Drug interactions
Lithium + Siponimod
Severity: Moderate
Lithium 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
Siponimod causes transient heart rate slowing and conduction delay at initiation, and lithium can cause sinus node dysfunction and QT changes. The combination may increase the risk of bradyarrhythmia.
What this interaction means in plain words
Lithium 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.
Lithium belongs to Central Nervous System; Siponimod belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic effects on heart rate, conduction and repolarization.
What to do
Obtain an ECG before starting siponimod and follow the labeled titration with heart rate monitoring. Seek cardiology advice if there is baseline bradycardia or conduction disease.
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 Lithium
- Lithium + Thioridazine Contraindicated
- Lithium + Vandetanib Contraindicated
- Aceclofenac + Lithium Major
- Acemetacin + Lithium Major
- Amisulpride + Lithium Major
- Amlodipine-benazepril + Lithium Major
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 Lithium with Siponimod?
MediHelp rates the interaction as moderate. Lithium 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. Siponimod causes transient heart rate slowing and conduction delay at initiation, and lithium can cause sinus node dysfunction and QT changes. The combination may increase the risk of bradyarrhythmia.
How serious is the interaction between Lithium 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: Obtain an ECG before starting siponimod and follow the labeled titration with heart rate monitoring. Seek cardiology advice if there is baseline bradycardia or conduction disease.
What other medicines interact with Lithium?
MediHelp also lists interactions of Lithium with, for example, Thioridazine, Vandetanib, Aceclofenac. The full list is on the Lithium page.
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