Category- Allopathy
Medicine Highlights
| Uses | 1. To treat dementia in Alzheimer’s disease 2. To treat symptoms of other types of dementia (Lewy body and Vascular dementia). |
| Common Side Effects | 1. Diarrhea 2. Loss of appetite 3. Muscle cramps 4. Nausea 5. Trouble in sleeping 6. Unusual tiredness or weakness 7. Vomiting |
| Additional Information | 1. Avoid driving or any hazardous activity after consuming donepezil, as it can cause dizziness or drowsiness. 2. It is occasionally prescribed for dementia related to Parkinson’s disease, lewy body dementia and vascular dementia |
| Storage | 1. The medicine should be stored at room temperature. 2. Keep away from sunlight and moisture. 3. Keep away from the reach of children |
| How to Take This Medicine | To be taken orally with a sip of water |
Donepezil Uses
Donepezil 5 mg is an oral medicine belonging to the category of cholinesterase inhibitors and is used for the management of Alzheimer’s-related dementia and other types of dementia including lewy body dementia and vascular dementia and their symptoms.
Donepezil side effects
More Common
- Diarrhea
- Loss of appetite
- Muscle cramps
- Nausea
- Trouble in sleeping
- Unusual tiredness or weakness
- Vomiting
Less Common
- Anxiety
- Black, tarry stools
- Chest pain or tightness
- Chills
- Cough or hoarseness
- Decrease in the frequency of urination
- Abnormal dreams
- Constipation
- Dizziness
- Drowsiness
- Fainting
- Frequent urination
- Headache
- Joint pain, stiffness, or swelling
- Mental depression
- Pain
- Unusual bleeding or bruising
- Weight loss
How Donepezil works
Donepezil helps the brain in dementia by keeping more of a chemical messenger called acetylcholine around. This messenger is important for memory and thinking, but in Alzheimer’s disease it gets cleared away too quickly. Donepezil slows down the “clean‑up crew” that normally removes it, so the brain cells can talk to each other more easily.
Safety Measures and Warning
Pregnancy
The safety of donepezil in pregnancy is not established. Inform your doctor if you are pregnant or planning to conceive.
Kidney and Liver Problems
Donepezil is known to be safe for use in liver and kidney disease patients.
Past Mental Health Issues
Donepezil directly acts on the brain and causes different side effects like sedation, drowsiness, and suicidal thoughts. Inform the doctor about your past mental health issues before using donepezil.
Breastfeeding
Breastfeeding while on donepezil is usually avoided because its presence in breast milk and potential effects on the baby are unknown.
Heart Problems
Donepezil can affect the heart by slowing the heart rate and, in rare cases, causing rhythm problems, so it must be used with caution in patients with existing heart disease.
Donepezil Interaction with Food Product
Avoid consuming alcohol and smoking simultaneously together, as it may affect the drug’s action and show an effect on the brain, leading to severe drowsiness, sedation, and coma in severe cases.
Donepezil Interaction with Other Medicines
Avoid taking Donepezil 5 mg with the following medicines, as it may increase or decrease the desired effect, or in worse cases, it could be fatal:
Donepezil Chemical Structure
IUPAC (International Union of Pure and Applied Chemistry)/ Chemical name
(RS)-2-[(1-benzyl-4-piperidyl)methyl]-5,6-dimethoxy-2,3-dihydroinden-1-one
Intake routine/cycle
Daily dose
Take Donepezil exactly as your doctor recommends. The dose may change based on your condition and how well you respond. Do not take more than prescribed without consulting your doctor.
Missed Dose
If you forget to take your medicine, take the medication as soon as you remember. If it’s nearly time for your next dose, skip the missed one and continue with your regular schedule. Always consult the doctor before making any changes to your dosage.
Overdose
It is not recommended to take more than 23 mg of Donepezil per day, as it may cause severe overdosing effects like extreme drowsiness, confusion, unconsciousness, sweating, double vision, low blood pressure, and slurred speech. Immediately seek medical attention and meet the doctor if necessary.
Storage
- Store the medicine at room temperature
- Keep away from sunlight and moisture
- Keep out of reach of children
Directions for use
- Take Donepezil exactly as prescribed by your doctor, at the same time each day.
- Do not stop taking Donepezil without your doctor’s approval, even if you feel better.
- If you forget to take Donepezil, take it as soon as you remember. If it’s almost time for your next dose, skip the missed dose.
Donepezil Summary
Donepezil is an oral medicine from the acetylcholinesterase inhibitor class of medication used mainly for Alzheimer’s dementia and sometimes for Lewy body dementia, vascular dementia and Parkinson related memory problems. It works by stopping the breakdown of acetylcholine, a brain messenger needed for memory and thinking, so nerve cells can talk to each other more clearly. Common side effects include nausea, diarrhea, poor sleep, muscle cramps, tiredness, and loss of appetite. Food does not change how well it is absorbed, but alcohol and medicines that slow the heart or increase stomach acid can raise risks. In simple terms it slows the cleanup of brain messages, so they last longer, which can ease memory and daily function, though it does not cure the disease.
FAQ’s
What is Donepezil’s highest dose?
The highest approved daily dose of donepezil is 23 mg once daily, used only in moderate to severe Alzheimer’s disease after at least 3 months on 10 mg daily. For mild to moderate Alzheimer’s, the maximum recommended dose is 10 mg once daily.
What are the uses of Donepezil tablets?
Donepezil tablets are used to treat dementia symptoms in mild, moderate, and severe Alzheimer’s disease by improving memory, attention, and daily functioning.
What are the side effects of Donepezil tablets?
Donepezil tablets commonly cause nausea, diarrhea, loss of appetite, muscle cramps, tiredness, and trouble sleeping.
What is the Donepezil drug class?
Donepezil belongs to the drug class called cholinesterase inhibitors, specifically an acetylcholinesterase inhibitor. It works by preventing the breakdown of acetylcholine, a brain chemical important for memory and thinking, thereby improving communication between nerve cells in dementia.
Reference
- StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan–. Donepezil. [Updated 2025 Jan 2]. Available from.
- Mayo Clinic. Donepezil (oral route) [Internet]. Rochester (MN): Mayo Foundation for Medical Education and Research; c1998–2025 [updated 2025 Sep 30; cited 2025 Oct 18]. Available from.
- Drugs.com. Donepezil: uses, dosage, side effects, warnings [Internet]. Drugs.com; c2000–2024 [updated 2024 Jul 4; cited 2025 Oct 18]. Available from.
- National Center for Biotechnology Information. PubChem Compound Summary for CID 3152, Donepezil [Internet]. Bethesda (MD): National Library of Medicine (US); c2004–2025 [cited 2025 Oct 18]. Available from.
Authors
Siva Krishna Adithya Bhumireddy completed a Bachelor of Pharmacy from GIET School of Pharmacy, affiliated with Andhra University, and from his 3rd year of graduation, he was working as a freelance medical and publication writer. Having expertise in systematic reviews and clinical research. With his keen interest and skills in research and documentation practices, he also reviewed more than 150 manuscripts from international journals like Elsevier, Springer Nature, and Sage Journals, and all the manuscripts were indexed and appeared in PubMed, Scopus, and Web of Science databases, and he received honorary recognition letters and certificates from all of them. Siva Krishna Adithya also published a few systematic, narrative reviews and a few chapters of international expertise.