Drug interactions
Siponimod + Vorinostat
Severity: Major
Siponimod and Vorinostat: 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
Both agents can prolong the QT interval, and siponimod also slows heart rate at treatment initiation. Used together they may raise the risk of serious ventricular arrhythmias such as torsades de pointes, particularly if electrolytes are disturbed.
What this interaction means in plain words
Siponimod and Vorinostat 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 belongs to Central Nervous System; Vorinostat belongs to Oncology.
Why it happens
Additive pharmacodynamic QT prolongation, with siponimod-related bradycardia adding to arrhythmic risk.
What to do
Prefer an alternative where possible; if both are needed, obtain a baseline ECG, correct potassium and magnesium, and monitor the ECG during treatment. Seek cardiology advice before starting siponimod in patients with existing QT risk.
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 Vorinostat
- Thioridazine + Vorinostat Contraindicated
- Amiodarone + Vorinostat Major
- Amisulpride + Vorinostat Major
- Anagrelide + Vorinostat Major
- Asenapine + Vorinostat Major
- Chlorpromazine + Vorinostat Major
Frequently asked questions
Can I take Siponimod with Vorinostat?
MediHelp rates the interaction as major. Siponimod and Vorinostat 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. Both agents can prolong the QT interval, and siponimod also slows heart rate at treatment initiation. Used together they may raise the risk of serious ventricular arrhythmias such as torsades de pointes, particularly if electrolytes are disturbed.
How serious is the interaction between Siponimod and Vorinostat?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Prefer an alternative where possible; if both are needed, obtain a baseline ECG, correct potassium and magnesium, and monitor the ECG during treatment. Seek cardiology advice before starting siponimod in patients with existing QT risk.
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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