What is the appropriate dosing regimen for intravenous iron sucrose?

IV Iron Sucrose Dosing

For hemodialysis patients, administer 100 mg of iron sucrose intravenously during each dialysis session for 10 consecutive sessions (total 1000 mg), followed by maintenance dosing of 25-125 mg weekly to maintain iron stores. 111

Dosing by Clinical Context

Hemodialysis Patients

Initial Replacement (Iron Deficiency Present):

• 100 mg IV during each hemodialysis session for 10 consecutive sessions 112
• Can be administered as a 2-minute IV push or diluted in 50-100 mL saline over 30-60 minutes 13
• Reassess iron parameters (TSAT, ferritin) 2-7 days after the last dose 1
• If TSAT remains <20% and/or ferritin <100 ng/mL, repeat another 10-dose course 1

Maintenance Dosing:

• 25-125 mg IV weekly (or 250-1,000 mg total within 12 weeks) 11
• Can be given thrice weekly, twice weekly, weekly, or every other week 1
• Monitor TSAT and ferritin every 3 months 11
• Withhold if TSAT >50% or ferritin >800 ng/mL for up to 3 months 1

Non-Dialysis CKD and Peritoneal Dialysis Patients

For patients unable to maintain iron stores with oral iron:

• Single doses of 500-1,000 mg diluted in 250 mL normal saline infused over 1 hour 111
• Repeat as necessary to maintain adequate iron stores 1
• Patients should be informed of increased incidence of myalgias/arthralgias with these larger doses 1
• Alternative: 100 mg monthly maintenance has shown efficacy in PD patients 4

Pediatric Dosing

Hemodialysis (10-dose course):

• <10 kg: 25 mg per dose
• 10-20 kg: 50 mg per dose
• ≥20 kg: 100 mg per dose 111

Non-dialysis CKD/PD:

• <10 kg: 125 mg total dose
• 10-20 kg: 250 mg total dose
• ≥20 kg: 500 mg total dose 111

Critically ill children: 7 mg/kg per dose (maximum 200 mg) showed superior iron deficit replacement compared to lower doses 5

Inflammatory Bowel Disease

Based on body weight and hemoglobin:

• Hemoglobin 10-12 g/dL (women) or 10-13 g/dL (men):
  • <70 kg: 1000 mg total
  • ≥70 kg: 1500 mg total
• Hemoglobin 7-10 g/dL:
  • <70 kg: 1500 mg total
  • ≥70 kg: 2000 mg total 6

Note: Iron sucrose is limited to 200-300 mg per treatment episode with repeated dosing required 6. Newer formulations (ferric carboxymaltose, iron isomaltoside) allow higher single doses.

Pregnancy

• Iron sucrose is safe after the first trimester 7
• Multiple 300 mg doses over several weeks have been used effectively 8
• Optimal timing: 2-12 weeks before delivery for maximum hemoglobin increase 8
• At least 3 doses show statistically significant benefit 8

Administration Guidelines

Test Dose

• 25 mg IV test dose required before first administration 1
• Pediatric: 10 mg if <10 kg, 15 mg if 10-20 kg 1
• Wait 15-60 minutes to observe for anaphylaxis-like reactions 1
• Subsequent doses do not require test doses 1

Infusion Methods

• 2-minute IV push: 200 mg can be safely administered as bolus over 2 minutes 3

  • Most practical and cost-effective method 1
  • 97.5% of 2,297 injections proceeded uneventfully 3
  • Metallic taste occurs in 17.9% but is mild and transient 3

• Slow infusion: Dilute in 50-100 mL normal saline, infuse over 30-60 minutes 11

Maximum Single Dose

• 200 mg per administration is the traditional limit for iron sucrose 11
• Single doses up to 7 mg/kg have been tested in clinical trials 6
• FDA label does not specify maximum single dose but pharmacokinetic data exists for doses up to 200 mg 7

Monitoring

Timing of Iron Parameters:

• Wait 2-7 days after last dose for doses of 100-125 mg 1
• Wait 14 days after single doses ≥1000 mg 11
• Hemoglobin should increase 1-2 g/dL within 4-8 weeks 9

Target Parameters:

• TSAT ≥20% 11
• Ferritin ≥100 ng/mL 11
• Upper safety limits: TSAT <50%, ferritin <800 ng/mL 1

Safety Considerations

Adverse Reactions:

• Serious hypersensitivity reactions occur in <1% of administrations 12
• No test dose required for subsequent administrations after initial dose 1
• No anaphylaxis-like reactions reported in study of 2,297 injections 3
• Well tolerated in 665 hemodialysis patients receiving 8,583 doses 2

Common Pitfalls:

• Measuring iron parameters too soon after large doses leads to spuriously elevated results 11
• Withholding iron when TSAT is <20% despite elevated ferritin (functional iron deficiency) 1
• Using oral iron in hemodialysis patients—it fails to maintain adequate stores in most cases 11

Contraindications:

• Avoid if TSAT >50% and ferritin >800 ng/mL 1
• Monitor for iron overload, though risk is low in patients with ongoing blood losses 6