Drug interactions
Ponesimod + Rituximab
Severity: Moderate
Ponesimod and Rituximab: 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 causes prolonged B-cell depletion and ponesimod reduces circulating lymphocytes, so combined use may increase the risk of infection. The effects persist after either drug is stopped.
What this interaction means in plain words
Ponesimod and Rituximab 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.
Ponesimod belongs to Central Nervous System; Rituximab belongs to Musculoskeletal.
Why it happens
Additive immunosuppression through B-cell depletion and S1P receptor-mediated lymphocyte sequestration.
What to do
Monitor for infection and lymphocyte counts. Allow for the prolonged immune effect of rituximab when sequencing therapies.
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 Ponesimod
- Fingolimod + Ponesimod Contraindicated
- Ponesimod + Siponimod Contraindicated
- Amiodarone + Ponesimod Major
- Amisulpride + Ponesimod Major
- Anagrelide + Ponesimod Major
- Anti-thymocyte + Ponesimod Major
Frequently asked questions
Can I take Ponesimod with Rituximab?
MediHelp rates the interaction as moderate. Ponesimod and Rituximab 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 causes prolonged B-cell depletion and ponesimod reduces circulating lymphocytes, so combined use may increase the risk of infection. The effects persist after either drug is stopped.
How serious is the interaction between Ponesimod and Rituximab?
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. Allow for the prolonged immune effect of rituximab when sequencing therapies.
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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