Drug interactions
Ofatumumab + Siponimod
Severity: Major
Ofatumumab 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
Ofatumumab depletes B cells and siponimod reduces circulating lymphocytes, so together they can add to the risk of infections. The effect of ofatumumab persists for months after the last dose.
What this interaction means in plain words
Ofatumumab 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.
Ofatumumab belongs to Miscellaneous; Siponimod belongs to Central Nervous System.
Why it happens
Additive immunosuppression from anti-CD20 B-cell depletion and S1P receptor-mediated lymphocyte sequestration.
What to do
Avoid concurrent use where possible. When switching, account for the prolonged B-cell depletion of ofatumumab and monitor for infection and lymphocyte counts.
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 Ofatumumab
- Fingolimod + Ofatumumab Major
- Lomustine + Ofatumumab Major
- Denosumab + Ofatumumab Moderate
Frequently asked questions
Can I take Ofatumumab with Siponimod?
MediHelp rates the interaction as major. Ofatumumab 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. Ofatumumab depletes B cells and siponimod reduces circulating lymphocytes, so together they can add to the risk of infections. The effect of ofatumumab persists for months after the last dose.
How serious is the interaction between Ofatumumab 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. When switching, account for the prolonged B-cell depletion of ofatumumab and monitor for infection and lymphocyte counts.
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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