What is Donepezil?

Donepezil is a drug that is used to treat Alzheimer's disease. It is marketed under the brand names Aricept and others. It tends to enhance mental function and the ability to function in a minor way. However, there hasn't been any evidence that using it slows down the development of the disease. If there is no benefit, care should be stopped.

Donepezil Uses

Donepezil is a drug that is used to treat Alzheimer's disease-related confusion (dementia). It is not a cure for Alzheimer's disease, but it can help with memory, perception, and work. This medicine is an enzyme inhibitor that acts by restoring the balance of natural substances in the brain (neurotransmitters).

How to use donepezil oral?

  • Before you start taking donepezil, and each time you get a refill, read the Patient Information Leaflet if one is available from your pharmacist. Inquire with your doctor or pharmacist if you have any doubts.
  • Take this drug by mouth once a day, just before bedtime, as instructed by your doctor, with or without food. Speak to your doctor about switching to a morning dose if you're having trouble sleeping (insomnia).
  • Take the 23-milligram strength tablets whole if you're taking them. These tablets should not be cut, crushed, or chewed. It is likely that this will raise the risk of side effects.
  • Dosage is based only on your medical condition and treatment reaction. Your doctor will start you on a low dose of this drug and gradually increase it over weeks to months to reduce the risk of side effects (such as nausea and diarrhea). Carefully follow the doctor's orders. Do not raise your dosage or take this medicine more often than recommended.
  • If you miss 7 or more days in a row without taking donepezil, consult your doctor before beginning again. To - the risk of side effects, you may need to start with a lower dose.
  • To get the most satisfaction from this drug, take it on a daily basis. Take it at the same time every day to help you remember. You do not quit taking it until your doctor orders you to. It could take a few weeks before you see the full effect of this medication.

Donepezil Side Effects

  • Nausea
  • Diarrhea
  • Not sleeping well
  • Vomiting
  • Muscle cramps
  • Tiredness
  • Eat less
  • Having a poor appetite
  • Bruising
  • Weight loss
  • Slow heart rate
  • Stomach ulcers
  • Bleeding
  • Heartburn
  • Stomach pain that won’t go away
  • Blood in your vomit
  • Dark-colored vomit like coffee grounds
  • Bowel movements that look like black tar
  • Worsening of lung problems
  • Other lung diseases
  • Seizures
  • Trouble urinating


  • If you are allergic to donepezil or have some other allergies, notify your doctor or pharmacist before taking it. Inactive ingredients can be found in this product, triggering allergic reactions or other issues. For more information, talk with your pharmacist.
  • Tell your doctor or pharmacist if you have ever experienced any of the following medical conditions: respiratory difficulties (asthma, chronic obstructive pulmonary disease), fainting, seizures, stomach/intestinal disease (ulcers, bleeding), or difficulty urinating (such as enlarged prostate).
  • This medication can cause dizziness or drowsiness. You can feel dizzy or sleepy if you ingest alcohol or marijuana (cannabis). Do not drive a vehicle or run machinery. This medication can cause dizziness or drowsiness. You can feel dizzy or sleepy if you consume alcohol or marijuana (cannabis). Do not drive, operate machinery, or engage in any other operation that involves alertness until you are confident you can do so safely. Limit your consumption of alcoholic drinks. If you use marijuana, talk to your doctor (cannabis). Donepezil has been related to a heart rhythm disorder (QT prolongation). QT prolongation can cause serious (rarely fatal) fast/irregular heartbeat and other symptoms (including extreme dizziness and fainting) that require urgent medical attention.
  • If you have any medical conditions or are taking other medications that may induce QT prolongation, the risk of QT prolongation may be increased. Tell your doctor or pharmacist about any of your medications and whether you have any of the following conditions before taking donepezil: certain heart attacks (heart failure, sluggish pulse, EKG QT prolongation), family history of certain heart problems (QT prolongation in the EKG, sudden cardiac death).
  • Tell your doctor or dentist of all the things you use before surgery (including prescription drugs, nonprescription drugs, and herbal products).
  • The drug's side effects, especially QT prolongation, maybe more serious in older adults.
  • This drug should only be taken during pregnancy if absolutely necessary. Consult your doctor about the risks and benefits.
  • It is unclear whether or not this medicine moves into breast milk. Before you do breastfeeding, once talk to your doctor.
  • QT prolongation can also be caused by low potassium or magnesium levels in the blood. If you use certain medications, such as diuretics/water tablets, or if you have conditions like excessive sweating, diarrhea, or vomiting, the risk can increase.


