Drug interactions
Donepezil + Toremifene
Severity: Major
Donepezil and Toremifene: major interaction.
Last updated Sources: UK SmPC
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 prolong the QT interval, and toremifene carries a boxed warning for dose-related QT prolongation. Combined use may increase the risk of torsades de pointes.
What this interaction means in plain words
Donepezil 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.
Donepezil belongs to Central Nervous System; Toremifene belongs to Endocrine.
Why it happens
Additive pharmacodynamic QT prolongation.
What to do
Avoid the combination where possible and consider an alternative to donepezil or toremifene. If used together, monitor ECG and keep potassium and magnesium normal.
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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References
- Apozyl 10 mg Orodispersible Tablets - SmPC sections 4.3/4.5 (class statement: other medicinal products known to prolong the QTc interval; "Caution is advised when donepezil is used in combination with other medicinal products known to prolong the QTc interval and clinical monitoring(ECG) may be req… — electronic medicines compendium (UK SmPC)
Other interactions of Donepezil
- Donepezil + Dronedarone Contraindicated
- Donepezil + Pimozide Contraindicated
- Donepezil + Thioridazine Contraindicated
- Donepezil + Vandetanib Contraindicated
- Amiodarone + Donepezil Major
- Amisulpride + Donepezil Major
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 Donepezil with Toremifene?
MediHelp rates the interaction as major. Donepezil 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. Both drugs can prolong the QT interval, and toremifene carries a boxed warning for dose-related QT prolongation. Combined use may increase the risk of torsades de pointes.
How serious is the interaction between Donepezil 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 to donepezil or toremifene. If used together, monitor ECG and keep potassium and magnesium normal.
What other medicines interact with Donepezil?
MediHelp also lists interactions of Donepezil with, for example, Dronedarone, Pimozide, Thioridazine. The full list is on the Donepezil page.
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