Ferric Carboxymaltose Dosing for 32 kg Patient
For a patient weighing 32 kg, administer ferric carboxymaltose at 15 mg/kg body weight, which equals 480 mg as a single intravenous infusion, diluted in 100 mL normal saline and infused over 20-30 minutes. 1
Dosing Algorithm
The FDA-approved dosing for ferric carboxymaltose follows a weight-based approach:
- Patients ≥50 kg: Maximum single dose of 750 mg
- Patients <50 kg: Dose at 15 mg/kg body weight (not to exceed 750 mg per dose)
For your 32 kg patient:
- Calculated dose: 32 kg × 15 mg/kg = 480 mg
- This can be repeated at least 7 days later if additional iron repletion is needed, up to a cumulative dose of 1,500 mg 1
Administration Details
Preparation and infusion technique:
- Dilute the calculated dose (480 mg) in 100 mL of normal saline
- Infuse over 20-30 minutes
- Start the infusion slowly and observe for several minutes before completing the infusion 2
- Monitor for acute onset of minor infusion reactions throughout administration
Important Clinical Considerations
Hypophosphatemia risk: FCM is associated with treatment-emergent hypophosphatemia and should be avoided in patients requiring repeat infusions 2. This is particularly relevant given recent data showing 51% of patients develop moderate-to-severe hypophosphatemia at day 21 post-infusion, though this is typically transient and clinically benign 3.
Pediatric context: The safety and effectiveness of FCM in pediatric patients aged 1 year and older with iron deficiency anemia has been established, with pharmacokinetic data showing appropriate exposure levels at the 15 mg/kg dose 1.
Follow-up Assessment
Reassess hemoglobin and iron parameters (ferritin, transferrin saturation) 4 to 8 weeks after the last infusion to determine if additional dosing is needed 2. Do not check iron parameters immediately post-infusion as they will be artificially elevated.