Ferrous Sulfate Dosing for 14.06 kg Child
For a child weighing 14.06 kg with iron deficiency anemia, administer 3 mg/kg/day of elemental iron, which equals 42 mg of elemental iron daily. Given your formulation of 5 mg elemental iron per 20 ml, this translates to 168 ml daily (42 mg ÷ 5 mg × 20 ml).
Dosing Algorithm
Step 1: Calculate Elemental Iron Requirement
- Standard dose: 3 mg/kg/day of elemental iron 1, 2, 3
- For 14.06 kg child: 3 mg/kg × 14.06 kg = 42.18 mg elemental iron per day
Step 2: Convert to Your Formulation
Your concentration: 5 mg elemental iron per 20 ml = 0.25 mg/ml
Volume needed: 42 mg ÷ 0.25 mg/ml = 168 ml daily
Step 3: Dosing Schedule
- Single daily dose is optimal 1, 4
- Administer in the morning on an empty stomach 5
- Give with vitamin C (100 mg) or citrus juice to enhance absorption 5
- Avoid milk, tea, coffee, cereals, or calcium supplements at the same time 5
Important Clinical Considerations
Dosing Range Context
The evidence supports a range of 3-6 mg/kg/day 2, 3, with recent high-quality data showing 3 mg/kg/day is as effective as higher doses with fewer side effects 1. A 2017 randomized trial demonstrated that low-dose ferrous sulfate (3 mg/kg/day) significantly increased hemoglobin by 4.0 g/dL over 12 weeks in children aged 9-48 months 1.
Maximum Daily Dose
While your calculated dose (42 mg) is well below the maximum of 5 mg/day mentioned in parenteral nutrition guidelines 6, note that these guidelines refer to parenteral iron. For oral iron, doses up to 6 mg/kg/day are commonly used 3.
Expected Response
- Hemoglobin should increase ≥1 g/dL after 4 weeks 2
- Continue treatment for 2-3 months total to replenish iron stores 2, 7
- Recheck hemoglobin at 4 weeks and at end of treatment 2
Critical Pitfalls to Avoid
Timing errors: Afternoon dosing reduces absorption significantly 5. Always dose in the morning.
Food interactions: Administering with meals, especially cereals or dairy, markedly impairs absorption 5. Ensure fasting stomach (at least 30-60 minutes before food).
Formulation confusion: Your formulation is extremely dilute (5 mg/20 ml = 0.25 mg/ml). Standard ferrous sulfate drops typically contain 15 mg/ml or higher. Verify this concentration is correct - if this is an error, the volume would be drastically different.
Pill esophagitis risk: Though you have a liquid formulation, ensure the child remains upright for 30-60 minutes after administration 5.
Alternative Dosing Strategy
If the 168 ml volume seems impractical (which it is), consider:
- Alternate-day dosing may improve absorption and reduce side effects 4, 5
- However, this approach showed slower initial response in some studies 4
- Recommendation: Verify your formulation concentration with pharmacy, as this volume is unusually large for pediatric iron supplementation
The evidence strongly supports ferrous sulfate over other iron preparations (iron polysaccharide complex, iron polymaltose) for superior hemoglobin response and complete resolution of iron deficiency 1, 8.