Drug interactions
Siponimod + Tofacitinib
Severity: Major
Siponimod and Tofacitinib: 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 drugs reduce immune function, so combining them may increase the risk of serious infections. Siponimod lowers circulating lymphocytes, and the effect persists for some time after stopping.
What this interaction means in plain words
Siponimod and Tofacitinib 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; Tofacitinib belongs to Musculoskeletal.
Why it happens
Additive immunosuppression: siponimod sequesters lymphocytes in lymphoid tissue while tofacitinib inhibits JAK-mediated cytokine signaling.
What to do
Avoid the combination where possible, and monitor lymphocyte and neutrophil counts and for signs of infection if both are needed. Allow for the lingering effect of siponimod when switching therapies.
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 Tofacitinib
- Baricitinib + Tofacitinib Contraindicated
- Cladribine + Tofacitinib Contraindicated
- Tofacitinib + Upadacitinib Contraindicated
- Abatacept + Tofacitinib Major
- Anti-thymocyte + Tofacitinib Major
- Antithymocyte globulin equine + Tofacitinib Major
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 Siponimod with Tofacitinib?
MediHelp rates the interaction as major. Siponimod and Tofacitinib 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 drugs reduce immune function, so combining them may increase the risk of serious infections. Siponimod lowers circulating lymphocytes, and the effect persists for some time after stopping.
How serious is the interaction between Siponimod and Tofacitinib?
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, and monitor lymphocyte and neutrophil counts and for signs of infection if both are needed. Allow for the lingering effect of siponimod when switching therapies.
What other medicines interact with Tofacitinib?
MediHelp also lists interactions of Tofacitinib with, for example, Baricitinib, Cladribine, Upadacitinib. The full list is on the Tofacitinib page.
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