Fluconazole Dosing for a 14.88 kg Child
For a child weighing 14.88 kg, the appropriate fluconazole dose depends on the indication, but using the 40 mg/mL oral suspension, you would administer 3.75 mL once daily for most common indications (oropharyngeal candidiasis maintenance) or 7.5 mL once daily for more serious infections (esophageal candidiasis or systemic infections).
Dose Calculation by Indication
The FDA-approved pediatric dosing for fluconazole varies significantly by indication 1:
For Oropharyngeal Candidiasis:
- Loading dose (Day 1): 6 mg/kg = 89.3 mg ≈ 90 mg (2.25 mL of 40 mg/mL suspension)
- Maintenance (Day 2 onward): 3 mg/kg = 44.6 mg ≈ 45 mg (1.125 mL) once daily
For Esophageal Candidiasis or Systemic Candida Infections:
- Loading dose (Day 1): 6 mg/kg = 89.3 mg ≈ 90 mg (2.25 mL)
- Maintenance: 3-6 mg/kg daily = 44.6-89.3 mg
- For moderate infections: 6 mg/kg = 90 mg (2.25 mL) once daily
- For severe infections: Up to 12 mg/kg = 178.6 mg ≈ 180 mg (4.5 mL) once daily 1
For Cryptococcal Meningitis:
- Loading dose (Day 1): 12 mg/kg = 178.6 mg ≈ 180 mg (4.5 mL)
- Maintenance: 6 mg/kg = 89.3 mg ≈ 90 mg (2.25 mL) once daily
- May increase to 12 mg/kg daily based on response 1
Practical Dosing with 40 mg/mL Suspension
The commercially available fluconazole suspension is typically 40 mg/mL 1. For this 14.88 kg child:
| Indication | Dose (mg/kg) | Total mg | Volume (mL) |
|---|---|---|---|
| Oropharyngeal (maintenance) | 3 | 45 | 1.125 |
| Esophageal/Systemic (standard) | 6 | 90 | 2.25 |
| Severe systemic | 12 | 180 | 4.5 |
Important Clinical Considerations
Age-related pharmacokinetics: Children clear fluconazole more rapidly than adults (half-life ~14 hours vs. 30 hours), which is why pediatric doses are higher per kilogram 2, 1. The volume you administer accounts for this accelerated clearance.
Renal function: If serum creatinine is elevated (>1.2 mg/dL), reduce the dose by 50% or extend the dosing interval 1. This is critical as fluconazole is primarily renally cleared.
Duration of therapy:
- Oropharyngeal candidiasis: minimum 2 weeks 1
- Esophageal candidiasis: minimum 3 weeks and at least 2 weeks after symptom resolution 1
- Systemic infections: individualized based on clinical response, typically 2 weeks after blood culture clearance 3, 4
Common pitfall: Do not use the adult 6 mg/mL suspension dosing volumes for the 40 mg/mL formulation—this would result in a 6.7-fold overdose. Always calculate based on the actual concentration available 1.
Drug interactions: If the child is on medications metabolized by CYP3A4 (e.g., certain anticonvulsants), monitor for interactions as fluconazole is a moderate CYP3A4 inhibitor 1.