NutriStack
Calcium Carbonate and Risedronate, a synergy.
Dietary calcium intake of around 1000-1200 mg/day is required for risedronate to fully build bone, but the calcium must not be taken at the same time as the drug. When properly separated, calcium and risedronate together produce better BMD and fracture outcomes than either alone.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Calcium Carbonate and Risedronate
- Pair type
- Synergy
- Evidence (highest tier)
- Strong
- Source citations
- 2 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Strong evidence
Synergy
What is happening. Dietary calcium intake of around 1000-1200 mg/day is required for risedronate to fully build bone, but the calcium must not be taken at the same time as the drug. When properly separated, calcium and risedronate together produce better BMD and fracture outcomes than either alone.
Mechanism. Calcium is the structural substrate for new bone matrix. Risedronate slows osteoclast-mediated resorption, but new bone formation by osteoblasts still depends on adequate calcium supply.
Recommendation. Aim for 1000-1200 mg/day total calcium from diet plus supplements, but take calcium supplements at least 60 minutes after the morning risedronate dose, or later in the day. Split supplemental calcium into 500 mg portions for best absorption.
Minimum separation. 60
Sources (2)
- Wiesner A, Szuta M, Galanty A, Paśko P. Optimal Dosing Regimen of Osteoporosis Drugs in Relation to Food Intake as the Key for the Enhancement of the Treatment Effectiveness-A Concise Literature Review. Foods. 2021;10(4):720. PMID 33805435
- Itoh A, Akagi Y, Shimomura H, Aoyama T. Interaction between Bisphosphonates and Mineral Water: Study of Oral Risedronate Absorption in Rats. Biol Pharm Bull. 2016;39(3):323-8. PMID 26934925
Stack Score
How this pair moves the number.
Effect on the composite score
If both Calcium Carbonate and Risedronate are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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