Drug interactions
Calcium citrate + Ferrous fumarate
Severity: Minor
Calcium citrate and Ferrous fumarate: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Calcium citrate taken with oral iron can reduce iron absorption. The reduction is usually modest but may matter in patients being treated for iron deficiency.
What this interaction means in plain words
Calcium citrate and Ferrous fumarate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Calcium inhibits intestinal iron uptake by competing for transport and forming complexes.
What to do
Separate doses by at least 2 hours, ideally taking iron away from calcium-containing meals or supplements. Check iron indices if anemia persists.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Ferrous fumarate
Frequently asked questions
Can I take Calcium citrate with Ferrous fumarate?
MediHelp rates the interaction as minor. Calcium citrate and Ferrous fumarate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Calcium citrate taken with oral iron can reduce iron absorption. The reduction is usually modest but may matter in patients being treated for iron deficiency.
How serious is the interaction between Calcium citrate and Ferrous fumarate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Separate doses by at least 2 hours, ideally taking iron away from calcium-containing meals or supplements. Check iron indices if anemia persists.
What other medicines interact with Ferrous fumarate?
MediHelp also lists interactions of Ferrous fumarate with, for example, Ciprofloxacin, Acetohydroxamic acid, Aluminum hydroxide. The full list is on the Ferrous fumarate page.
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