Intravenous Iron Therapy: Re-administration after Prior Adverse Reaction.

Area of Science:

• Hematology
• Pharmacology
• Clinical Medicine

Background:

• Intravenous (IV) iron therapy is crucial for treating iron deficiency anemia when oral iron is ineffective.
• Modern IV iron formulations are used in various clinical settings.
• A key clinical question is the safety of re-administering IV iron after a previous adverse reaction.

Purpose of the Study:

• To review the literature on the safety and efficacy of rechallenging patients with IV iron who have a history of adverse reactions.
• To explore the clinical indications and considerations for IV iron rechallenge.

Main Methods:

• A literature search identified five studies involving 1,006 patients with a history of IV iron reactions.
• Analysis focused on re-exposure data, including reactions of mild, moderate, and severe types.

Main Results:

• The majority of IV iron rechallenges (>80%) were well-tolerated, safe, and successful.
• No major serious incidents, including severe hypersensitivity reactions or anaphylaxis, were reported during re-exposure.

Conclusions:

• Re-administration of IV iron is plausible in patients with prior adverse reactions, requiring careful benefit-risk stratification.
• The decision to rechallenge depends on the severity of the previous reaction and the use of alternative formulations.
• Further research is needed on the efficacy of premedication, as current evidence is conflicting.