# Treatment options for Lewy body dementia
Lewy body dementia requires a cautious approach in which treatment is primarily aimed at relieving symptoms and maintaining quality of life. The disease responds differently to medications than other forms of dementia, and some standard treatments can cause unexpected serious side effects. This tab describes the main treatments by symptom group.
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Cognitive symptoms
Cognitive decline is an important part of the disease, but there are few treatments that can slow it down.
Cholinesterase inhibitor (donepezil, rivastigmine)
ProveniIncluded in official guidelines, or approved by EMA or FDA
These medications increase the level of acetylcholine in the brain, a messenger substance involved in memory and attention. They work by blocking the enzyme that breaks down acetylcholine. In Lewy body dementia, cholinesterase inhibitors can help against confusion, attention problems and perceptual symptoms.
Known side effects are nausea, vomiting, diarrhea and sometimes heart rhythm abnormalities. These medications are usually introduced gradually and also withdrawn cautiously. They do not offer a cure and do not stop the decline, but can bring some improvement in approximately one third to one half of patients.
Memantine
ProveniIncluded in official guidelines, or approved by EMA or FDA
Memantine protects nerve cells against damage by the neurotransmitter glutamate. It is often used for moderate to severe cognitive complaints. It can help support attention and daily functioning.
Possible side effects are dizziness, confusion, headache and insomnia. This medication is also introduced and withdrawn gradually.
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Movement symptoms and parkinsonism
In many patients, parkinsonian features occur: slowness, rigidity and tremor.
Levodopa (L-DOPA)
ProveniIncluded in official guidelines, or approved by EMA or FDA
Levodopa is a precursor of dopamine, a messenger substance needed for smooth movements. It is the most effective treatment for parkinsonian symptoms. However, in Lewy body dementia it does not always work and can cause unwanted side effects.
Many patients with Lewy body dementia tolerate levodopa poorly or do not respond well. Possible side effects are confusion, hallucinations, nausea, heart rhythm abnormalities and movement disorders (involuntary movements). Therefore, treatment usually starts with cautious dosing and is regularly monitored for benefit and effects.
Dopamine agonists (bromocriptine, pramipexole, ropinirole)
ProveniIncluded in official guidelines, or approved by EMA or FDA
These medications directly imitate dopamine in the brain. They are sometimes used for parkinsonian symptoms, but cause psychotic symptoms even more often in Lewy body dementia (hallucinations, delusions) than levodopa. They are therefore considered cautiously and only in low doses, and usually not as a first choice.
Side effects include hallucinations, confusion, drowsiness, heart rhythm disorders and involuntary movements.
Monoamine oxidase inhibitor (selegiline)
ProveniIncluded in official guidelines, or approved by EMA or FDA
This medication blocks an enzyme that breaks down dopamine, which increases dopamine in the brain. It is sometimes used as adjunctive treatment for parkinsonian symptoms, especially in earlier stages.
Side effects are usually mild but can include insomnia, anxiety and headache. When combined with certain other medications, serious interactions can occur.
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Hallucinations and psychotic symptoms
These are frequent and distressing symptoms in Lewy body dementia.
Pimavanserin
ProveniIncluded in official guidelines, or approved by EMA or FDA
Pimavanserin is specially designed for psychosis in Parkinson's disease and Lewy body dementia. It works via serotonin receptors and does not block dopamine, which is why it does not cause worsening of parkinsonian symptoms.
It is one of the preferred medications for hallucinations and delusions in this condition. Possible side effects are heart rhythm abnormalities (QT prolongation), nausea, dizziness and fatigue. Regular monitoring of heart rhythm (ECG) is recommended.
Quetiapine (atypical antipsychotic)
ProveniIncluded in official guidelines, or approved by EMA or FDA
This medication is widely used for hallucinations and agitation. However, patients with Lewy body dementia are very sensitive to side effects of antipsychotics.
Possible side effects are severe motor deterioration (rigidity, parkinsonism), sedation, distorted sensory perception, stiffness, tremor and even potentially life-threatening complications. It is used only in very low doses and under close supervision, if at all.
Clozapine (atypical antipsychotic)
ProveniIncluded in official guidelines, or approved by EMA or FDA
Clozapine can be effective against psychotic symptoms and leads less often to movement disorders than other antipsychotics. However, it requires regular blood tests (because it can disturb blood cell production) and is reserved for severe cases where other options have not helped.
Possible side effects are sedation, orthostatic hypotension (sudden drop in blood pressure upon standing), weight gain, inflammation of the salivary glands and very rarely life-threatening blood disorders (agranulocytosis). Intensive monitoring is required.
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Sleep disturbances, REM sleep behavior
REM sleep behavior (acting out dreams) and other sleep problems are very common.
Melatonin
ResearchediPositive results in clinical studies, not yet standard treatment
Melatonin is a natural hormone that regulates the sleep-wake cycle. In REM sleep behavior it can help reduce nightly violent movements and behaviors.
