Drug interactions
Haemophilus influenzae type b vaccine + Siponimod
Severity: Moderate
Haemophilus influenzae type b vaccine 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
Siponimod lowers circulating lymphocytes and can blunt antibody responses to vaccines. A non-live vaccine such as Hib is safe but may be less effective during treatment. Vaccination ideally is completed before treatment begins.
What this interaction means in plain words
Haemophilus influenzae type b vaccine 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.
Why it happens
Sphingosine-1-phosphate receptor modulation traps lymphocytes in lymphoid tissue, reducing vaccine immune response.
What to do
Complete needed vaccinations at least 1 week before starting siponimod where possible, or defer them until about 4 weeks after stopping. If vaccinated during therapy, consider that protection may be reduced.
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 Haemophilus influenzae type b vaccine with Siponimod?
MediHelp rates the interaction as moderate. Haemophilus influenzae type b vaccine 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. Siponimod lowers circulating lymphocytes and can blunt antibody responses to vaccines. A non-live vaccine such as Hib is safe but may be less effective during treatment. Vaccination ideally is completed before treatment begins.
How serious is the interaction between Haemophilus influenzae type b vaccine 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: Complete needed vaccinations at least 1 week before starting siponimod where possible, or defer them until about 4 weeks after stopping. If vaccinated during therapy, consider that protection may be reduced.
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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