Drug interactions
Interferon beta 1b + Siponimod
Severity: Moderate
Interferon beta 1b 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
Both drugs modulate the immune system, so concurrent use may add to immunosuppression and the risk of infection. Siponimod is generally started right after stopping interferon beta because of its short immune effect.
What this interaction means in plain words
Interferon beta 1b 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.
Interferon beta 1b belongs to Central Nervous System; Siponimod belongs to Central Nervous System.
Why it happens
Additive immunomodulatory effects, with siponimod reducing circulating lymphocytes.
What to do
Avoid planned overlap; when switching, siponimod can be started after stopping interferon beta, and monitor for infection and lymphocyte counts.
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 Interferon beta 1b
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 Interferon beta 1b with Siponimod?
MediHelp rates the interaction as moderate. Interferon beta 1b 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. Both drugs modulate the immune system, so concurrent use may add to immunosuppression and the risk of infection. Siponimod is generally started right after stopping interferon beta because of its short immune effect.
How serious is the interaction between Interferon beta 1b 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: Avoid planned overlap; when switching, siponimod can be started after stopping interferon beta, and monitor for infection and lymphocyte counts.
What other medicines interact with Interferon beta 1b?
MediHelp also lists interactions of Interferon beta 1b with, for example, Axicabtagene ciloleucel, Brexucabtagene autoleucel, Ciltacabtagene autoleucel. The full list is on the Interferon beta 1b page.
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