Donepezil (Aricept): Uses, Warnings, and Key Facts
Quick summary Donepezil is an active ingredient used in the treatment of Alzheimer’s disease. It is a reversible acetylcholinesterase inhibitor and is marketed in the United States under brand names such as Aricept and...
This content is for educational purposes only and does not replace medical advice, diagnosis or treatment from a qualified healthcare professional.
Quick summary
Donepezil is an active ingredient used in the treatment of Alzheimer’s disease. It is a reversible acetylcholinesterase inhibitor and is marketed in the United States under brand names such as Aricept and Aricept ODT.
Medical disclaimer: This article is for general information only and does not replace the official patient leaflet, prescribing information, or advice from a qualified healthcare professional. Do not use it to diagnose a condition or make treatment changes.
What is donepezil?
Donepezil is an active ingredient used in the treatment of Alzheimer’s disease. The ingredient is donepezil hydrochloride (HCl).
In the United States, brand names include Aricept and Aricept ODT.
How donepezil works
Donepezil is a specific and reversible inhibitor of acetylcholinesterase, the main cholinesterase in the brain.
In practical terms, this means it acts on a brain enzyme involved in breaking down acetylcholine.
What donepezil is used for
Donepezil is indicated for the symptomatic treatment of mild to moderately severe Alzheimer’s disease.
It is important to check the official prescribing information for the exact approved use and formulation details.
How it is taken
Donepezil is taken orally.
The original content states it is taken before going to bed. It also notes an adult and elderly starting dose of 5 mg/day for 1 month, followed by evaluation and possible increase to 10 mg/day.
Children are not recommended in the original content.
Because dosing can vary by product and patient situation, the official leaflet and a healthcare professional should always be consulted.
Contraindications listed in the original content
- Hypersensitivity.
- Piperidine derivatives.
- Pregnancy.
Warnings and precautions
The original content highlights the following precautions:
- Anesthesia.
- May accentuate muscle relaxation of the succinylcholine type.
- Supraventricular cardiac conduction alterations.
- History of asthma.
- Obstructive pulmonary disease, ulcerative disease, or use with NSAIDs.
- May exacerbate or induce extrapyramidal symptoms.
- Risk of convulsions and lower urinary tract obstruction.
- Risk of neuroleptic malignant syndrome; discontinue treatment if symptoms suggest this condition.
- Risk of rhabdomyolysis, especially at the beginning of treatment or when increasing the dose.
If any of these apply, the prescribing clinician should review the official product information before use.
Drug interactions
The original content lists the following interaction points:
- Metabolism may be inhibited by CYP3A4 and 2D6 inhibitors.
- Levels may be reduced by rifampicin, phenytoin, carbamazepine, and alcohol.
- Synergistic activity with succinylcholine, other neuromuscular blockers, cholinergic agonists, and beta-blockers.
Because interaction risk depends on the full medicine list, a pharmacist or prescriber should review all prescription, over-the-counter, and herbal products.
Pregnancy and breastfeeding
Pregnancy
The original content lists pregnancy as contraindicated.
Breastfeeding
The original content advises to avoid breastfeeding. It notes that donepezil is excreted in milk in rats, but it is not known whether it is excreted in human breast milk.
Effects on driving and using machines
Alzheimer’s disease itself can reduce driving ability or the ability to use machines. The original content also notes that donepezil may cause dizziness and drowsiness, especially when treatment is started or when the dose is increased.
Its influence on driving and machine use is described as mild or moderate, and the physician should regularly evaluate whether the person can continue driving or operating complex machinery.
Possible adverse reactions
The original content lists the following adverse reactions and side effects:
- Diarrhea, nausea, vomiting.
- Muscle cramps, fatigue, pain.
- Insomnia, syncope, dizziness.
- Abdominal discomfort, urinary incontinence, rash, itching.
- Headache, anorexia, common cold.
- Hallucinations, agitation, aggressive behavior, abnormal dreams, and nightmares.
- Accidents.
Any new or severe symptom should be discussed with a healthcare professional.
Overdose information
The original content states that a tertiary anticholinergic antidote such as atropine may be used.
It also notes that an intravenous injection of atropine sulfate is recommended with an initial dose of 1–2 mg, with later doses based on clinical response.
This information is included for reference only and should not be used to manage an emergency without urgent medical help.
Reference table
| Topic | Information from the original content |
|---|---|
| Active ingredient | Donepezil hydrochloride (HCl) |
| Main use | Symptomatic treatment of mild to moderately severe Alzheimer’s disease |
| Brand names in the U.S. | Aricept, Aricept ODT |
| Route | Oral |
| Key caution | Review interactions, anesthesia concerns, and listed precautions with a clinician |
Frequently asked questions
▸ What is donepezil used for?
The original content states that donepezil is used for the symptomatic treatment of mild to moderately severe Alzheimer’s disease.
▸ Is donepezil the same as Aricept?
Aricept is one of the brand names listed for donepezil in the United States.
▸ What are the most common side effects listed here?
The original content lists diarrhea, nausea, vomiting, muscle cramps, fatigue, pain, insomnia, dizziness, and syncope among the adverse reactions.
▸ Can donepezil be used in pregnancy?
The original content lists pregnancy as contraindicated.
▸ Where can I check the official information?
The FDA medication guide and the official prescribing information are the best sources for product-specific details.
Safety reminder
Before using any medicine information online, verify the exact product, formulation, and instructions in the official leaflet or with a pharmacist or prescriber. Seek urgent medical help for suspected overdose, severe allergic reaction, fainting, breathing problems, chest symptoms, or sudden severe changes in behavior.
Sources and further reading
- FDA Medication Guides
- UNII: 8SSC91326P
- ChemIDplus
- DrugPortal
- PubChem CID: 3152
- NCI Thesaurus: C66874
Video reference: Donepezil/Aricept video
Medical disclaimer
This content is for educational purposes only. It should not be used as a substitute for professional medical advice, diagnosis or treatment. Always ask a doctor, pharmacist or qualified healthcare professional before starting, stopping or changing any medicine.
Sources and verification
The following sources or official references are listed to support verification of the medicine information discussed in this article.
Medicine information can change and may vary depending on country, product formulation, patient history and professional guidance. Always check official medicine information and ask a healthcare professional for personal medical questions.