1. Clinical Overview
Iron sucrose is a parenteral iron preparation consisting of a polynuclear iron(III)-hydroxide core stabilized by sucrose molecules. It is a colloidal solution for intravenous administration, used for the rapid correction of iron deficiency in patients where oral iron is ineffective or cannot be tolerated. It is a first-line IV iron therapy in India due to its favorable safety profile and rapid hemoglobin response.
| Onset | Duration | Bioavailability |
|---|---|---|
| Reticulocyte response begins within 3-7 days. | Hemoglobin levels typically increase within 2-4 weeks; iron stores are replenished for several months. | 100% (Intravenous administration). |
2. Mechanism of Action
Iron sucrose delivers elemental iron directly into the bloodstream, bypassing the gastrointestinal tract. The complex is phagocytosed by macrophages of the reticuloendothelial system. Within the macrophages, iron is released from the sucrose shell, enters the intracellular labile iron pool, and is subsequently released into the plasma where it binds to transferrin for transport to the bone marrow for incorporation into hemoglobin in developing red blood cells.
3. Indications & Uses
- Iron deficiency anemia in patients with chronic kidney disease (CKD) on hemodialysis and receiving erythropoietin.
- Iron deficiency anemia in non-dialysis dependent CKD patients.
- Iron deficiency anemia where oral iron preparations are ineffective or cannot be tolerated (e.g., inflammatory bowel disease, malabsorption syndromes).
4. Dosage & Administration
Adult Dosage: Dose is individualized based on total iron deficit. Formula: Total iron deficit (mg) = Body weight (kg) x (Target Hb - Actual Hb in g/dL) x 2.4 + Iron stores (500 mg). For CKD-HD patients: 100 mg slow IV injection or infusion during consecutive dialysis sessions until total dose is reached. Maximum single dose: 200 mg. For non-dialysis CKD & others: 200 mg administered over 15-30 minutes on 5 occasions within a 14-day period (total 1000 mg).
Administration: For IV injection: 100 mg (5 mL) undiluted, administered slowly at a rate of 1 mL/min (over 5 minutes). For IV infusion: Dilute 100 mg in a maximum of 100 mL of 0.9% Sodium Chloride. Infuse over at least 15 minutes. Must be administered only by healthcare professional in a setting with resuscitation facilities. Observe patient for at least 30 minutes post-infusion.
5. Side Effects
Common side effects may include:
- Metallic taste
- Transient taste disturbance
- Headache
- Nausea
- Vomiting
- Hypotension
- Flushing
- Injection site reactions (pain, phlebitis, discoloration)
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Oral Iron Supplements | Concurrent use is not recommended as it may increase risk of iron overload and does not significantly enhance efficacy. | Moderate |
| Angiotensin-Converting Enzyme (ACE) Inhibitors | May potentiate risk of systemic reactions (anaphylactoid). Monitor closely. | Moderate |
| Dimercaprol | Chelation may occur, leading to toxic complexes. Contraindicated. | Major |
| Chloramphenicol | May delay the hematologic response to iron therapy. | Moderate |
7. Patient Counselling
- Do report any history of allergies, asthma, or eczema to your doctor.
- Do inform your doctor about all other medications you are taking.
- Do remain seated or lying down for 30 minutes after the infusion as directed.
- Don't take oral iron supplements unless specifically advised by your doctor.
- Don't miss follow-up blood tests to monitor hemoglobin and iron stores.
8. Toxicology & Storage
Overdose: Acute overdose: Serum iron exceeding transferrin binding capacity leads to free iron toxicity - symptoms include nausea, vomiting, abdominal pain, diarrhea, hypotension, tachycardia, lethargy, cyanosis, coma, and cardiovascular collapse. Chronic overdose: Hemosiderosis leading to organ damage (liver, heart, pancreas).
Storage: Store below 25°C. Do not freeze. Protect from light. Keep in the outer carton. The solution should be clear and brown. Do not use if solution is cloudy, contains particulate matter, or if the vial is damaged. Use immediately after dilution. Discard any unused portion.