Clinician tool

Iron Infusion Dose Calculator

Ferric carboxymaltose (Ferinject and generics) for adults and adolescents 14 and over. Ganzoni deficit, the product information table and a dose plan.

For clinicians. Check the current product information and your local protocol before prescribing. Adult and adolescent (14+) dosing only. This doesn’t replace clinical judgement. Nothing you enter leaves this device.

Simplified table (body weight ≥35 kg)

Total iron need, ferric carboxymaltose. Your patient’s row is highlighted.

• Hb under 100 g/L35 to under 70 kg: 1500 mg · 70 kg and over: 2000 mg
• Hb 100 to under 140 g/L35 to under 70 kg: 1000 mg · 70 kg and over: 1500 mg
• Hb 140 g/L or more500 mg (either weight). Recheck iron studies before any repeat dose.

The PI advises caution with the simplified method because it rests on limited trial data.

Limits per administration

• Single dose: no more than 20 mg/kg, and no more than 1000 mg (20 mL).
• No more than 1000 mg per week. Give any further dose at least 7 days later.
• Under 35 kg: use Ganzoni only, with target Hb 130 g/L and stores 15 mg/kg (filled in automatically).
• Ganzoni rounding (PI): round down to the nearest 100 mg if 66 kg or less, round up if over 66 kg.

Safety

• Low phosphate. Common after ferric carboxymaltose, usually silent and short-lived. Repeat doses and risk factors (malnutrition, malabsorption, low vitamin D, hyperparathyroidism) can lead to osteomalacia and fractures. Check phosphate before repeat courses; ask about bone pain or tiredness.
• Skin staining. Extravasation can cause long-lasting brown staining. Stop the infusion at once if leakage occurs, and warn the patient beforehand.
• Hypersensitivity: give where resuscitation is available and observe for at least 30 minutes.

Alternative: ferric derisomaltose

Ferric derisomaltose (Monofer) is another high-dose IV iron. Trials show lower rates of low phosphate than ferric carboxymaltose, so it can suit patients at risk. Its doses and limits differ: use its own product information, not this calculator.

Sources

• Ferinject data sheet (CSL Vifor), revised 18 July 2024. Simplified table, Ganzoni method, dose limits, phosphate and extravasation warnings.
• Ferric Carboxymaltose Teva, Australian PI (approved 22 Sept 2025). Same table and limits.
• Ferrive (ferric carboxymaltose), Australian PI (Nov 2025). Same table and limits.
• Australian Prescriber: Skin staining from iron infusions

Checked October 2026. Education for clinicians, not a prescription. Check the current PI and local protocols.