Drug interactions
Ciprofloxacin + Magnesium sulfate
Severity: Moderate
Ciprofloxacin and Magnesium sulfate: 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
Oral magnesium sulfate can bind ciprofloxacin in the gut and lower its absorption. Intravenous magnesium sulfate does not cause this chelation, so the interaction concerns oral use only.
What this interaction means in plain words
Ciprofloxacin and Magnesium sulfate 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 oral ciprofloxacin by magnesium cations in the gastrointestinal tract.
What to do
If oral magnesium sulfate is used, give oral ciprofloxacin at least 2 hours before or 6 hours after it. No separation is needed for intravenous magnesium.
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 sulfate?
MediHelp rates the interaction as moderate. Ciprofloxacin and Magnesium sulfate 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. Oral magnesium sulfate can bind ciprofloxacin in the gut and lower its absorption. Intravenous magnesium sulfate does not cause this chelation, so the interaction concerns oral use only.
How serious is the interaction between Ciprofloxacin and Magnesium sulfate?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: If oral magnesium sulfate is used, give oral ciprofloxacin at least 2 hours before or 6 hours after it. No separation is needed for intravenous magnesium.
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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