Drug interactions
Granisetron + Siponimod
Severity: Moderate
Granisetron 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 causes transient bradycardia and AV conduction slowing when started, and granisetron has a modest QT effect. Bradycardia raises the risk of torsades with QT-prolonging drugs.
What this interaction means in plain words
Granisetron 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.
Granisetron belongs to Gastrointestinal Tract; Siponimod belongs to Central Nervous System.
Why it happens
Bradycardia from S1P receptor modulation combined with QT prolongation from granisetron.
What to do
Obtain an ECG before starting siponimod and monitor heart rate during initiation. Seek cardiology advice if QT risk factors are present.
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 Granisetron
- Apomorphine + Granisetron Contraindicated
- Amiodarone + Granisetron Major
- Amisulpride + Granisetron Major
- Arsenic trioxide + Granisetron Major
- Artemether / lumefantrine + Granisetron Major
- Artemether + Granisetron 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 Granisetron with Siponimod?
MediHelp rates the interaction as moderate. Granisetron 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 causes transient bradycardia and AV conduction slowing when started, and granisetron has a modest QT effect. Bradycardia raises the risk of torsades with QT-prolonging drugs.
How serious is the interaction between Granisetron 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 monitor heart rate during initiation. Seek cardiology advice if QT risk factors are present.
What other medicines interact with Granisetron?
MediHelp also lists interactions of Granisetron with, for example, Apomorphine, Amiodarone, Amisulpride. The full list is on the Granisetron page.
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