Side effects are generally mild: daytime sleepiness, headache, dizziness and nausea. It is well tolerated, but effectiveness varies greatly between patients.
Clonazepam
ProveniIncluded in official guidelines, or approved by EMA or FDA
This is a benzodiazepine that effectively suppresses REM sleep behavior. It is widely used and well researched for this specific symptom.
Possible side effects are sleepiness, fatigue, dizziness, coordination problems and dependence (tolerance after prolonged use). In elderly patients the risk of falls may increase. It is started cautiously and regularly reconsidered whether it remains necessary.
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Blood pressure problems
Many patients have orthostatic hypotension (dizziness and fainting upon standing) or other blood pressure variations.
Midodrine
ProveniIncluded in official guidelines, or approved by EMA or FDA
This medication raises blood pressure by constricting blood vessels. It helps counteract orthostatic hypotension and reduces the risk of falls and syncope (fainting).
Possible side effects are tingling sensations in hands and feet, heart palpitations, itching sensation in blood vessels and headache. It works better in sitting or lying position and less well when already standing; therefore it is started with attention to timing.
Fludrocortisone
ProveniIncluded in official guidelines, or approved by EMA or FDA
This steroid hormone increases blood volume and helps maintain blood pressure while standing. It can be used in combination with other measures for severe orthostatic hypotension.
Side effects are weight gain, swelling (edema) in legs and feet, headaches with muscle and leg pain. Regular monitoring of potassium and blood pressure is needed.
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Mood symptoms and anxiety
Depression, anxiety and apathy are frequent and can be more pronounced than in other forms of dementia.
SSRIs (selective serotonin reuptake inhibitor: citalopram, sertraline, paroxetine)
ProveniIncluded in official guidelines, or approved by EMA or FDA
These antidepressants increase serotonin in the brain and are used for depression, anxiety and obsessive-compulsive thoughts. They can also help against hallucinations and compulsive behavior.
Possible side effects are nausea, sleepiness or conversely insomnia, sexual dysfunction, tremor, headache and electrolyte disturbance (hyponatremia). Citalopram can cause heart rhythm abnormalities at high doses and is therefore used in limited doses, especially in elderly patients.
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Supportive and research-focused
Cognitive training and lifestyle measures
ResearchediPositive results in clinical studies, not yet standard treatment
Research shows that regular cognitive activity, physical exercise, sleep hygiene, and social contact may help slow cognitive decline and limit symptoms in patients in earlier stages (including the prodromal stage, before overt dementia). The effects are modest and vary from person to person.
These are classified supportive measures without medicinal side effects, although implementing them does require effort from the patient and their environment.
ACP-204 (experimental antipsychotic)
ExperimentaliOngoing in study setting, outcome still unknown
ACP-204 is a new medication specifically designed for psychosis in Lewy body dementia. It is in clinical trial phase (phase 2-3) and is undergoing evaluation for safety and efficacy. Preliminary data suggest control of hallucinations without worsening of motor functions, but availability is limited to research protocols.
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Bosutinib (experimental, targeting underlying disease pathology)
ExperimentaliOngoing in study setting, outcome still unknown
This medication targets Src kinase, a protein suspected of being involved in inflammatory processes and protein accumulation in Lewy body dementia. It is currently being studied to establish safety, side effects, and effects on biomarkers and clinical symptoms.
This is fundamental research; results are not yet definitive and the medication is not available outside study settings.
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Medications to be avoided
Antipsychotics in general
Advised againstiProven ineffective or harmful, or dangerous in combination with your treatment
(with the exception of pimavanserin and clozapine in selected cases)
Most antipsychotics (for example, haloperidol, risperidone, olanzapine) are strongly discouraged in Lewy body dementia, because they cause severe, sometimes permanent motor deterioration and can increase the risk of death. This differs clearly from Alzheimer's dementia.
Tricyclic antidepressants
Advised againstiProven ineffective or harmful, or dangerous in combination with your treatment
These older antidepressants have anticholinergic activity, which can worsen cognition, impair urinary retention, and aggravate confusion. SSRIs are preferred.
Certain antihistamines and other anticholinergic medications
Advised againstiProven ineffective or harmful, or dangerous in combination with your treatment
Medications with anticholinergic effects (such as certain antihistamines, urinary bladder relaxants, certain movement disorder medications) can worsen confusion, hallucinations, and cognitive decline.
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Future perspectives in research
Recent studies focus on inflammatory processes (microglial activation), misfolded proteins (Lewy bodies, tau, TDP-43) and refined neuroimaging methods. Although these insights hold promise for future treatments targeting underlying causes (disease-modifying therapies), there are currently no proven preventive or reversing treatments available. Much research focuses on earlier detection and intervention in the prodromal stage (before clinical dementia).
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