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\u30106\u3011\u307e\u3068\u3081<\/p>\n\n\n\n
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<\/p>\n\n\n\n
Dementia medications must be chosen appropriately depending on the underlying cause and the nature of the symptoms. Below is a detailed explanation based on current medical knowledge and clinical practice, focusing primarily on Alzheimer\u2019s disease (AD), but also including dementia with Lewy bodies (DLB) and vascular dementia (VaD).<\/p>\n\n\n\n
[1] Classification of Dementia Medications (Available in Japan as of 2025)<\/p>\n\n\n\n
\u25c9 Drugs that improve or maintain cognitive function (\u201canti-dementia drugs\u201d)<\/p>\n\n\n\n
Donepezil (Aricept)<\/p>\n\n\n\n
Galantamine (Reminyl)<\/p>\n\n\n\n
Rivastigmine (Rivastach, Exelon Patch)<\/p>\n\n\n\n
Memantine (Memary)<\/p>\n\n\n\n
\u25c9 Drugs for behavioral and psychological symptoms of dementia (BPSD)<\/p>\n\n\n\n
Often used off-label<\/p>\n\n\n\n
Antipsychotics (e.g., quetiapine, risperidone)<\/p>\n\n\n\n
Antidepressants (e.g., SSRIs, mirtazapine)<\/p>\n\n\n\n
Anticonvulsants (e.g., valproic acid)<\/p>\n\n\n\n
[2] Choosing Medication by Dementia Type<\/p>\n\n\n\n
\u2460 Alzheimer\u2019s Disease (AD)<\/p>\n\n\n\n
The most common type. Cholinergic neuron degeneration is central, so cholinesterase inhibitors (ChE-Is) are the first-line treatment.<\/p>\n\n\n\n
Mild to moderate stage:<\/p>\n\n\n\n
Donepezil: Most widely used, flexible dosing.<\/p>\n\n\n\n
Galantamine: Also works via nicotinic receptors\u2014may help improve attention.<\/p>\n\n\n\n
Rivastigmine: Available as a patch\u2014helpful for patients with swallowing difficulties or poor adherence.<\/p>\n\n\n\n
Moderate to severe stage:<\/p>\n\n\n\n
Memantine: NMDA receptor antagonist. Helps with agitation and hyperactivity.<\/p>\n\n\n\n
Combination of Donepezil + Memantine is often used at this stage.<\/p>\n\n\n\n
\u2461 Dementia with Lewy Bodies (DLB)<\/p>\n\n\n\n
Characterized by hallucinations, parkinsonism, and autonomic dysfunction. Patients are often sensitive to medications.<\/p>\n\n\n\n
First choice: Donepezil (shown to reduce hallucinations)<\/p>\n\n\n\n
Memantine is used cautiously\u2014can cause over-sedation or worsen hallucinations.<\/p>\n\n\n\n
Antipsychotics must be used minimally and very cautiously (e.g., low-dose quetiapine).<\/p>\n\n\n\n
\u2462 Vascular Dementia (VaD)<\/p>\n\n\n\n
Caused by cerebrovascular events. No definitive drugs, but ChE-Is may be used in mixed AD\/VaD cases.<\/p>\n\n\n\n
Donepezil may help in some cases.<\/p>\n\n\n\n
Primary focus is on managing vascular risk factors: hypertension, dyslipidemia, diabetes.<\/p>\n\n\n\n
If apathy or depression is prominent, mirtazapine or dopaminergic agents (e.g., methylphenidate) may be considered.<\/p>\n\n\n\n
\u2463 Frontotemporal Dementia (FTD)<\/p>\n\n\n\n
Marked by emotional dysregulation, disinhibition, and stereotyped behavior. ChE-Is are generally ineffective and may worsen symptoms.<\/p>\n\n\n\n
Anti-dementia drugs are generally not recommended.<\/p>\n\n\n\n
Low-dose antipsychotics or antidepressants are used to manage behavioral symptoms.<\/p>\n\n\n\n
[3] Drug Characteristics and Selection Tips<\/p>\n\n\n\n
\u25c9 Donepezil (Aricept)<\/p>\n\n\n\n
Increases brain acetylcholine by inhibiting cholinesterase.<\/p>\n\n\n\n
Versatile\u2014can be used in both AD and DLB.<\/p>\n\n\n\n
Side effects: Nausea, diarrhea, appetite loss (especially early on).<\/p>\n\n\n\n
\u25c9 Galantamine (Reminyl)<\/p>\n\n\n\n
Dual action: cholinesterase inhibition + nicotinic receptor modulation.<\/p>\n\n\n\n
May improve alertness and focus.<\/p>\n\n\n\n
Side effects: May cause insomnia or night-time awakenings.<\/p>\n\n\n\n
\u25c9 Rivastigmine (Rivastach \/ Exelon Patch)<\/p>\n\n\n\n
Inhibits both central and peripheral cholinesterase.<\/p>\n\n\n\n
Patch form is good for patients with swallowing issues or poor medication adherence.<\/p>\n\n\n\n
Side effects: Skin irritation, body odor changes.<\/p>\n\n\n\n
\u25c9 Memantine (Memary)<\/p>\n\n\n\n
NMDA receptor antagonist\u2014reduces excitotoxicity.<\/p>\n\n\n\n
Especially useful for agitation, aggression, or BPSD.<\/p>\n\n\n\n
Use with caution in elderly or those with renal impairment.<\/p>\n\n\n\n
[4] Medications for BPSD (Behavioral and Psychological Symptoms of Dementia)<\/p>\n\n\n\n
When behavioral symptoms (e.g., aggression, hallucinations, wandering, insomnia) are more problematic than cognitive decline, anti-dementia drugs alone are often insufficient. Off-label medications are used, such as:<\/p>\n\n\n\n
Quetiapine: First choice for hallucinations and delusions\u2014relatively safe in DLB.<\/p>\n\n\n\n
Risperidone: Effective for acute aggression\u2014but carries a risk of stroke.<\/p>\n\n\n\n
Mirtazapine: Improves appetite, mood, and sleep\u2014useful for patients with depression and weight loss.<\/p>\n\n\n\n
Valproic acid: May help with agitation or irritability\u2014evidence is limited.<\/p>\n\n\n\n
[5] Practical Algorithm for Medication Selection<\/p>\n\n\n\n
Identify the type of dementia: AD \/ DLB \/ VaD \/ FTD<\/p>\n\n\n\n
If cognitive symptoms dominate \u2192 use anti-dementia drugs<\/p>\n\n\n\n
If behavioral symptoms dominate \u2192 add antipsychotics or antidepressants<\/p>\n\n\n\n
Monitor for side effects like nausea, weight loss, skin issues<\/p>\n\n\n\n
Adjust the regimen based on tolerability and patient\/family goals<\/p>\n\n\n\n
\u2705 Conclusion<\/p>\n\n\n\n
There is no \u201cone best medication\u201d for dementia. The key is personalized selection based on dementia type, symptom profile, and patient characteristics.<\/p>\n\n\n\n
Early intervention is more effective for cognitive preservation, while later stages require careful balancing of behavioral symptoms and safety.<\/p>\n\n\n\n
The ultimate goal is to preserve quality of life (QOL) while minimizing side effects and maintaining patient dignity.<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
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