Drug interactions
Donepezil + Trifluoperazine
Severity: Moderate
Donepezil and Trifluoperazine: 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
Donepezil can prolong the QT interval and has been linked to torsades de pointes and bradycardia. Trifluoperazine, a phenothiazine antipsychotic, also carries QT-prolonging potential. Used together, the risk of ventricular arrhythmia may be higher, especially in older patients or those with electrolyte disturbances.
What this interaction means in plain words
Donepezil and Trifluoperazine 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.
Why it happens
Additive pharmacodynamic QT prolongation, with donepezil adding vagotonic bradycardia.
What to do
Obtain a baseline ECG and correct potassium and magnesium before combining. Re-check the ECG after initiation or dose changes, and avoid the combination in patients with congenital long QT or bradycardia.
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 Donepezil
- Donepezil + Dronedarone Contraindicated
- Donepezil + Pimozide Contraindicated
- Donepezil + Thioridazine Contraindicated
- Donepezil + Vandetanib Contraindicated
- Amiodarone + Donepezil Major
- Amisulpride + Donepezil Major
Frequently asked questions
Can I take Donepezil with Trifluoperazine?
MediHelp rates the interaction as moderate. Donepezil and Trifluoperazine 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. Donepezil can prolong the QT interval and has been linked to torsades de pointes and bradycardia. Trifluoperazine, a phenothiazine antipsychotic, also carries QT-prolonging potential. Used together, the risk of ventricular arrhythmia may be higher, especially in older patients or those with electrolyte disturbances.
How serious is the interaction between Donepezil and Trifluoperazine?
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 and correct potassium and magnesium before combining. Re-check the ECG after initiation or dose changes, and avoid the combination in patients with congenital long QT or bradycardia.
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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