Drug interactions
Ciprofloxacin + Magnesium supplement
Severity: Moderate
Ciprofloxacin and Magnesium supplement: moderate 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
Magnesium binds ciprofloxacin in the gut and markedly reduces its absorption. This can lead to subtherapeutic antibiotic levels and treatment failure or resistance.
What this interaction means in plain words
Ciprofloxacin and Magnesium supplement can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Chelation of ciprofloxacin by divalent magnesium cations forms insoluble complexes in the gastrointestinal tract.
What to do
Give ciprofloxacin at least 2 hours before or 6 hours after the magnesium supplement.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Ciprofloxacin
- Agomelatine + Ciprofloxacin Contraindicated
- Ciprofloxacin + Fezolinetant Contraindicated
- Ciprofloxacin + Thioridazine Contraindicated
- Ciprofloxacin + Tizanidine Contraindicated
- Ciprofloxacin + Vandetanib Contraindicated
- Alosetron + Ciprofloxacin Major
Frequently asked questions
Can I take Ciprofloxacin with Magnesium supplement?
MediHelp rates the interaction as moderate. Ciprofloxacin and Magnesium supplement can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Magnesium binds ciprofloxacin in the gut and markedly reduces its absorption. This can lead to subtherapeutic antibiotic levels and treatment failure or resistance.
How serious is the interaction between Ciprofloxacin and Magnesium supplement?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Give ciprofloxacin at least 2 hours before or 6 hours after the magnesium supplement.
What other medicines interact with Ciprofloxacin?
MediHelp also lists interactions of Ciprofloxacin with, for example, Agomelatine, Fezolinetant, Thioridazine. The full list is on the Ciprofloxacin page.
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