Drug interactions
Ruxolitinib + Siponimod
Severity: Major
Ruxolitinib 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
Ruxolitinib is a JAK inhibitor that causes cytopenias and increases susceptibility to infections, including opportunistic and viral infections. Siponimod reduces lymphocyte counts and may add to that risk.
What this interaction means in plain words
Ruxolitinib 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.
Ruxolitinib belongs to Oncology; Siponimod belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic immunosuppression: JAK inhibition and myelosuppression plus S1P-mediated lymphocyte sequestration.
What to do
Avoid combining where an alternative exists; if used together, monitor blood counts and for infection, including herpes zoster and opportunistic infections.
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 Ruxolitinib
Frequently asked questions
Can I take Ruxolitinib with Siponimod?
MediHelp rates the interaction as major. Ruxolitinib 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. Ruxolitinib is a JAK inhibitor that causes cytopenias and increases susceptibility to infections, including opportunistic and viral infections. Siponimod reduces lymphocyte counts and may add to that risk.
How serious is the interaction between Ruxolitinib 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 combining where an alternative exists; if used together, monitor blood counts and for infection, including herpes zoster and opportunistic infections.
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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