Drug interactions
Siponimod + Verapamil
Severity: Major
Siponimod and Verapamil: major 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 at initiation, and verapamil adds sinus and AV nodal suppression, raising the risk of bradycardia and conduction block. Verapamil, a moderate CYP3A4 inhibitor, may also raise siponimod levels in patients with CYP2C9 variants.
What this interaction means in plain words
Siponimod and Verapamil can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Siponimod belongs to Central Nervous System; Verapamil belongs to Cardiovascular.
Why it happens
Additive heart-rate lowering effects, plus modest CYP3A4 inhibition of siponimod metabolism.
What to do
Avoid starting siponimod with verapamil unless cardiology input supports it. Switch to a non-rate-lowering drug or use ECG monitoring at initiation.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Verapamil
- Dofetilide + Verapamil Contraindicated
- Flibanserin + Verapamil Contraindicated
- Lomitapide + Verapamil Contraindicated
- Lonafarnib + Verapamil Contraindicated
- Pimozide + Verapamil Contraindicated
- Acebutolol + Verapamil 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 Siponimod with Verapamil?
MediHelp rates the interaction as major. Siponimod and Verapamil can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Siponimod can slow heart rate at initiation, and verapamil adds sinus and AV nodal suppression, raising the risk of bradycardia and conduction block. Verapamil, a moderate CYP3A4 inhibitor, may also raise siponimod levels in patients with CYP2C9 variants.
How serious is the interaction between Siponimod and Verapamil?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid starting siponimod with verapamil unless cardiology input supports it. Switch to a non-rate-lowering drug or use ECG monitoring at initiation.
What other medicines interact with Verapamil?
MediHelp also lists interactions of Verapamil with, for example, Dofetilide, Flibanserin, Lomitapide. The full list is on the Verapamil page.
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