Drug interactions
Siponimod + Thiotepa
Severity: Major
Siponimod and Thiotepa: 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
Thiotepa is a myelosuppressive alkylating agent, particularly at high conditioning doses. Siponimod lowers lymphocyte counts, so the combination may markedly increase infection risk.
What this interaction means in plain words
Siponimod and Thiotepa 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.
Siponimod belongs to Central Nervous System; Thiotepa belongs to Oncology.
Why it happens
Additive immunosuppression from cytotoxic myelosuppression and S1P receptor-mediated lymphocyte sequestration.
What to do
Monitor complete blood counts and infection closely. Consider withholding siponimod during myelosuppressive thiotepa treatment.
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
Other interactions of Thiotepa
- Bendamustine + Thiotepa Major
- Chlorambucil + Thiotepa Major
- Clarithromycin + Thiotepa Major
- Cyclophosphamide + Thiotepa Major
- Dacarbazine + Thiotepa Major
- Deferiprone + Thiotepa Major
Frequently asked questions
Can I take Siponimod with Thiotepa?
MediHelp rates the interaction as major. Siponimod and Thiotepa 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. Thiotepa is a myelosuppressive alkylating agent, particularly at high conditioning doses. Siponimod lowers lymphocyte counts, so the combination may markedly increase infection risk.
How serious is the interaction between Siponimod and Thiotepa?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor complete blood counts and infection closely. Consider withholding siponimod during myelosuppressive thiotepa 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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