Drug interactions
Siltuximab + Siponimod
Severity: Moderate
Siltuximab 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
Siltuximab blocks interleukin-6 and can mask fever and acute-phase responses while increasing infection risk. Siponimod also reduces lymphocyte counts, so the combination may increase susceptibility to infection and delay its recognition.
What this interaction means in plain words
Siltuximab 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.
Siltuximab belongs to Miscellaneous; Siponimod belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic immunosuppression through IL-6 blockade and S1P receptor-mediated lymphocyte sequestration.
What to do
Monitor closely for infection, bearing in mind that CRP and fever may be blunted by siltuximab. Treat active infections before starting and review the need for both drugs if infections occur.
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
Other interactions of Siltuximab
- Baricitinib + Siltuximab Major
- Atorvastatin + Siltuximab Moderate
- Carbamazepine + Siltuximab Moderate
- Cyclosporin + Siltuximab Moderate
- Ethinyl estradiol-drospirenone + Siltuximab Moderate
- Ethinyl estradiol-levonorgestrel + Siltuximab Moderate
Frequently asked questions
Can I take Siltuximab with Siponimod?
MediHelp rates the interaction as moderate. Siltuximab 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. Siltuximab blocks interleukin-6 and can mask fever and acute-phase responses while increasing infection risk. Siponimod also reduces lymphocyte counts, so the combination may increase susceptibility to infection and delay its recognition.
How serious is the interaction between Siltuximab 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 closely for infection, bearing in mind that CRP and fever may be blunted by siltuximab. Treat active infections before starting and review the need for both drugs if infections occur.
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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