Pediatric Weight-Based Dose Calculator
Calculates exact single-dose and 24-hour liquid medication volumes (mL) with automatic adult maximum safety capping.
1. Patient Weight & Drug Preset
💡 Clinical Guidance: AAP 2024 First-Line for suspected resistant Streptococcus pneumoniae
2. Dosing & Concentration Setup
🥄 Measure 6.8 mL using an oral calibrated syringe (do not use household kitchen spoons).
Space doses evenly throughout waking hours or round-the-clock for severe bacterial infections.
Standard range: 90 mg/kg for Acute Otitis Media, Community-Acquired Pneumonia.
- Always shake oral suspensions vigorously before measuring each dose.
- Always use the calibrated oral syringe provided with the bottle; household spoons vary between 2.5 mL and 9 mL.
- Discard reconstituted antibiotic suspensions after 10–14 days per manufacturer storage guidelines.
Principles of Pediatric Weight-Based Drug Administration
Pediatric pharmacology requires extreme precision. Because children undergo dramatic maturation of metabolic and renal pathways, all medications are titrated against actual body weight ($mg/kg$) rather than chronological age. Liquid formulations further require precise conversion to milliliters ($mL$) using the bottle's specified active ingredient concentration.
Adult Ceiling Cap
As children approach adolescence, weight-based calculations often exceed adult doses. The calculated pediatric dose must always be capped at the standard adult maximum (e.g. 1,000 mg single dose for Amoxicillin).
Per-Day vs. Per-Dose
A common fatal error is prescribing total daily requirements as an individual single dose (e.g. giving 90 mg/kg in one administration instead of dividing it into two 45 mg/kg doses every 12 hours).
Calibrated Oral Syringes
Household teaspoons vary between 2.5 mL and 9.0 mL. The AAP strongly advises parents and clinical staff to administer oral suspensions strictly via marked oral syringes or calibrated dosing cups.
Standard Pediatric Dosing Guidelines (AAP / BNFc 2024)
| Medication | Standard Dosing | Frequency | Common Formulations | Max Adult Cap |
|---|---|---|---|---|
| Amoxicillin (High-Dose) | 80 – 90 mg/kg/day | Divided Q12H (BID) | 400 mg / 5 mL, 250 mg / 5 mL | 1,000 mg / dose |
| Amoxicillin (Standard) | 40 – 45 mg/kg/day | Divided Q12H (BID) | 125 mg / 5 mL, 250 mg / 5 mL | 500 mg / dose |
| Paracetamol (Acetaminophen) | 10 – 15 mg/kg/dose | Every 4–6 hrs (Max 5x/day) | 120 mg / 5 mL, 250 mg / 5 mL, 100 mg / 1 mL | 1,000 mg / dose (Max 4,000 mg/day) |
| Ibuprofen (≥ 6 months) | 5 – 10 mg/kg/dose | Every 6–8 hrs (TID) | 100 mg / 5 mL | 400 mg / dose (Max 2,400 mg/day) |
| Cefixime | 8 mg/kg/day | Once daily or divided Q12H | 100 mg / 5 mL | 400 mg / day |
| Azithromycin | 10 mg/kg Day 1, 5 mg/kg D2-5 | Once daily (QD) | 200 mg / 5 mL | 500 mg Day 1, 250 mg D2-5 |
Frequently Asked Questions (Clinical FAQs)
How should you handle medication dosing if an accurate scale is unavailable?
In acute emergency or remote settings without a weighing scale, the Advanced Pediatric Life Support (APLS) formula provides an estimate:
• Age 1–5 years: Weight (kg) = (Age in years + 4) × 2
• Age 6–12 years: Weight (kg) = Age in years × 3
However, actual measured weight on a calibrated digital pediatric scale must always be obtained as soon as possible.
Why is Ibuprofen contraindicated in infants under 6 months?
Infants under 6 months have immature glomerular filtration and decreased renal prostaglandin synthesis. NSAIDs like Ibuprofen can cause acute kidney injury (prerenal azotemia) and gastric mucosal ulceration. Paracetamol (Acetaminophen) remains the antipyretic of choice for infants under 6 months.
What is the difference between Amoxicillin standard dose vs high dose?
High-dose Amoxicillin (80–90 mg/kg/day) is recommended by the AAP for acute otitis media and pneumonia in areas with high prevalence of penicillin-resistant Streptococcus pneumoniae, daycare attendees, or children treated with antibiotics in the prior 30 days. Standard-dose (40–45 mg/kg/day) is reserved for uncomplicated mild streptococcal pharyngitis.