Drug General Information (ID: DDI9CG2NXS)
Drug Name			Calcium acetate		Drug Info		Risedronic acid		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Phosphate Binders				Bone Density Conservation Agents
Structure

Mechanism of Calcium acetate-Risedronic acid Interaction (Severity Level: Moderate)
Complex formation Click to Show/Hide Mechanism Graph
Drug Name		Calcium acetate				Risedronic acid
Mechanism		Polyvalent cations				Binds to polyvalent cations
Key Mechanism Factor 1
		Factor Name		Chelation
		Factor Description		Chelation is a direct drug interaction that usually involves the formation of dimers or trimers, resulting in larger complexes and poorer absorption.
Mechanism Description		Decreased absorption of Calcium acetate due to formation of complexes caused by Risedronic acid

Recommended Action
Management		Antacids or other oral medications containing aluminum, calcium, magnesium and other polyvalent cations should be administered at least 30 minutes after the bisphosphonate dose.

References
1	Product Information. Bonefos (clodronate). Rhone-Poulenc Rorer Canada Inc, Laval, QC.
2	Product Information. Boniva (ibandronate). Roche Laboratories, Nutley, NJ.
3	Product Information. Skelid (tilundronate). Sanofi Winthrop Pharmaceuticals, New York, NY.