Drug interactions
Calcium citrate + Risedronate
Severity: Moderate
Calcium citrate 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
Oral calcium salts bind risedronate in the gut and substantially reduce its absorption. This can reduce the bone-protective effect of the bisphosphonate.
What this interaction means in plain words
Calcium citrate 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.
Why it happens
Chelation of risedronate by divalent calcium cations in the gastrointestinal tract, reducing absorption.
What to do
Take risedronate at least 30 minutes before calcium citrate, on an empty stomach with plain water. Calcium supplements are 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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Calcium citrate and Risedronate, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Risedronate
- Aluminum hydroxide + Risedronate Moderate
- Calcium acetate + Risedronate Moderate
- Calcium carbonate + Risedronate Moderate
- Calcium chloride + Risedronate Moderate
- Calcium gluconate + Risedronate Moderate
- Calcium + Risedronate Moderate
Frequently asked questions
Can I take Calcium citrate with Risedronate?
MediHelp rates the interaction as moderate. Calcium citrate 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. Oral calcium salts bind risedronate in the gut and substantially reduce its absorption. This can reduce the bone-protective effect of the bisphosphonate.
How serious is the interaction between Calcium citrate 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 at least 30 minutes before calcium citrate, on an empty stomach with plain water. Calcium supplements are best taken later in the day.
What other medicines interact with Risedronate?
MediHelp also lists interactions of Risedronate with, for example, Aluminum hydroxide, Calcium acetate, Calcium carbonate. The full list is on the Risedronate page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
