🩸 Oral Iron Supplementation Dosing Simulator

Choosing an Iron Salt — Sulfate, Fumarate, or Gluconate

Placeholder: salts differ mainly in elemental iron content per tablet.

• 20%: Ferrous sulfate elemental (placeholder value)
• 33%: Ferrous fumarate elemental (placeholder value)
• 12%: Ferrous gluconate elemental (placeholder value)
• 300 mg: Typical tablet strength (placeholder value)

Why formulation matters

Placeholder: salt choice changes elemental iron delivered per pill.

Clinical preference patterns

Placeholder: gluconate often chosen for gentler GI profile.

Dose and Schedule Setup — Splitting the Daily Iron Load

Placeholder: larger single doses increase side effects, not always absorption.

• 60–120 mg: Common daily dose (placeholder value)
• ~325 mg salt: Max single dose (placeholder value)
• emerging option: Alternate-day dosing (placeholder value)
• 1–3×/day: Divided doses (placeholder value)

Frequency vs. tolerability

Placeholder: splitting dose can reduce peak GI irritation.

Alternate-day strategy

Placeholder: less frequent dosing may raise absorption fraction.

GI Absorption — Duodenal Uptake via DMT1

Placeholder: ferrous iron is absorbed mainly in the duodenum.

• Duodenum: Absorption site (placeholder value)
• DMT1: Key transporter (placeholder value)
• 10–35%: Typical fraction absorbed (placeholder value)
• downregulates uptake: Hepcidin regulation (placeholder value)

Transporter saturation

Placeholder: higher doses saturate DMT1, lowering efficiency.

Hepcidin feedback

Placeholder: iron stores signal hepcidin to blunt absorption.

GI Side Effect Buildup — Nausea, Cramping, and Constipation

Placeholder: unabsorbed iron irritates the gut lining.

• dose-dependent: Nausea incidence (placeholder value)
• common at high dose: Constipation incidence (placeholder value)
• benign side effect: Dark stool (placeholder value)
• up to ~20%: Discontinuation rate (placeholder value)

Mechanism of GI irritation

Placeholder: free luminal iron generates reactive oxidative stress.

Mitigation strategies

Placeholder: lower dose, food, or alternate-day schedule helps.

Hemoglobin Response Over Weeks of Supplementation

Placeholder: hemoglobin rises gradually as absorbed iron fuels erythropoiesis.

• ~0.1–0.2 g/dL/wk: Expected rise (placeholder value)
• peaks ~7–10 days: Reticulocyte response (placeholder value)
• 3–6 months: Typical course length (placeholder value)
• after Hgb normalizes: Repletion of stores (placeholder value)

Erythropoiesis timeline

Placeholder: marrow response lags several days behind absorption.

Monitoring response

Placeholder: recheck hemoglobin after several weeks of therapy.

Placeholder: inadequate rise after a month prompts re-evaluation.