Drug interactions
Siponimod + Solifenacin
Severity: Moderate
Siponimod and Solifenacin: 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
Siponimod slows heart rate and atrioventricular conduction on initiation, and solifenacin has a small QT effect. Combined use may increase the risk of arrhythmia in patients with underlying cardiac disease.
What this interaction means in plain words
Siponimod and Solifenacin 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; Solifenacin belongs to Genitourinary.
Why it happens
Additive cardiac effects from siponimod-related bradycardia and QT prolongation.
What to do
Perform a baseline ECG and heart rate assessment before starting siponimod and monitor during initiation. Seek cardiology advice in patients with QT risk factors.
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 Solifenacin
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 Siponimod with Solifenacin?
MediHelp rates the interaction as moderate. Siponimod and Solifenacin 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 slows heart rate and atrioventricular conduction on initiation, and solifenacin has a small QT effect. Combined use may increase the risk of arrhythmia in patients with underlying cardiac disease.
How serious is the interaction between Siponimod and Solifenacin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Perform a baseline ECG and heart rate assessment before starting siponimod and monitor during initiation. Seek cardiology advice in patients with QT risk factors.
What other medicines interact with Solifenacin?
MediHelp also lists interactions of Solifenacin with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Solifenacin page.
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