Drug interactions
Ibutilide + Siponimod
Severity: Major
Ibutilide 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
Ibutilide markedly prolongs the QT interval and carries a substantial risk of torsades de pointes. Siponimod slows heart rate and AV conduction at initiation, and bradycardia further increases proarrhythmic risk. The combination is hazardous.
What this interaction means in plain words
Ibutilide 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.
Ibutilide belongs to Cardiovascular; Siponimod belongs to Central Nervous System.
Why it happens
Additive QT prolongation with siponimod-induced bradycardia.
What to do
Avoid starting siponimod in patients receiving ibutilide or other class III antiarrhythmics; seek cardiology input and use ECG monitoring if no alternative exists. Ensure normal potassium and magnesium.
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 Siponimod
- Cladribine + Siponimod Contraindicated
- Fingolimod + Siponimod Contraindicated
- Fluconazole + Siponimod Contraindicated
- Influenza virus vaccine quadrivalent intranasal + Siponimod Contraindicated
- Ponesimod + Siponimod Contraindicated
- Siponimod + Thioridazine Contraindicated
Other interactions of Ibutilide
- Amiodarone + Ibutilide Contraindicated
- Amisulpride + Ibutilide Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Clarithromycin + Ibutilide Contraindicated
- Desipramine + Ibutilide Contraindicated
- Dolasetron + Ibutilide Contraindicated
Frequently asked questions
Can I take Ibutilide with Siponimod?
MediHelp rates the interaction as major. Ibutilide 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. Ibutilide markedly prolongs the QT interval and carries a substantial risk of torsades de pointes. Siponimod slows heart rate and AV conduction at initiation, and bradycardia further increases proarrhythmic risk. The combination is hazardous.
How serious is the interaction between Ibutilide 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 starting siponimod in patients receiving ibutilide or other class III antiarrhythmics; seek cardiology input and use ECG monitoring if no alternative exists. Ensure normal potassium and magnesium.
What other medicines interact with Siponimod?
MediHelp also lists interactions of Siponimod with, for example, Cladribine, Fingolimod, Fluconazole. The full list is on the Siponimod page.
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