Drug interactions
Olanzapine + Siponimod
Severity: Moderate
Olanzapine 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
Olanzapine is not a clinically meaningful CYP2C9 inhibitor, so a pharmacokinetic rise in siponimod exposure is unlikely. Both drugs have been associated with QT or conduction effects, and siponimod also slows heart rate, so additive arrhythmic risk is possible but modest with olanzapine.
What this interaction means in plain words
Olanzapine 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.
Olanzapine belongs to Central Nervous System; Siponimod belongs to Central Nervous System.
Why it happens
Possible additive QT prolongation and bradycardia; no established CYP2C9 inhibition by olanzapine.
What to do
Obtain a baseline ECG before starting siponimod and monitor heart rate and QTc, correcting potassium and magnesium abnormalities. Reassess if other QT-prolonging drugs are added.
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 Olanzapine
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 Olanzapine with Siponimod?
MediHelp rates the interaction as moderate. Olanzapine 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. Olanzapine is not a clinically meaningful CYP2C9 inhibitor, so a pharmacokinetic rise in siponimod exposure is unlikely. Both drugs have been associated with QT or conduction effects, and siponimod also slows heart rate, so additive arrhythmic risk is possible but modest with olanzapine.
How serious is the interaction between Olanzapine 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 a baseline ECG before starting siponimod and monitor heart rate and QTc, correcting potassium and magnesium abnormalities. Reassess if other QT-prolonging drugs are added.
What other medicines interact with Olanzapine?
MediHelp also lists interactions of Olanzapine with, for example, Amisulpride, Amoxapine, Apomorphine. The full list is on the Olanzapine page.
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