Drug interactions
Siponimod + Strontium 89 chloride
Severity: Moderate
Siponimod and Strontium 89 chloride: 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
Strontium-89 is a bone-seeking radiopharmaceutical that causes delayed marrow suppression. Siponimod lowers lymphocytes, so the combination may increase infection risk.
What this interaction means in plain words
Siponimod and Strontium 89 chloride 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
Monitor complete blood counts for several weeks after strontium-89 dosing. Watch for infection and consider holding siponimod if cytopenias are severe.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Siponimod and Strontium 89 chloride, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
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 Strontium 89 chloride?
MediHelp rates the interaction as moderate. Siponimod and Strontium 89 chloride 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. Strontium-89 is a bone-seeking radiopharmaceutical that causes delayed marrow suppression. Siponimod lowers lymphocytes, so the combination may increase infection risk.
How serious is the interaction between Siponimod and Strontium 89 chloride?
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 complete blood counts for several weeks after strontium-89 dosing. Watch for infection and consider holding siponimod if cytopenias are severe.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
