Drug interactions
Itraconazole + Siponimod
Severity: Major
Itraconazole 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
Itraconazole inhibits CYP3A4 and may raise siponimod exposure, especially in patients with reduced CYP2C9 activity. Both drugs can also affect cardiac conduction and QT interval, with siponimod causing bradycardia on initiation.
What this interaction means in plain words
Itraconazole 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.
Itraconazole belongs to Anti Fungals; Siponimod belongs to Central Nervous System.
Why it happens
Itraconazole inhibits CYP3A4, reducing siponimod metabolism, with additive effects on cardiac conduction/repolarization.
What to do
Avoid combining where possible and choose a non-CYP3A4-inhibiting antifungal. If unavoidable, obtain an ECG and monitor heart rate and QT, and review the siponimod dose per CYP2C9 genotype.
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 Itraconazole
- Alfuzosin + Itraconazole Contraindicated
- Alprazolam + Itraconazole Contraindicated
- Avanafil + Itraconazole Contraindicated
- Conivaptan + Itraconazole Contraindicated
- Dihydroergotamine intranasal + Itraconazole Contraindicated
- Dihydroergotamine + Itraconazole Contraindicated
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 Itraconazole with Siponimod?
MediHelp rates the interaction as major. Itraconazole 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. Itraconazole inhibits CYP3A4 and may raise siponimod exposure, especially in patients with reduced CYP2C9 activity. Both drugs can also affect cardiac conduction and QT interval, with siponimod causing bradycardia on initiation.
How serious is the interaction between Itraconazole 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 combining where possible and choose a non-CYP3A4-inhibiting antifungal. If unavoidable, obtain an ECG and monitor heart rate and QT, and review the siponimod dose per CYP2C9 genotype.
What other medicines interact with Itraconazole?
MediHelp also lists interactions of Itraconazole with, for example, Alfuzosin, Alprazolam, Avanafil. The full list is on the Itraconazole page.
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