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Donepezil is a prescription medicine that can help with some symptoms of Alzheimer’s disease and related dementias. It does not cure dementia.
What should I know about Donepezil?
It usually takes at least a month to start working, and longer for some people.
What are the side effects?
Diarrhoea, headaches and feeling sick are common.
Who should check first?
Tell the doctor about other medical conditions and all medicines. Alcohol makes donepezil less effective and raises the risk of side effects.
When should I get help?
Speak to the doctor or pharmacist if side effects are troubling or the person seems unwell.
Doses vary, so follow your prescriber, pharmacist and the medicine label. In Australia, call 000 in an emergency. Outside Australia, use your local emergency number.
Source: NHS: About donepezil. General education does not replace individual medical advice. Updated November 2026.
Explore our health guides and medicine FAQs. Medicine availability and product instructions vary by country; follow the leaflet supplied with your medicine.