Is Iron Safe with Doxycycline?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Take iron supplements at least 2–3 hours apart from Doxycycline. Preferably take Doxycycline on an empty stomach unless GI upset occurs.
Why this interaction occurs
Iron chelates with the tetracycline ring structure of Doxycycline, reducing its absorption by up to 80%, risking inadequate serum levels and treatment failure.
Evidence
Evidence level: strong.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 72,559 reports mentioning Doxycycline. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Doxycycline + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Iron interactions → · All Doxycycline interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.