Drug interactions
calcium + ciprofloxacin
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.
Overview
Calcium markedly reduces ciprofloxacin absorption, lowering systemic exposure and risking treatment failure.
Mechanism of action
Chelation of ciprofloxacin by divalent cations in the GI tract → nonabsorbable complexes → decreased bioavailability.
Clinical management
Avoid coadministration. Separate doses: give ciprofloxacin at least 2 hours before or 6 hours after calcium. Avoid taking ciprofloxacin with dairy/calcium-fortified juices alone. Monitor clinical response; in tube-fed patients, hold feeds 1–2 hours before/after.
Drug reference
References
- CIPRO (ciprofloxacin) Prescribing Information — FDA Label
- Ciprofloxacin: Drug Information — Lexicomp
Frequently asked questions
Can I take calcium with ciprofloxacin?
The interaction is rated: Moderate. Calcium markedly reduces ciprofloxacin absorption, lowering systemic exposure and risking treatment failure.
How serious is the interaction between calcium and ciprofloxacin?
The interaction is rated: Moderate. Evidence level: High.
How is the interaction between calcium and ciprofloxacin managed?
Avoid coadministration. Separate doses: give ciprofloxacin at least 2 hours before or 6 hours after calcium. Avoid taking ciprofloxacin with dairy/calcium-fortified juices alone. Monitor clinical response; in tube-fed patients, hold feeds 1–2 hours before/after.
Why do calcium and ciprofloxacin interact?
Chelation of ciprofloxacin by divalent cations in the GI tract → nonabsorbable complexes → decreased bioavailability.
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