Drug interactions
Osimertinib + Siponimod
Severity: Major
Osimertinib and Siponimod: 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
Both drugs can affect cardiac conduction, since osimertinib prolongs the QT interval and siponimod slows heart rate. Together they may increase the risk of bradycardia-related arrhythmia such as torsades de pointes.
What this interaction means in plain words
Osimertinib and Siponimod 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.
Osimertinib belongs to Oncology; Siponimod belongs to Central Nervous System.
Why it happens
Additive QT prolongation combined with siponimod-induced bradycardia.
What to do
Obtain a baseline ECG and monitor it, and correct potassium and magnesium. Seek cardiology advice before starting siponimod.
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 Siponimod
- Cladribine + Siponimod Contraindicated
- Fingolimod + Siponimod Contraindicated
- Fluconazole + Siponimod Contraindicated
- Influenza virus vaccine quadrivalent intranasal + Siponimod Contraindicated
- Ponesimod + Siponimod Contraindicated
- Siponimod + Thioridazine Contraindicated
Other interactions of Osimertinib
Frequently asked questions
Can I take Osimertinib with Siponimod?
MediHelp rates the interaction as major. Osimertinib and Siponimod 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. Both drugs can affect cardiac conduction, since osimertinib prolongs the QT interval and siponimod slows heart rate. Together they may increase the risk of bradycardia-related arrhythmia such as torsades de pointes.
How serious is the interaction between Osimertinib and Siponimod?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Obtain a baseline ECG and monitor it, and correct potassium and magnesium. Seek cardiology advice before starting siponimod.
What other medicines interact with Siponimod?
MediHelp also lists interactions of Siponimod with, for example, Cladribine, Fingolimod, Fluconazole. The full list is on the Siponimod page.
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