Drug interactions
Hepatitis a / b vaccine + Siponimod
Severity: Moderate
Hepatitis a / 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 reduces lymphocyte availability and can diminish antibody responses to inactivated vaccines. The combined hepatitis A/B vaccine is not harmful but may give weaker protection. Timing around siponimod therapy matters.
What this interaction means in plain words
Hepatitis a / 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
S1P receptor modulation sequesters lymphocytes and impairs vaccine immune response.
What to do
Vaccinate at least 1 week before starting siponimod when possible, or postpone until about 4 weeks after discontinuation. Consider checking serology if vaccinated during treatment.
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 Hepatitis a / b vaccine with Siponimod?
MediHelp rates the interaction as moderate. Hepatitis a / 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 reduces lymphocyte availability and can diminish antibody responses to inactivated vaccines. The combined hepatitis A/B vaccine is not harmful but may give weaker protection. Timing around siponimod therapy matters.
How serious is the interaction between Hepatitis a / 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: Vaccinate at least 1 week before starting siponimod when possible, or postpone until about 4 weeks after discontinuation. Consider checking serology if vaccinated during treatment.
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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