Drug interactions
Azithromycin + Siponimod
Severity: Major
Azithromycin and Siponimod: major 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
Siponimod can slow heart rate and affect cardiac conduction, and azithromycin prolongs the QT interval. Combined use may increase the risk of torsades de pointes, especially in patients with bradycardia.
What this interaction means in plain words
Azithromycin and Siponimod can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Azithromycin belongs to Anti Bacterial; Siponimod belongs to Central Nervous System.
Why it happens
Additive QTc prolongation, with siponimod-induced bradycardia increasing susceptibility to arrhythmia.
What to do
Avoid if possible and use a non-QT-prolonging antibiotic. If combined, obtain an ECG and monitor heart rate, with cardiology advice for high-risk patients.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Azithromycin
- Azithromycin + Cisapride Contraindicated
- Azithromycin + Domperidone Contraindicated
- Azithromycin + Dronedarone Contraindicated
- Azithromycin + Pimozide Contraindicated
- Azithromycin + Piperaquine Contraindicated
- Azithromycin + Thioridazine Contraindicated
Other interactions of Siponimod
- Cladribine + Siponimod Contraindicated
- Fingolimod + Siponimod Contraindicated
- Fluconazole + Siponimod Contraindicated
- Influenza virus vaccine quadrivalent intranasal + Siponimod Contraindicated
- Ponesimod + Siponimod Contraindicated
- Siponimod + Thioridazine Contraindicated
Frequently asked questions
Can I take Azithromycin with Siponimod?
MediHelp rates the interaction as major. Azithromycin and Siponimod can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Siponimod can slow heart rate and affect cardiac conduction, and azithromycin prolongs the QT interval. Combined use may increase the risk of torsades de pointes, especially in patients with bradycardia.
How serious is the interaction between Azithromycin and Siponimod?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid if possible and use a non-QT-prolonging antibiotic. If combined, obtain an ECG and monitor heart rate, with cardiology advice for high-risk patients.
What other medicines interact with Azithromycin?
MediHelp also lists interactions of Azithromycin with, for example, Cisapride, Domperidone, Dronedarone. The full list is on the Azithromycin page.
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