Calcium and Ciprofloxacin: Drug Interaction Guide

Quick answer: This combination requires caution. Calcium and Ciprofloxacin can be used together with adjustments and monitoring.

Interaction severity: Moderate — caution required

How Calcium interacts with Ciprofloxacin

Divalent cations such as calcium chelate fluoroquinolones in the gut, reducing ciprofloxacin oral bioavailability by up to 50% and causing treatment failure.

What you should do

Separate administration by at least 2 hours before, or 6 hours after, calcium-containing products, dairy, antacids, and iron supplements.

Key facts

Severity

Moderate — caution required

Mechanism

Divalent cations such as calcium chelate fluoroquinolones in the gut, reducing ciprofloxacin oral bioavailability by up ...

Action

Separate administration by at least 2 hours before, or 6 hours after, calcium-containing products, dairy, antacids, and ...

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Calcium and Ciprofloxacin together?

With caution. Separate administration by at least 2 hours before, or 6 hours after, calcium-containing products, dairy, antacids, and iron supplements.

What is the severity of this interaction?

The interaction between Calcium and Ciprofloxacin is classified as Moderate — caution required. Divalent cations such as calcium chelate fluoroquinolones in the gut, reducing ciprofloxacin oral bioavailability by up to 50% and causing treatment failure.

What should I do if I'm prescribed both?

Separate administration by at least 2 hours before, or 6 hours after, calcium-containing products, dairy, antacids, and iron supplements. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.