Drug interactions
Calcium carbonate + Risedronate
Severity: Moderate
Calcium carbonate and Risedronate: 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 greatly reduces the oral absorption of risedronate, which can decrease its bone-protective effect if taken together.
What this interaction means in plain words
Calcium carbonate and Risedronate 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; Risedronate belongs to Musculoskeletal.
Why it happens
Calcium chelates risedronate in the gut forming poorly absorbed complexes.
What to do
Take risedronate on an empty stomach with plain water and wait at least 30 minutes before calcium; per labeling, calcium is best taken later in the day.
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 Risedronate
- Aluminum hydroxide + Risedronate Moderate
- Calcium acetate + Risedronate Moderate
- Calcium chloride + Risedronate Moderate
- Calcium citrate + Risedronate Moderate
- Calcium gluconate + Risedronate Moderate
- Calcium + Risedronate Moderate
Frequently asked questions
Can I take Calcium carbonate with Risedronate?
MediHelp rates the interaction as moderate. Calcium carbonate and Risedronate 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 greatly reduces the oral absorption of risedronate, which can decrease its bone-protective effect if taken together.
How serious is the interaction between Calcium carbonate and Risedronate?
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 risedronate on an empty stomach with plain water and wait at least 30 minutes before calcium; per labeling, calcium is best taken later in the day.
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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