Drug interactions
Magnesium supplement + Risedronate
Severity: Moderate
Magnesium supplement 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 magnesium binds risedronate in the gut and reduces its absorption, which can blunt its effect on bone. Risedronate has very low bioavailability to begin with.
What this interaction means in plain words
Magnesium supplement 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 magnesium cations in the gastrointestinal tract reduces absorption.
What to do
Take risedronate fasting with plain water, at least 30 minutes before magnesium products, or take magnesium 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 Risedronate
- Aluminum hydroxide + Risedronate Moderate
- Calcium acetate + Risedronate Moderate
- Calcium carbonate + Risedronate Moderate
- Calcium chloride + Risedronate Moderate
- Calcium citrate + Risedronate Moderate
- Calcium gluconate + Risedronate Moderate
Frequently asked questions
Can I take Magnesium supplement with Risedronate?
MediHelp rates the interaction as moderate. Magnesium supplement 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 magnesium binds risedronate in the gut and reduces its absorption, which can blunt its effect on bone. Risedronate has very low bioavailability to begin with.
How serious is the interaction between Magnesium supplement 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 fasting with plain water, at least 30 minutes before magnesium products, or take magnesium 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.
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