Drug interactions
Bcg vaccine live + Siponimod
Severity: Major
Bcg vaccine live and Siponimod: major 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
BCG is a live attenuated vaccine, and in immunosuppressed patients it may cause disseminated BCG infection. Siponimod reduces lymphocyte function and numbers, which increases this risk and may blunt the response.
What this interaction means in plain words
Bcg vaccine live and Siponimod can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
S1P receptor modulation sequesters lymphocytes in lymphoid tissue, producing immunosuppression that permits live vaccine replication.
What to do
Avoid live BCG during siponimod treatment and for 4 weeks after stopping it. Give any required live vaccine at least 1 week before starting siponimod, and longer if possible.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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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 Bcg vaccine live with Siponimod?
MediHelp rates the interaction as major. Bcg vaccine live and Siponimod can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. BCG is a live attenuated vaccine, and in immunosuppressed patients it may cause disseminated BCG infection. Siponimod reduces lymphocyte function and numbers, which increases this risk and may blunt the response.
How serious is the interaction between Bcg vaccine live and Siponimod?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid live BCG during siponimod treatment and for 4 weeks after stopping it. Give any required live vaccine at least 1 week before starting siponimod, and longer if possible.
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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