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Ferrous Sulfate Mechanism of Action: A Comprehensive Guide

Introduction
Ferrous sulfate is a widely used iron supplement for treating iron-deficiency anemia. Understanding its mechanism of action helps optimize its therapeutic use. This article explains how ferrous sulfate works in the body to restore iron levels and improve health.

What Is Ferrous Sulfate?
Ferrous sulfate is an iron salt that provides elemental iron, essential for hemoglobin production. It is commonly prescribed in oral form to correct iron deficiency.

Mechanism of Action

1. Absorption in the GI Tract
Ferrous sulfate is absorbed primarily in the duodenum and upper jejunum. The divalent iron (Fe²⁺) is transported across the intestinal lining via the DMT1 (divalent metal transporter 1) protein.

2. Conversion to Ferric Iron
Once absorbed, Fe²⁺ is oxidized to ferric iron (Fe³⁺) by hephaestin or ceruloplasmin, allowing it to bind to transferrin for transport in the bloodstream.

3. Transport and Storage
Transferrin delivers iron to bone marrow for hemoglobin synthesis and to tissues for storage as ferritin. Excess iron is stored in the liver, spleen, and bone marrow.

4. Hemoglobin Production
Iron is incorporated into heme, a key component of hemoglobin, enhancing oxygen transport and alleviating anemia symptoms.

Factors Affecting Absorption
– Vitamin C enhances absorption by reducing Fe³⁺ to Fe²⁺.
– Antacids and calcium-rich foods inhibit absorption.
– Gastric acidity improves solubility and uptake.

Conclusion
Ferrous sulfate effectively treats iron deficiency by replenishing iron stores and supporting hemoglobin production. Proper absorption and utilization depend on dietary and physiological factors, making optimal dosing crucial for efficacy.

By understanding the mechanism of ferrous sulfate, patients and healthcare providers can maximize its benefits while minimizing side effects.