Drug interactions
Calcium citrate + Iron
Severity: Moderate
Calcium citrate and Iron: moderate 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. Over time this may blunt the response to iron treatment.
What this interaction means in plain words
Calcium citrate and Iron can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Calcium competes with iron for intestinal absorption through shared uptake pathways.
What to do
Take iron and calcium supplements at least 2 hours apart, and check hemoglobin and iron indices if therapy is prolonged.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Iron
- Acetohydroxamic acid + Iron Moderate
- Aluminum hydroxide + Iron Moderate
- Baloxavir marboxil + Iron Moderate
- Calcium acetate + Iron Moderate
- Calcium carbonate + Iron Moderate
- Carbidopa + Iron Moderate
Frequently asked questions
Can I take Calcium citrate with Iron?
MediHelp rates the interaction as moderate. Calcium citrate and Iron can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Calcium citrate taken with oral iron can reduce iron absorption. Over time this may blunt the response to iron treatment.
How serious is the interaction between Calcium citrate and Iron?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Take iron and calcium supplements at least 2 hours apart, and check hemoglobin and iron indices if therapy is prolonged.
What other medicines interact with Iron?
MediHelp also lists interactions of Iron with, for example, Acetohydroxamic acid, Aluminum hydroxide, Baloxavir marboxil. The full list is on the Iron page.
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