Drug interactions
Obinutuzumab + Siponimod
Severity: Major
Obinutuzumab 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
Obinutuzumab is an anti-CD20 antibody causing profound B-cell depletion and neutropenia, with risk of serious infection including hepatitis B reactivation and PML. Adding siponimod further impairs immunity and increases infection risk.
What this interaction means in plain words
Obinutuzumab 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.
Obinutuzumab belongs to Oncology; Siponimod belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic immunosuppression: B-cell depletion plus S1P-mediated lymphocyte sequestration.
What to do
Avoid concurrent use where possible; monitor lymphocyte and neutrophil counts and for infection, and screen for hepatitis B before anti-CD20 therapy.
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 Obinutuzumab
Frequently asked questions
Can I take Obinutuzumab with Siponimod?
MediHelp rates the interaction as major. Obinutuzumab 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. Obinutuzumab is an anti-CD20 antibody causing profound B-cell depletion and neutropenia, with risk of serious infection including hepatitis B reactivation and PML. Adding siponimod further impairs immunity and increases infection risk.
How serious is the interaction between Obinutuzumab 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 concurrent use where possible; monitor lymphocyte and neutrophil counts and for infection, and screen for hepatitis B before anti-CD20 therapy.
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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