Dosing for a 5 kg Child
For a 5 kg child, give albendazole 200 mg as a single dose and ivermectin 0.75 mg (one-quarter of a 3 mg tablet) as a single dose.
Albendazole Dosing
The FDA-approved dosing for albendazole is weight-based: 15 mg/kg/day in divided doses twice daily for patients weighing less than 60 kg (maximum total daily dose 800 mg) 1. However, this refers to treatment courses for specific parasitic infections like hydatid disease or neurocysticercosis requiring prolonged therapy.
For single-dose deworming (the most common indication in pediatrics):
- Children receive 200 mg as a single dose when used for soil-transmitted helminths 1
- The 200 mg dose has been validated in pediatric studies, including children as young as 5-11 years 2
- For a 5 kg child, this translates to 40 mg/kg, which is appropriate for single-dose deworming regimens
Key consideration: Albendazole should be administered with food to enhance absorption (up to 5-fold increase in bioavailability with fatty meals) 1.
Ivermectin Dosing
For ivermectin in very young children, recent pharmacokinetic modeling provides specific guidance:
For infants 3-7 months of age, the recommended dose is 0.75 mg (one-quarter of a 3 mg tablet) 3. This dosing strategy was developed using a CYP3A4 maturation-based population pharmacokinetic model to achieve equivalent drug exposure (median AUC₀₋∞ of 835 μg/L·h) compared to older children receiving the standard 200 μg/kg dose 3.
For a 5 kg child (likely 3-7 months old based on weight):
- 0.75 mg achieves appropriate exposure (80-125% of reference AUC in older children) 3
- This is approximately 150 μg/kg, which aligns with guideline recommendations of 150-200 μg/kg 4
Important Clinical Caveats
Age and weight considerations:
- Traditional ivermectin dosing uses 200 μg/kg, but this would be 1 mg for a 5 kg child
- The newer evidence-based approach using 0.75 mg accounts for developmental pharmacokinetics and provides more reliable exposure 3
- Ivermectin is not FDA-licensed for children <15 kg, but the recent pharmacokinetic data supports safe use in children ≥3 months 3
Practical administration:
- Albendazole 200 mg tablets can be crushed if the child cannot swallow whole 1
- Ivermectin 3 mg tablets can be split into quarters for the 0.75 mg dose 3
- Both medications should be given with food
Safety profile:
- Both drugs are generally well-tolerated in children
- The combination of albendazole + ivermectin has been studied extensively in pediatric populations with no significant increase in adverse events compared to either drug alone 2, 5, 6
- No serious adverse events were reported in recent large-scale trials 5