapeutic anti-inflammatory effects persist for an additional 1–3 days. Multiple studies have shown no difference in relapse rates or ED return visits between 2-day dexamethasone and 5-day prednisolone.
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