Drug interactions
Propafenone + Siponimod
Severity: Major
Propafenone and Siponimod: major interaction.
Last updated Sources: Health Canada product monograph
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 propafenone slows conduction and may prolong the QT interval. Together they raise the risk of bradycardia, conduction block and ventricular arrhythmia.
What this interaction means in plain words
Propafenone 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.
Propafenone belongs to Cardiovascular; Siponimod belongs to Central Nervous System.
Why it happens
Additive effects on cardiac conduction, heart rate and repolarisation (pharmacodynamic).
What to do
Avoid the combination where possible; if siponimod is needed, obtain cardiology advice and ECG before starting with monitoring after the first dose.
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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References
Other interactions of Propafenone
- Dofetilide + Propafenone Contraindicated
- Dronedarone + Propafenone Contraindicated
- Nilotinib + Propafenone Contraindicated
- Nirmatrelvir / ritonavir + Propafenone Contraindicated
- Nirmatrelvir + Propafenone Contraindicated
- Pimozide + Propafenone 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 Propafenone with Siponimod?
MediHelp rates the interaction as major. Propafenone 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 propafenone slows conduction and may prolong the QT interval. Together they raise the risk of bradycardia, conduction block and ventricular arrhythmia.
How serious is the interaction between Propafenone 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 the combination where possible; if siponimod is needed, obtain cardiology advice and ECG before starting with monitoring after the first dose.
What other medicines interact with Propafenone?
MediHelp also lists interactions of Propafenone with, for example, Dofetilide, Dronedarone, Nilotinib. The full list is on the Propafenone page.
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