Diclofenac Injection Dose for 14-Year-Old Girl, 39 kg
For a 14-year-old girl weighing 39 kg, the appropriate intravenous diclofenac sodium injection dose is 0.5-1 mg/kg every 8 hours, which translates to 19.5-39 mg per dose (typically rounded to 20-40 mg). 1
Dosing Recommendations
The most recent pediatric anesthesia guideline (2024) from the European Society for Paediatric Anaesthesiology provides clear weight-based dosing for diclofenac across different routes 1:
Intravenous Route
- Dose: Not specifically listed for IV diclofenac in the guideline table, but other IV NSAIDs are provided as alternatives (ketorolac, ketoprofen, ibuprofen)
- The guideline focuses on oral and rectal routes for diclofenac specifically
Oral Route (if applicable)
- Dose: 1 mg/kg every 8 hours 1
- For this patient: 39 mg every 8 hours
Rectal Route (if applicable)
- Dose: 0.5-1 mg/kg every 8 hours 1
- For this patient: 19.5-39 mg every 8 hours
Important Clinical Context
The evidence strongly supports using the lower end of the dosing range initially. Pharmacokinetic research demonstrates that 0.5 mg/kg IV provides effective analgesia in children aged 1-12 years 2, 3. A study specifically examining IV diclofenac in children aged 4-6 years used 0.5 mg/kg successfully 3.
Key Considerations:
Start conservatively: Begin with 0.5 mg/kg (approximately 20 mg) IV every 8 hours, which can be increased to 1 mg/kg (39 mg) if needed for adequate pain control
Maximum duration: NSAIDs should be used for short-term postoperative pain management in hospital settings 1
Alternative IV NSAIDs: If IV diclofenac is unavailable, consider:
Critical Safety Points:
Contraindications: Avoid in patients with gastrointestinal disease, thrombocytopenia, heart failure, or renal impairment 1
Monitoring: Watch for gastrointestinal, renal, and cardiovascular adverse effects, though these are rare with short-term use at appropriate doses
Hydration status: Ensure adequate hydration before and during NSAID administration to minimize renal risk
Bleeding risk: While historically concerning, evidence suggests that at therapeutic doses, diclofenac does not significantly increase bleeding risk in the absence of contraindications 4
The FDA labeling for oral diclofenac does not provide specific pediatric IV dosing 5, making the European pediatric anesthesia guidelines the most authoritative source for this clinical scenario 1.