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Donepezil

Alzheimer Disease

DRUG STATUS

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Approvals

US(FDA), UK(BNF)

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Essential Medicine

YES

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Teratogenicity

N/A

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Pharmaceutical Class

Cholinesterase Inhibitor

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Drug Ingredient

Donepezil

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Summary

  • Donepezil is used to treat symptoms of dementia caused by Alzheimer's disease, such as memory loss, confusion, and difficulty in thinking.

  • Donepezil works by increasing the levels of a neurotransmitter called acetylcholine in the brain. This neurotransmitter is involved in memory and learning. In Alzheimer's disease, acetylcholine levels are lower, so Donepezil helps improve communication between brain cells, which can improve memory and thinking.

  • You start by taking one 5 mg Donepezil tablet daily in the evening before bed. After 4 to 6 weeks, you can increase the dose to 10 mg once daily. You can take Donepezil with or without food.

  • Common side effects of Donepezil include diarrhea, loss of appetite, vomiting, nausea, and bruising. These side effects usually go away after a while and don't require any changes to the dosage. However, about 13% of patients had to stop taking the medicine due to side effects.

  • Donepezil should be avoided by individuals who are allergic to Donepezil or any of its ingredients, have a history of heart problems, stomach ulcers or gastrointestinal issues, and a history of seizures or other neurological disorders. Always consult a doctor before starting Donepezil.

Indications and Purpose

What is Donepezil used for?

Donepezil hydrochloride tablets are a medication used to treat people with dementia caused by Alzheimer's disease. It helps to improve symptoms like memory loss, confusion, and difficulty thinking.

How does Donepezil work?

Donepezil works by increasing the levels of acetylcholine, a neurotransmitter in the brain that is involved in memory and learning. In Alzheimer's disease, acetylcholine levels are lower, so Donepezil helps improve communication between brain cells, which can improve memory, thinking, and daily function.

Is Donepezil effective?

Donepezil hydrochloride is a medication that can help improve memory and thinking in people with certain types of dementia. In this study, people taking donepezil hydrochloride showed significant improvement in their cognitive performance, as measured by the Severe Impairment Battery (SIB), compared to people taking a placebo.

How does one know if Donepezil is working?

To assess the effectiveness of donepezil hydrochloride, a two-part evaluation strategy is used. **Part 1: Cognitive Function** * The cognitive subscale of the Alzheimer's Disease Assessment Scale (ADAS-cog) is used to measure cognitive function, such as memory, thinking, and language skills. **Part 2: Overall Function** * Caregivers provide their assessment of the patient's overall function, including daily living activities and social behavior, using the Clinician's Interview-Based Impression of Change (CIBIC-plus).

Directions for Use

How do I take Donepezil?

You can take Donepezil hydrochloride tablets with or without food. It doesn't matter if you take it with food or not.

For how long do I take Donepezil?

Donepezil is typically used for the long term in treating Alzheimer's disease, often for several months to years . Initial treatment usually starts at 5 mg daily, which can be increased to 10 mg after a few weeks. Some patients may continue using donepezil effectively for few years , depending on individual response and tolerance. 

How long does it take for Donepezil to start working?

Donepezil may take several weeks to show noticeable improvements in symptoms like memory and cognition. Full effects can take 6-12 weeks or longer, depending on the individual. It's important to continue taking it as prescribed and follow up with your doctor.

How should I store Donepezil?

Keep the product in a cool place, between 68° and 77° Fahrenheit.

Warnings and Precautions

Who should avoid taking Donepezil?

Donepezil should be avoided by individuals who:

  1. Are allergic to Donepezil or any of its ingredients.
  2. Have a history of heart problems, especially slow heart rate or irregular heartbeat.
  3. Have stomach ulcers or gastrointestinal issues.
  4. Have a history of seizures or other neurological disorders.

Always consult a doctor before starting Donepezil, especially if you have any of these conditions.

Can I take Donepezil with other prescription drugs?

Some medicines can affect how Donepezil works. Ketoconazole and quinidine can slow down the breakdown of Donepezil in the body, which can lead to higher levels of Donepezil in the body. The effects of this are not fully understood.

Can I take Donepezil with vitamins or supplements?

Donepezil can generally be taken with vitamins or supplements, but it’s important to avoid certain interactions. For example, antioxidant supplements like vitamin E and C may interfere with Donepezil’s effectiveness. Always inform your doctor about any vitamins or supplements you are taking to ensure there are no interactions.

Can Donepezil be taken safely while pregnant?

There is no information on whether donepezil hydrochloride tablets can harm an unborn baby during pregnancy. Studies in animals have not shown developmental problems when the medicine was given during pregnancy. However, giving the medicine to rats during the last part of pregnancy and while nursing resulted in more stillbirths and fewer surviving offspring. This occurred at doses similar to those used in humans.

Can Donepezil be taken safely while breastfeeding?

Information on donepezil, a medication, and breastfeeding is limited. While there is no data on the presence of donepezil in breast milk or its effects on the baby, the benefits of breastfeeding should be weighed against any potential risks. The mother's need for the medication and her overall health should also be considered.

Is Donepezil safe for the elderly?

Donepezil has not been proven safe or effective for children. For adults over 65, the starting dose is 5 mg daily in the evening. After 4-6 weeks, the dose can be increased to 10 mg daily if tolerated. Nausea and vomiting are more common at the 10 mg dose. Monitor closely after starting or increasing the dose. Bradycardia (slow heart rate), heart block, and fainting are possible side effects, particularly for those with heart problems. Report fainting immediately.