Drug interactions
Olanzapine + Toremifene
Severity: Major
Olanzapine and Toremifene: 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
Toremifene prolongs the QT interval in a dose-related manner and carries a label warning about use with other QT-prolonging drugs. Olanzapine may add to the effect and raise the risk of torsade de pointes.
What this interaction means in plain words
Olanzapine and Toremifene 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.
Olanzapine belongs to Central Nervous System; Toremifene belongs to Endocrine.
Why it happens
Additive prolongation of the QT interval.
What to do
Avoid the combination where possible and consider an alternative antipsychotic or endocrine agent. If it is unavoidable, monitor the ECG and electrolytes regularly.
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 Olanzapine
Other interactions of Toremifene
- Amiodarone + Toremifene Contraindicated
- Dronedarone + Toremifene Contraindicated
- Nilotinib + Toremifene Contraindicated
- Pimozide + Toremifene Contraindicated
- Quinidine + Toremifene Contraindicated
- Ribociclib + Toremifene Contraindicated
Frequently asked questions
Can I take Olanzapine with Toremifene?
MediHelp rates the interaction as major. Olanzapine and Toremifene 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. Toremifene prolongs the QT interval in a dose-related manner and carries a label warning about use with other QT-prolonging drugs. Olanzapine may add to the effect and raise the risk of torsade de pointes.
How serious is the interaction between Olanzapine and Toremifene?
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 the combination where possible and consider an alternative antipsychotic or endocrine agent. If it is unavoidable, monitor the ECG and electrolytes regularly.
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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