Drug interactions
Siponimod + Sodium iodide i-131
Severity: Moderate
Siponimod and Sodium iodide i-131: 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
Radioiodine therapy at ablative doses can transiently suppress bone marrow, and siponimod lowers lymphocyte counts. Together they may modestly raise infection risk.
What this interaction means in plain words
Siponimod and Sodium iodide i-131 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.
Why it happens
Additive effects on blood counts: radiation-induced marrow suppression plus S1P receptor-mediated lymphocyte reduction.
What to do
Check blood counts after high-dose radioiodine therapy and monitor for infection. Consider temporarily holding siponimod if significant cytopenia develops.
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 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 Siponimod with Sodium iodide i-131?
MediHelp rates the interaction as moderate. Siponimod and Sodium iodide i-131 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. Radioiodine therapy at ablative doses can transiently suppress bone marrow, and siponimod lowers lymphocyte counts. Together they may modestly raise infection risk.
How serious is the interaction between Siponimod and Sodium iodide i-131?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check blood counts after high-dose radioiodine therapy and monitor for infection. Consider temporarily holding siponimod if significant cytopenia develops.
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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