Reviewed by the Help Dementia Editorial Team — our editors review every article for accuracy against guidance from the National Institute on Aging, the Alzheimer’s Association, and peer-reviewed sources.
This guide is part of our pillar: Dementia Medications Compared Donepezil Rivastigmine Memantine.
Related guide: Dementia Medications Compared — our comprehensive resource on this topic.
Donepezil dosage choices look simple on paper but have real trade-offs. The right dose balances cognitive benefit with side effect burden for each patient.
Understanding donepezil dosage helps families ask better questions and make calmer decisions. The detail below covers what doctors usually skip when explaining donepezil dosage.
Starting Dose: 5mg
Standard starting dose for 4 to 6 weeks to establish tolerability before escalation.
Standard Maintenance: 10mg
Most patients eventually take 10mg. The bump from 5 to 10mg gives modest additional benefit but doubles side effects.
The 23mg Option
FDA-approved for moderate to severe Alzheimer’s. Slightly better cognition than 10mg in trials but markedly more GI side effects and weight loss.
When to Stay at 5mg
Frail patients, those with bradycardia, or those who never tolerate 10mg should remain at 5mg with no shame.
When to Stop Entirely
No measurable benefit at 6 months, severe weight loss, recurrent falls, or significant decline despite the medication.
Frequently Asked Questions
How long does donepezil take to work?
Cognitive benefit, when it occurs, is usually visible by 8 to 12 weeks.
Is 23mg worth the side effects?
For most patients, no. The trade-off rarely favors the higher dose.
For more, see MedlinePlus dementia.
