Drug interactions
Siponimod + Sorafenib
Severity: Major
Siponimod and Sorafenib: 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
Sorafenib inhibits CYP2C9 and may raise siponimod exposure, and both drugs can prolong the QT interval. Siponimod also slows heart rate, so arrhythmia risk is increased.
What this interaction means in plain words
Siponimod and Sorafenib 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; Sorafenib belongs to Oncology.
Why it happens
CYP2C9 inhibition by sorafenib reduces siponimod clearance, combined with additive QT prolongation.
What to do
Avoid if an alternative exists. If used together, obtain a baseline ECG, correct potassium and magnesium, and monitor ECG and heart rate.
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 Sorafenib
Frequently asked questions
Can I take Siponimod with Sorafenib?
MediHelp rates the interaction as major. Siponimod and Sorafenib 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. Sorafenib inhibits CYP2C9 and may raise siponimod exposure, and both drugs can prolong the QT interval. Siponimod also slows heart rate, so arrhythmia risk is increased.
How serious is the interaction between Siponimod and Sorafenib?
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 an alternative exists. If used together, obtain a baseline ECG, correct potassium and magnesium, and monitor ECG and heart rate.
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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