Drug interactions
Pentostatin + Siponimod
Severity: Major
Pentostatin 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
Pentostatin causes profound and prolonged T-cell depletion and myelosuppression, and siponimod lowers lymphocyte counts. Combined use may substantially increase the risk of serious opportunistic infection.
What this interaction means in plain words
Pentostatin 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.
Pentostatin belongs to Oncology; Siponimod belongs to Central Nervous System.
Why it happens
Additive lymphocyte depletion: adenosine deaminase inhibition by pentostatin plus S1P-mediated sequestration.
What to do
Avoid concurrent use and consider holding siponimod during pentostatin therapy. If combined, monitor counts and infection closely.
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 Pentostatin
- Carmustine + Pentostatin Contraindicated
- Etoposide + Pentostatin Contraindicated
- Fludarabine + Pentostatin Contraindicated
- Cyclophosphamide + Pentostatin Major
- Deferiprone + Pentostatin Major
- Fingolimod + Pentostatin Major
Frequently asked questions
Can I take Pentostatin with Siponimod?
MediHelp rates the interaction as major. Pentostatin 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. Pentostatin causes profound and prolonged T-cell depletion and myelosuppression, and siponimod lowers lymphocyte counts. Combined use may substantially increase the risk of serious opportunistic infection.
How serious is the interaction between Pentostatin 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 concurrent use and consider holding siponimod during pentostatin therapy. If combined, monitor counts and infection closely.
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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