Drug interactions
Donepezil + Lofexidine
Severity: Major
Donepezil and Lofexidine: 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
Lofexidine prolongs the QT interval and slows heart rate, and donepezil can produce bradycardia and QT prolongation. Combined use increases the risk of symptomatic bradycardia, syncope and ventricular arrhythmia.
What this interaction means in plain words
Donepezil and Lofexidine 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; Lofexidine belongs to Central Nervous System.
Why it happens
Additive QT prolongation and additive bradycardia from alpha-2 agonism and cholinesterase inhibition.
What to do
Avoid the combination if possible; if used, monitor ECG, heart rate and blood pressure and correct electrolytes. Reduce or stop one agent if the QTc lengthens markedly or bradycardia occurs.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Donepezil and Lofexidine, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
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 Lofexidine
- Adagrasib + Lofexidine Major
- Alfuzosin + Lofexidine Major
- Amiodarone + Lofexidine Major
- Amisulpride + Lofexidine Major
- Anagrelide + Lofexidine Major
- Apomorphine + Lofexidine Major
Frequently asked questions
Can I take Donepezil with Lofexidine?
MediHelp rates the interaction as major. Donepezil and Lofexidine 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. Lofexidine prolongs the QT interval and slows heart rate, and donepezil can produce bradycardia and QT prolongation. Combined use increases the risk of symptomatic bradycardia, syncope and ventricular arrhythmia.
How serious is the interaction between Donepezil and Lofexidine?
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 if possible; if used, monitor ECG, heart rate and blood pressure and correct electrolytes. Reduce or stop one agent if the QTc lengthens markedly or bradycardia occurs.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
