No Clinically Significant Interaction Between Amiodarone and Iron
There is no documented interaction between amiodarone and iron supplements based on available evidence. Neither the comprehensive amiodarone guidelines 1 nor the FDA drug label 2 mention iron as an interacting substance.
Evidence Review
What the Guidelines Tell Us
The American Family Physician guidelines on amiodarone 1 provide extensive detail on drug interactions, specifically identifying:
- CYP450-mediated interactions: Amiodarone inhibits CYP3A4, CYP2C9, CYP2D6, and CYP1A2
- P-glycoprotein interactions: Amiodarone inhibits this transporter system
- Clinically important interactions: Warfarin, digoxin, beta blockers, calcium channel blockers, cyclosporine, statins, protease inhibitors, cimetidine, loratadine, and trazodone
- Food interactions: Grapefruit juice (increases amiodarone levels by 50%)
Iron is conspicuously absent from all interaction lists 1.
FDA Drug Label Confirmation
The FDA-approved prescribing information 2 comprehensively details amiodarone's drug interaction profile through CYP450 and P-glycoprotein mechanisms. Iron supplements are not mentioned as interacting agents.
Understanding Iron's Interaction Profile
While iron does interact with certain medications 3—notably tetracyclines, penicillamine, methyldopa, levodopa, and ciprofloxacin through chelation mechanisms—amiodarone is not among these drugs. Iron's interactions occur primarily through:
- Chelation/complex formation with specific chemical structures
- Binding in the gastrointestinal tract reducing absorption
Amiodarone, as an iodinated benzofuran derivative 1, does not share the chemical characteristics that would promote chelation with iron.
Clinical Bottom Line
Patients taking amiodarone can safely take iron supplements without dose adjustment or timing separation. The absence of this interaction in:
...provides strong negative evidence that no clinically meaningful interaction exists.
What You Should Actually Monitor
Instead of worrying about iron, focus on amiodarone's real drug interactions 1:
- Warfarin: Reduce dose by 30-50%, monitor INR weekly for 6 weeks (peak effect at 7 weeks)
- Digoxin: Reduce dose by 50%, monitor levels closely
- Statins (simvastatin/atorvastatin): Risk of rhabdomyolysis
- Grapefruit juice: Avoid completely