Drug interactions
Calcium acetate + Diltiazem
Severity: Minor
Calcium acetate and Diltiazem: minor 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
Calcium salts can reduce the effect of calcium channel blockers, mainly when given parenterally or when serum calcium rises substantially. Oral calcium acetate used as a phosphate binder is unlikely to cause meaningful loss of effect unless hypercalcemia develops.
What this interaction means in plain words
Calcium acetate and Diltiazem have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Calcium acetate belongs to Genitourinary; Diltiazem belongs to Cardiovascular.
Why it happens
Pharmacodynamic antagonism: raised extracellular calcium opposes L-type calcium channel blockade.
What to do
Monitor serum calcium and blood pressure or heart rate response in patients on calcium supplements or binders, and adjust the calcium dose if hypercalcemia develops.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Diltiazem
- Diltiazem + Flibanserin Contraindicated
- Diltiazem + Ivabradine Contraindicated
- Diltiazem + Lomitapide Contraindicated
- Diltiazem + Lonafarnib Contraindicated
- Acebutolol + Diltiazem Major
- Alfentanil + Diltiazem Major
Other interactions of Calcium acetate
Frequently asked questions
Can I take Calcium acetate with Diltiazem?
MediHelp rates the interaction as minor. Calcium acetate and Diltiazem have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Calcium salts can reduce the effect of calcium channel blockers, mainly when given parenterally or when serum calcium rises substantially. Oral calcium acetate used as a phosphate binder is unlikely to cause meaningful loss of effect unless hypercalcemia develops.
How serious is the interaction between Calcium acetate and Diltiazem?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum calcium and blood pressure or heart rate response in patients on calcium supplements or binders, and adjust the calcium dose if hypercalcemia develops.
What other medicines interact with Diltiazem?
MediHelp also lists interactions of Diltiazem with, for example, Flibanserin, Ivabradine, Lomitapide. The full list is on the Diltiazem page.
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