Fluconazole Dosing for a 22.04 kg Child
For invasive candidiasis in a child weighing 22.04 kg, administer fluconazole 12 mg/kg/day (264 mg/day or 6.6 mL of 40 mg/mL suspension daily), divided into two doses of 132 mg (3.3 mL) every 12 hours. 1, 2
Dosing Rationale
For Invasive Candidiasis (Candidemia, Disseminated Candidiasis)
The FDA label specifies 6-12 mg/kg/day for systemic Candida infections in children, with the higher end of this range (12 mg/kg/day) recommended for serious invasive disease. 2
CDC guidelines recommend 5-6 mg/kg twice daily (total 10-12 mg/kg/day) for invasive candidiasis, with a maximum daily dose of 600 mg—well above the 264 mg calculated for this child. 1
For this 22.04 kg child: 12 mg/kg/day = 264 mg/day total, administered as 132 mg (3.3 mL) twice daily. 2
Critical Dosing Considerations
Twice-daily dosing is essential for invasive disease—once-daily regimens risk therapeutic failure and should never be used for serious infections. 1
Do NOT initiate fluconazole empirically without species identification, as Candida krusei and C. glabrata exhibit fluconazole resistance; amphotericin B should be used until susceptibility is confirmed. 3, 4
For uncomplicated Candida albicans candidemia, treat for a minimum of 4 weeks after documented clearance and resolution of symptoms. 1
Alternative Indications (Lower Doses)
If this child has oropharyngeal candidiasis instead:
- Loading dose: 6 mg/kg (132 mg or 3.3 mL) on day 1
- Maintenance: 3 mg/kg once daily (66 mg or 1.65 mL daily) for at least 2 weeks 2
If this child has esophageal candidiasis:
- Loading dose: 6 mg/kg (132 mg or 3.3 mL) on day 1
- Maintenance: 3 mg/kg once daily (66 mg or 1.65 mL daily), with doses up to 12 mg/kg/day for refractory cases 2
Safety Profile
Fluconazole is well-tolerated in children, with gastrointestinal side effects (7.7%) and rash (1.2%) being most common; only 3.2% of pediatric patients discontinue due to adverse effects. 5
Transient hepatic enzyme elevations occur in <5% of children (ALT 4.9%, AST 2.7%, alkaline phosphatase 2.3%) but are typically self-limiting. 5
No dose adjustment is needed for normal renal function; however, if serum creatinine is elevated, reduce the dose by 50% after a loading dose. 2
Common Pitfalls to Avoid
Never use once-daily dosing for invasive candidiasis—this is appropriate only for mucocutaneous infections, not life-threatening systemic disease. 1
Always confirm Candida species and susceptibility before continuing fluconazole, as non-albicans species may require alternative therapy. 3, 4
Do not underdose—research demonstrates that 12 mg/kg/day is necessary to achieve therapeutic targets (AUC >400 mg·h/L) in >80% of infants and children with invasive disease. 6