Drug interactions
Ciprofloxacin + Magnesium sulphate
Severity: Moderate
Ciprofloxacin and Magnesium sulphate: 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-containing products bind ciprofloxacin in the gut and markedly reduce its absorption, potentially causing treatment failure. Intravenous magnesium does not cause this interaction.
What this interaction means in plain words
Ciprofloxacin and Magnesium sulphate 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.
Ciprofloxacin belongs to Anti Bacterial; Magnesium sulphate belongs to Cardiovascular.
Why it happens
Chelation of ciprofloxacin by divalent magnesium cations in the gastrointestinal tract forms poorly absorbed complexes.
What to do
Give oral ciprofloxacin at least 2 hours before or 6 hours after oral magnesium. Use an alternative if separation is not feasible.
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 Magnesium sulphate
- Amikacin + Magnesium sulphate Moderate
- Amphotericin b deoxycholate + Magnesium sulphate Moderate
- Atracurium + Magnesium sulphate Moderate
- Baloxavir marboxil + Magnesium sulphate Moderate
- Cisatracurium + Magnesium sulphate Moderate
- Delafloxacin + Magnesium sulphate Moderate
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 sulphate?
MediHelp rates the interaction as moderate. Ciprofloxacin and Magnesium sulphate 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-containing products bind ciprofloxacin in the gut and markedly reduce its absorption, potentially causing treatment failure. Intravenous magnesium does not cause this interaction.
How serious is the interaction between Ciprofloxacin and Magnesium sulphate?
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 oral ciprofloxacin at least 2 hours before or 6 hours after oral magnesium. Use an alternative if separation is not feasible.
What other medicines interact with Magnesium sulphate?
MediHelp also lists interactions of Magnesium sulphate with, for example, Amikacin, Amphotericin b deoxycholate, Atracurium. The full list is on the Magnesium sulphate page.
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