Drug interactions
Siponimod + Valbenazine
Severity: Moderate
Siponimod and Valbenazine: 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
Valbenazine can prolong the QT interval at higher exposures, and siponimod causes bradycardia and conduction slowing at initiation. Together they may increase proarrhythmic risk.
What this interaction means in plain words
Siponimod and Valbenazine 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.
Siponimod belongs to Central Nervous System; Valbenazine belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic effects on cardiac repolarization and conduction.
What to do
Obtain a baseline ECG and correct electrolyte abnormalities before starting siponimod. Monitor heart rate and ECG during initiation, and seek cardiology advice if QT risk factors are present.
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 Valbenazine
- Deutetrabenazine + Valbenazine Contraindicated
- Tranylcypromine + Valbenazine Contraindicated
- Amiodarone + Valbenazine Major
- Amisulpride + Valbenazine Major
- Apalutamide + Valbenazine Major
- Carbamazepine + Valbenazine Major
Frequently asked questions
Can I take Siponimod with Valbenazine?
MediHelp rates the interaction as moderate. Siponimod and Valbenazine 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. Valbenazine can prolong the QT interval at higher exposures, and siponimod causes bradycardia and conduction slowing at initiation. Together they may increase proarrhythmic risk.
How serious is the interaction between Siponimod and Valbenazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Obtain a baseline ECG and correct electrolyte abnormalities before starting siponimod. Monitor heart rate and ECG during initiation, and seek cardiology advice if QT risk factors are present.
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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