Is Calcium Safe with Risedronate?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Separate dosing according to formulation directions.
Why this interaction occurs
Calcium chelates risedronate in the GI tract and reduces oral bioavailability. For immediate-release risedronate, FDA labeling requires taking the dose at least 30 minutes before the first food, beverage, or other medication of the day. Delayed-release risedronate (Atelvia) has separate instructions — take immediately after breakfast with at least 4 oz of water; do not lie down for 30 minutes.
Evidence
Evidence level: strong.
Data source
FDA risedronate label
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 Calcium interactions → · All Risedronate interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.