Drug interactions
Rituximab + Siponimod
Severity: Moderate
Rituximab and Siponimod: moderate 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
Rituximab depletes B cells for months and siponimod lowers circulating lymphocytes, so the combination may add to infection risk. Immune effects remain after discontinuation of either drug.
What this interaction means in plain words
Rituximab and Siponimod can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Rituximab belongs to Musculoskeletal; Siponimod belongs to Central Nervous System.
Why it happens
Additive immunosuppression through B-cell depletion and S1P receptor-mediated lymphocyte sequestration.
What to do
Monitor for infection and lymphocyte counts. Consider the long duration of rituximab effect when starting siponimod.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Rituximab
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 Rituximab with Siponimod?
MediHelp rates the interaction as moderate. Rituximab and Siponimod can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Rituximab depletes B cells for months and siponimod lowers circulating lymphocytes, so the combination may add to infection risk. Immune effects remain after discontinuation of either drug.
How serious is the interaction between Rituximab and Siponimod?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for infection and lymphocyte counts. Consider the long duration of rituximab effect when starting siponimod.
What other medicines interact with Rituximab?
MediHelp also lists interactions of Rituximab with, for example, Adenovirus types 4 and 7 live, Baricitinib, Certolizumab pegol. The full list is on the Rituximab page.
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