Drug interactions
Paclitaxel + Siponimod
Severity: Moderate
Paclitaxel 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
Paclitaxel commonly causes neutropenia, and siponimod lowers lymphocytes, so infection risk may be increased. Paclitaxel is also a CYP2C8 substrate, which has minor relevance to siponimod metabolism via CYP2C9.
What this interaction means in plain words
Paclitaxel 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.
Paclitaxel belongs to Oncology; Siponimod belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic effects: chemotherapy-induced myelosuppression plus S1P-mediated lymphocyte reduction.
What to do
Monitor complete blood counts and for infection during co-therapy. Consider holding siponimod if severe neutropenia or lymphopenia occurs.
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
Other interactions of Paclitaxel
Frequently asked questions
Can I take Paclitaxel with Siponimod?
MediHelp rates the interaction as moderate. Paclitaxel 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. Paclitaxel commonly causes neutropenia, and siponimod lowers lymphocytes, so infection risk may be increased. Paclitaxel is also a CYP2C8 substrate, which has minor relevance to siponimod metabolism via CYP2C9.
How serious is the interaction between Paclitaxel 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: Monitor complete blood counts and for infection during co-therapy. Consider holding siponimod if severe neutropenia or lymphopenia occurs.
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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