  • Drug interactions can cause your drugs to function differently or put you at risk for severe side effects. This list does not cover all potential drug interactions. Keep a list of all you use (including prescription and nonprescription medications, as well as herbal products) and share it with your doctor and pharmacist. Without your doctor's permission, do not begin, stop, or change the dosage of any medications.
  • Aspirin and non-steroidal anti-inflammatory drugs are two things that may interfere with this medicine (NSAIDs, such as ibuprofen, naproxen).
  • Since several drugs include pain relievers/fever reducers (NSAIDs such as aspirin), read both prescription and nonprescription drug labels carefully.
  • Many drugs contain pain relievers/fever reducers (NSAIDs such as aspirin, ibuprofen, or naproxen) that, when coupled with donepezil, can increase the risk of stomach/intestinal bleeding. Check all prescription and nonprescription drug labels carefully. Low-dose aspirin should be continued as recommended by your doctor for particular medical purposes such as heart attack or stroke prevention (typically at dosages of 81-325 milligrams per day). For more details, speak to your doctor or pharmacist.

Do not offer this drug to someone else.

To monitor for side effects, your doctor can check your weight on a regular basis.

Missed Dose

If you skip a dose, take it as soon as you know. Daily, take the next dose at the same time. Do not get all the dose to catch up.


Store away from direct light and moisture at room temperature. Keep out of the shower. Both drugs should be kept out of sight of kids and pets. Unless otherwise directed, do not flush or spill drugs down the toilet or into a drain. When this commodity has expired or is no longer required, properly dispose of it. For more information about how to properly dispose of your prescription, contact your pharmacist or a local waste disposal company.

Donepezil vs Memantine



Donepezil is sold as the trade name Aricept Memantine oral tablet comes in both brand-name and generic form.
Donepezil is used to treat Alzheimer's disease. Memantine is an Alzheimer's disease drug used to treat moderate-to-severe symptoms.
Molecular Formula: C24H29NO3 Molecular Formula: C12H21N
Molar mass: 379.492 g/mol Molar mass: 179.3 g/mol

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Frequently Asked Questions

What is Donepezil taken for?

Donepezil is a drug that is used to treat dementia (a brain condition that affects the ability to recall, think clearly, talk, and conduct everyday tasks, as well as mood and personality changes) in people with Alzheimer's disease (AD; a brain disease that slowly loses the memory and ability to think, learn, and communicate).

Why is Donepezil taken at night?

Aricept is only taken at night because it can cause rapid or sluggish heartbeat, which can lead to fainting in some patients. Patients will sleep through the side effects if they take it before bed.

Does Donepezil improve memory?

Donepezil is a drug that is used to treat Alzheimer's disease-related confusion (dementia). It is not a cure for Alzheimer's disease, but it can help with memory, perception, and work. This medicine is an enzyme inhibitor that acts by restoring the balance of natural substances in the brain (neurotransmitters).

How does Donepezil work?

Donepezil functions by assisting nerve cells in interacting with one another. It accomplishes this by preventing the degradation of acetylcholine in your brain. Acetylcholine is a critical component for nerve communication. Donepezil isn't a treatment for dementia.

How good is Donepezil?

Donepezil is more effective than placebo at improving the main symptoms of this disease and is well tolerated. While stabilization of cognitive and functional symptoms with donepezil may also be considered a significant clinical result, improvements are generally modest. Donepezil can make life easier for caregivers.

Is Donepezil an antidepressant?

Donepezil is a cholinesterase inhibitor, and has antidepressant-like properties in the C57BL/6J mouse FST. These results may have consequences for clinical studies, since donepezil may be repurposed as an antidepressant.

What are the side effects of donepezil 10 mg?

The most common side effects of donepezil 10mg include

  • Nausea
  • Diarrhea
  • Not sleeping well
  • Vomiting
  • Muscle cramps
  • Tiredness
  • Bruising

Does Donepezil cause depression?

Because of the potential role of the cholinergic pathway in mediating mood, cholinesterase inhibitors like donepezil (Aricept) may temporarily prevent the development of mild cognitive impairment, but they may also exacerbate symptoms of depression.

What time should onepezil be taken?

Unless your doctor advises you otherwise, donepezil should be taken at bedtime. It can be eaten with or without food, either on an empty or full stomach. Completely swallow the tablet.

Disclaimer: The information provided herein is accurate, updated and complete as per the best practices of the Company. Please note that this information should not be treated as a replacement for physical medical consultation or advice. We do not guarantee the accuracy and the completeness of the information so provided. The absence of any information and/or warning to any drug shall not be considered and assumed as an implied assurance of the Company. We do not take any responsibility for the consequences arising out of the aforementioned information and strongly recommend you for a physical consultation in case of any queries or doubts.