Drug interactions
Mirtazapine + Siponimod
Severity: Moderate
Mirtazapine 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 slow heart rate and prolong atrioventricular conduction on initiation, and bradycardia increases susceptibility to QT-related arrhythmia. Mirtazapine has a weak QT effect, so the interaction is of limited concern in most patients.
What this interaction means in plain words
Mirtazapine 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.
Mirtazapine belongs to Central Nervous System; Siponimod belongs to Central Nervous System.
Why it happens
Possible additive effects on cardiac repolarization and conduction, with siponimod-related bradycardia increasing the risk.
What to do
Review the ECG before starting siponimod in patients taking QT-prolonging drugs, and consider cardiology advice if the QTc is prolonged. Follow the labeled first-dose monitoring.
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 Mirtazapine
- Isocarboxazid + Mirtazapine Contraindicated
- Mirtazapine + Phenelzine Contraindicated
- Mirtazapine + Pimozide Contraindicated
- Mirtazapine + Procarbazine Contraindicated
- Mirtazapine + Rasagiline Contraindicated
- Mirtazapine + Selegiline 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 Mirtazapine with Siponimod?
MediHelp rates the interaction as moderate. Mirtazapine 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 slow heart rate and prolong atrioventricular conduction on initiation, and bradycardia increases susceptibility to QT-related arrhythmia. Mirtazapine has a weak QT effect, so the interaction is of limited concern in most patients.
How serious is the interaction between Mirtazapine 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: Review the ECG before starting siponimod in patients taking QT-prolonging drugs, and consider cardiology advice if the QTc is prolonged. Follow the labeled first-dose monitoring.
What other medicines interact with Mirtazapine?
MediHelp also lists interactions of Mirtazapine with, for example, Isocarboxazid, Phenelzine, Pimozide. The full list is on the Mirtazapine page.
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