Drug interactions
Citalopram + Siponimod
Severity: Moderate
Citalopram 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 can cause transient bradycardia and conduction delay on initiation, and citalopram prolongs the QT interval. Bradycardia raises the risk of torsades de pointes in patients taking QT-prolonging drugs.
What this interaction means in plain words
Citalopram 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.
Citalopram belongs to Central Nervous System; Siponimod belongs to Central Nervous System.
Why it happens
S1P receptor-mediated bradycardia combined with citalopram's QT prolongation.
What to do
Obtain an ECG before starting siponimod and seek cardiology advice when a QT-prolonging drug is essential. Monitor heart rate during initiation.
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 Citalopram
- Cisapride + Citalopram Contraindicated
- Citalopram + Dronedarone Contraindicated
- Citalopram + Escitalopram Contraindicated
- Citalopram + Isocarboxazid Contraindicated
- Citalopram + Methylene blue Contraindicated
- Citalopram + Phenelzine 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 Citalopram with Siponimod?
MediHelp rates the interaction as moderate. Citalopram 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 can cause transient bradycardia and conduction delay on initiation, and citalopram prolongs the QT interval. Bradycardia raises the risk of torsades de pointes in patients taking QT-prolonging drugs.
How serious is the interaction between Citalopram 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 seek cardiology advice when a QT-prolonging drug is essential. Monitor heart rate during initiation.
What other medicines interact with Citalopram?
MediHelp also lists interactions of Citalopram with, for example, Cisapride, Dronedarone, Escitalopram. The full list is on the Citalopram page.
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