Can You Take Doxycycline and Iron Together?
Iron can reduce how much doxycycline your body absorbs -- FDA labeling documents this directly.
What the interaction means
Doxycycline's FDA prescribing information states: "Absorption of tetracyclines is impaired by antacids containing aluminum, calcium, or magnesium, and iron-containing preparations."
Why it may happen
Iron can bind with doxycycline in the gastrointestinal tract, forming a complex that reduces how much of the antibiotic is absorbed. Unlike the calcium and magnesium findings (scoped to antacid formulations), this label states the iron finding for iron-containing preparations generally.
Practical context
The label does not give a specific number of hours to separate the two, only that absorption "is impaired" -- no spacing interval is published here for that reason.
What the sources say
Last reviewed 2026-08-22
Medical information disclaimer: this information is general and educational. It does not diagnose conditions, prescribe treatment, or determine whether a combination is safe for you personally. Follow your prescription label and ask a pharmacist or clinician before starting, stopping, or combining products. Full disclaimer.
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