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# Ferrous Ascorbate
## Overview
Ferrous ascorbate is a chelated form of iron consisting of ferrous iron and ascorbic acid (Vitamin C). The inclusion of ascorbic acid serves to decrease the gastric pH and enhance the solubility and bioavailability of elemental iron in the proximal small intestine.
## Primary Indications
* Treatment of iron deficiency anemia (IDA).
* Prophylaxis of iron deficiency in high-risk populations (e.g., pregnancy, lactation).
## Adult Dosing
* **Standard Therapeutic Dose:** 100 mg of elemental iron equivalent once or twice daily.
* **Maximum Dose:** Generally 200 mg/day of elemental iron. Excessive dosing increases gastrointestinal side effects and does not significantly improve absorption rates due to hepcidin regulation.
## Pediatric Dosing
* **Treatment of IDA:** 3–6 mg/kg/day of elemental iron, divided into 1–3 doses.
* **Note:** Dosing varies significantly by local institutional protocols based on the child's age, weight, and the severity of the anemia. Always verify calculation against weight-based institutional guidelines.
## Dose Adjustments
* **Renal Impairment:** No specific adjustment required; however, caution is advised in chronic kidney disease patients due to potentially altered iron handling.
* **Hepatic Impairment:** No specific adjustment required.
## Contraindications
* Hypersensitivity to iron or ascorbic acid.
* Hemochromatosis, hemosiderosis, or any condition involving iron overload.
* Hemolytic anemia (unless iron deficiency is also present).
* Repeated blood transfusions.
## Adverse Effects
* **Common:** Gastrointestinal upset, nausea, abdominal pain, constipation, or diarrhea. Stools will turn dark or black (expected finding).
* **Serious:** Hemochromatosis (with chronic overdose), hypersensitivity reactions (rare).
## Key Drug Interactions
* **Absorption Inhibition:** Separate administration by at least 2 hours from antacids, calcium supplements, proton pump inhibitors (PPIs), or H2-receptor antagonists, as these increase gastric pH and reduce iron absorption.
* **Fluoroquinolones/Tetracyclines:** Iron forms insoluble complexes; separate by at least 2–4 hours (administer iron after the antibiotic, or as directed by pharmacology guidelines).
* **Levodopa/Methyldopa:** Iron may decrease the absorption of these agents.
## Monitoring
* **Hematology:** Hemoglobin (Hb) and reticulocyte count (usually measured 2–4 weeks after initiation).
* **Iron Stores:** Serum ferritin and transferrin saturation after 3 months of therapy to confirm repletion.
* **Adherence:** Monitor for GI side effects that may lead to non-compliance.
## Clinical Pearls
* **Bioavailability:** Ascorbic acid acts as a reducing agent, maintaining iron in the ferrous (Fe2+) state, which is better absorbed than the ferric (Fe3+) state.
* **Administration:** Ideally taken on an empty stomach to maximize absorption. If GI intolerance occurs, it may be taken with food, though this reduces absorption significantly.
* **Toxicity:** Iron is highly toxic to children. Keep out of reach of children; accidental overdose is a leading cause of fatal poisoning in the pediatric population.
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**Educational Disclaimer:** This information is for educational purposes only. Clinical practice varies based on region and institutional protocol. Always verify dosing, contraindications, and drug interactions using current, peer-reviewed clinical databases (e.g., Lexicomp, Micromedex) or your local formulary before prescribing or administering medication.
