Is Iron Safe with Risedronate?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Take risedronate at least 30 minutes before any other supplement, food, or beverage. Iron supplements should be spaced at least 2 hours away from risedronate dosing.
Why this interaction occurs
Iron's polyvalent cationic nature allows it to chelate risedronate's bisphosphonate backbone in the GI lumen. This reduces risedronate's already low oral bioavailability (~0.63%), making timing separation critically important for maintaining therapeutic efficacy.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 17,651 reports mentioning Risedronate. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Risedronate + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Iron interactions → · All Risedronate interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.