Cardiac conduction disorders have been reported in patients receiving donepezil. The Product Information (PI) documents for this medicine are being updated to advise caution in patients with known QTc prolongation or a family history of this condition. Additionally, caution is advised in patients also receiving other drugs that affect the QTc interval, or who have certain types of cardiac disease (see below) or electrolyte disturbances. As these adverse effects can be severe and potentially life threatening, clinical monitoring may be required.
Donepezil hydrochloride is a cholinesterase inhibitor that enhances cholinergic function in the central nervous system. It is indicated for the treatment of mild, moderate and severe Alzheimer's disease.
It is marketed in Australia as Aricept and various generic brands.
The following warning has been added to 'Cardiovascular conditions' in the 'Special warnings and precautions for use' section (4.4) of the Aricept PI for donepezil:
'Cases of QTc interval prolongation and Torsades de Pointes have been reported for donepezil (see sections 4.4 and 4.8). Caution is advised when donepezil is used in combination with other medicinal products known to prolong the QTc interval and clinical monitoring may be required. Examples include:
Class IA antiarrhythmics (e.g. disopyramide)
Class III antiarrhythmics (e.g. amiodarone, sotalol)
Certain antidepressants (e.g. citalopram, escitalopram, amitriptyline)
Other antipsychotics (e.g. phenothiazine derivatives, pimozide, ziprasidone)
Certain antibiotics (e.g. clarithromycin, erythromycin, moxifloxacin)'
In the 'Adverse effects' section (4.8) of the Aricept PI for donepezil, 'electrocardiogram QT interval prolonged' and 'polymorphic ventricular tachycardia including Torsades de Pointes' have been added to the post-marketing experience list.
Post-marketing adverse event data
The PI updates are based on evidence published in the literature and from post-market adverse event data in Australia and internationally.
To 5 January 2022, there have been 18 cases of atrioventricular block, atrioventricular block complete, atrioventricular block second degree, bundle branch block, bifascicular block or Torsades de Pointes associated with donepezil reported to the TGA and included in our Database of Adverse Event Notifications (DAEN).
Information for health professionals
Health professionals should be aware of any pre-existing or family history of cardiac disease, significant electrolyte changes and relevant drug interactions when prescribing donepezil for a patient.
The cardiac conduction disorders caused by donepezil can be potentially life threatening, so monitoring of cardiac function may be required in at-risk individuals or where this adverse event is suspected.
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Medicines Safety Update - Information for health professionals
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