Drug interactions
Siponimod + Venlafaxine
Severity: Moderate
Siponimod and Venlafaxine: 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 initiation causes transient slowing of heart rate and can affect atrioventricular conduction, and venlafaxine has a small QT effect. The combined impact on cardiac rhythm is mainly theoretical but may matter in patients with underlying cardiac disease.
What this interaction means in plain words
Siponimod and Venlafaxine 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; Venlafaxine belongs to Central Nervous System.
Why it happens
Additive cardiac effects: siponimod-induced bradycardia combined with venlafaxine's QT-prolonging potential.
What to do
Obtain a baseline ECG before starting siponimod and consider first-dose monitoring in patients with cardiac risk factors. Seek cardiology advice if the QTc is prolonged.
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 Venlafaxine
- Isocarboxazid + Venlafaxine Contraindicated
- Methylene blue + Venlafaxine Contraindicated
- Phenelzine + Venlafaxine Contraindicated
- Procarbazine + Venlafaxine Contraindicated
- Rasagiline + Venlafaxine Contraindicated
- Safinamide + Venlafaxine 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 Siponimod with Venlafaxine?
MediHelp rates the interaction as moderate. Siponimod and Venlafaxine 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 initiation causes transient slowing of heart rate and can affect atrioventricular conduction, and venlafaxine has a small QT effect. The combined impact on cardiac rhythm is mainly theoretical but may matter in patients with underlying cardiac disease.
How serious is the interaction between Siponimod and Venlafaxine?
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 before starting siponimod and consider first-dose monitoring in patients with cardiac risk factors. Seek cardiology advice if the QTc is prolonged.
What other medicines interact with Venlafaxine?
MediHelp also lists interactions of Venlafaxine with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Venlafaxine page.
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