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# Ferrous ascorbate
## Overview
Ferrous ascorbate is a chelated salt of iron and ascorbic acid (vitamin C). The presence of ascorbic acid facilitates the reduction of ferric iron ($Fe^{3+}$) to ferrous iron ($Fe^{2+}$), which is more readily absorbed, and maintains a favorable acidic environment in the duodenum.
## Primary Indications
* Treatment and prophylaxis of iron-deficiency anemia (IDA).
* Iron deficiency states where oral supplementation is required.
## Adult Dosing
* **Typical Treatment Dose:** 100 mg elemental iron equivalent daily or twice daily.
* **Maximum Dose:** Generally 200 mg elemental iron per day. High doses often lead to diminishing absorption due to hepcidin elevation and increased GI toxicity.
## Pediatric Dosing
* **Treatment:** 3–6 mg/kg/day of elemental iron in 1 to 3 divided doses.
* **Maximum Dose:** Do not exceed adult maximums; use local institutional protocols for specific weight-based titration.
## Dose Adjustments
* **Renal Impairment:** No standard dosage adjustment; however, closely monitor for iron overload in patients receiving frequent transfusions.
* **Hepatic Impairment:** Use with caution; monitor for potential iron accumulation.
## Contraindications
* Hypersensitivity to iron products or ascorbic acid.
* Hemochromatosis and hemosiderosis (iron overload).
* Hemolytic anemias (unless IDA is also confirmed).
* Repeated blood transfusions.
## Adverse Effects
* **Gastrointestinal:** Nausea, constipation, diarrhea, abdominal pain, and dark/black stools (expected and benign).
* **Systemic:** Potential for tooth staining (if liquid formulation), vomiting, and epigastric pain.
## Key Drug Interactions
* **Antacids/H2-agonists/PPIs:** Decrease absorption; separate administration by at least 2 hours.
* **Fluoroquinolones/Tetracyclines:** Iron chelates these antibiotics, reducing their efficacy. Administer iron 2 hours before or 4–6 hours after antibiotic doses.
* **Levodopa/Methyldopa:** Absorption may be reduced by iron.
* **DMSA/Dimercaprol:** Avoid concurrent use; risks forming toxic metal complexes.
## Monitoring
* **Baseline:** Complete Blood Count (CBC) with indices, serum ferritin, and iron saturation (TSAT).
* **Follow-up:** Reticulocyte count (7–10 days post-initiation); hemoglobin/hematocrit (4 weeks post-initiation).
* **Toxicity:** Monitor for signs of iron overdose in pediatric patients (e.g., severe vomiting, hematemesis, shock).
## Clinical Pearls
* **Absorption:** Vitamin C (ascorbic acid) is already present in this formulation, theoretically enhancing absorption compared to ferrous sulfate.
* **Administration:** Best absorbed on an empty stomach; if GI intolerance occurs, administer with a small amount of food, recognizing this may decrease bioavailability.
* **Safety:** Iron overdose is a medical emergency in children. Always store in "child-proof" containers.
* **Duration:** Therapy should generally continue for 3 months after the normalization of hemoglobin levels to replenish iron stores.
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**Educational Disclaimer:** This information is for educational purposes only. Clinical dosing may vary based on local protocols, patient-specific comorbidities, and individual institutional guidelines. Always verify current prescribing information in a trusted clinical resource (e.g., Lexicomp, UpToDate) or the product monograph before prescribing or administering medication.
