Drug interactions
Nitisinone + Siponimod
Severity: Moderate
Nitisinone 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
Nitisinone is a moderate CYP2C9 inhibitor and may increase siponimod exposure. Coadministration with a CYP3A4 inhibitor would raise exposure further, so this is a concern mainly in the presence of additional inhibitors.
What this interaction means in plain words
Nitisinone 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.
Nitisinone belongs to Miscellaneous; Siponimod belongs to Central Nervous System.
Why it happens
Inhibition of CYP2C9 decreases the main clearance pathway of siponimod.
What to do
Avoid adding a moderate or strong CYP3A4 inhibitor. Monitor heart rate and lymphocyte count when initiating the combination.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Nitisinone and Siponimod, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
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 Nitisinone
- Adefovir + Nitisinone Moderate
- Bosentan + Nitisinone Moderate
- Celecoxib + Nitisinone Moderate
- Chlorpropamide + Nitisinone Moderate
- Diclofenac + Nitisinone Moderate
- Fluvastatin + Nitisinone Moderate
Frequently asked questions
Can I take Nitisinone with Siponimod?
MediHelp rates the interaction as moderate. Nitisinone 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. Nitisinone is a moderate CYP2C9 inhibitor and may increase siponimod exposure. Coadministration with a CYP3A4 inhibitor would raise exposure further, so this is a concern mainly in the presence of additional inhibitors.
How serious is the interaction between Nitisinone 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: Avoid adding a moderate or strong CYP3A4 inhibitor. Monitor heart rate and lymphocyte count when initiating the combination.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
