Drug interactions
Calcium carbonate + Etidronate
Severity: Moderate
Calcium carbonate and Etidronate: 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 ions bind oral etidronate in the gut and form poorly absorbed complexes. Etidronate absorption is already low, so bone benefit can be reduced further.
What this interaction means in plain words
Calcium carbonate and Etidronate 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 carbonate belongs to Gastrointestinal Tract; Etidronate belongs to Musculoskeletal.
Why it happens
Chelation of etidronate by calcium in the gastrointestinal tract reduces its absorption.
What to do
Give etidronate on an empty stomach and keep calcium products at least 2 hours away from the dose, or follow the product label interval.
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 Calcium carbonate
Other interactions of Etidronate
- Aluminum hydroxide + Etidronate Moderate
- Calcium acetate + Etidronate Moderate
- Calcium chloride + Etidronate Moderate
- Calcium citrate + Etidronate Moderate
- Calcium gluconate + Etidronate Moderate
- Calcium + Etidronate Moderate
Frequently asked questions
Can I take Calcium carbonate with Etidronate?
MediHelp rates the interaction as moderate. Calcium carbonate and Etidronate 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 ions bind oral etidronate in the gut and form poorly absorbed complexes. Etidronate absorption is already low, so bone benefit can be reduced further.
How serious is the interaction between Calcium carbonate and Etidronate?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Give etidronate on an empty stomach and keep calcium products at least 2 hours away from the dose, or follow the product label interval.
What other medicines interact with Calcium carbonate?
MediHelp also lists interactions of Calcium carbonate with, for example, Acalabrutinib, Alendronate, Amlodipine-hydrochlorothiazide-valsartan. The full list is on the Calcium carbonate page.
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