1. Clinical Overview
Sodium Feredetate is a stable, water-soluble chelate of ferric iron (Fe³⁺) with sodium EDTA, containing approximately 12.5% elemental iron. It is a third-generation oral iron preparation designed for superior tolerability and absorption in the gastrointestinal tract compared to traditional iron salts like ferrous sulfate. It is indicated for the treatment and prevention of iron deficiency anemia (IDA). Its chelated structure prevents the release of free ionic iron in the stomach, minimizing gastric irritation and oxidative stress, making it a preferred choice in patients intolerant to conventional iron therapy.
| Onset | Duration | Bioavailability |
|---|---|---|
| Reticulocyte response typically begins within 5-7 days. A significant rise in hemoglobin (Hb) is usually observed within 2-3 weeks of initiation. | The therapeutic effect on hemoglobin levels is sustained with continuous daily dosing. Iron stores (ferritin) are replenished over several months. | Approximately 5-10%. While lower in percentage than some salts, the improved tolerability allows for better patient compliance and consistent intake, leading to effective clinical outcomes. Absorption is via an active transport mechanism in the duodenum and proximal jejunum. |
2. Mechanism of Action
Sodium Feredetate provides ferric iron in a pre-chelated, non-ionic form. This chelate is stable in the acidic pH of the stomach, preventing the precipitation of ferric hydroxide. In the duodenum and jejunum, the entire chelate molecule is absorbed intact via a paracellular or specific chelate transport pathway, distinct from the DMT-1 transporter used by ferrous ions. Inside the enterocyte or in the plasma, iron is released from the EDTA complex and binds to apotransferrin to form transferrin, which transports iron to bone marrow for hemoglobin synthesis and to storage sites (liver, spleen) as ferritin.
3. Indications & Uses
- Iron Deficiency Anemia (IDA) - treatment
- Iron Deficiency Anemia (IDA) - prophylaxis in high-risk groups (e.g., pregnancy, menorrhagia, chronic kidney disease)
4. Dosage & Administration
Adult Dosage: For treatment of IDA: 1 tablet (231mg) once or twice daily. For prophylaxis: 1 tablet daily. Should be taken on an empty stomach, at least 1 hour before or 2 hours after meals, for optimal absorption. If gastric upset occurs, may be taken with a small amount of food, understanding this may reduce absorption.
Administration: Swallow the tablet whole with a full glass of water. Do not crush, chew, or break. Take at least 2 hours before or 4 hours after antacids, tetracyclines, or fluoroquinolones. Can be taken with Vitamin C (ascorbic acid) to enhance absorption.
5. Side Effects
Common side effects may include:
- Nausea
- Epigastric discomfort
- Constipation (less frequent than with ferrous sulfate)
- Diarrhea
- Dark green/black colored stools
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Antacids (Aluminum, Magnesium, Calcium salts) | Decreased absorption of iron due to increased pH and formation of insoluble complexes. | Major |
| Tetracycline antibiotics (Doxycycline, Tetracycline) | Mutual decrease in absorption; forms insoluble chelates. | Major |
| Fluoroquinolones (Ciprofloxacin, Levofloxacin) | Decreased absorption of fluoroquinolone; forms chelates. | Major |
| Levothyroxine | Decreased absorption of levothyroxine, potentially reducing its efficacy. | Major |
| Bisphosphonates (Alendronate) | Decreased absorption of bisphosphonate. | Moderate |
| Penicillamine | Decreased absorption of penicillamine. | Moderate |
| Chloramphenicol | Delayed iron response due to chloramphenicol's effect on erythropoiesis. | Moderate |
| Vitamin C (Ascorbic Acid) | May enhance the absorption of iron. | Minor (Beneficial) |
7. Patient Counselling
- DO take on an empty stomach for best absorption.
- DO take with Vitamin C (e.g., orange juice) if tolerated.
- DO continue treatment for as long as prescribed, even if symptoms improve, to replenish iron stores.
- DON'T take with antacids, milk, tea, or coffee. Separate by 1-2 hours.
- DON'T crush or chew the tablet.
- DO inform your doctor if you are taking thyroid medication, antibiotics, or osteoporosis drugs.
- DO store safely out of reach of children.
8. Toxicology & Storage
Overdose: Early symptoms: Nausea, vomiting, abdominal pain, diarrhea, lethargy. Severe overdose: Metabolic acidosis, hypovolemic shock, coagulopathy, hepatic necrosis, coma. Symptoms may be delayed 30-60 minutes post-ingestion.
Storage: Store below 30°C in a cool, dry place. Protect from light and moisture. Keep the container tightly closed. Keep out of reach and sight of children.