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Recognizing and Responding to Extrapyramidal Symptoms from Antipsychotics in Dementia

Extrapyramidal symptoms (EPS) are movement-related side effects that can occur when antipsychotic medications are used in dementia, especially in vulnerable brains like those with Lewy body disease or Parkinson's. These symptoms can look like Parkinson's disease—shaking, stiffness, shuffling walk, or uncontrollable movements of the mouth or tongue—and can be frightening for both you and your loved one. The good news is that many of these symptoms are reversible if caught early, and there are concrete steps you can take to monitor, report, and advocate for safer care. This guide will help you understand what to watch for, how to talk to the doctor, and what to do if symptoms appear.

Key points

  • Extrapyramidal symptoms (EPS) are movement side effects from antipsychotics that can mimic Parkinson's disease: tremor, stiffness, shuffling gait, and uncontrollable mouth or tongue movements.
  • People with Lewy body dementia or Parkinson's disease dementia are at extremely high risk for EPS and should avoid most antipsychotics, especially typical ones like haloperidol.
  • EPS can be reversible if caught early, but tardive dyskinesia can become permanent. Early detection is critical.
  • Keep a daily log of any new movement changes and report them to the doctor immediately. Do not stop the drug suddenly.
  • Non-drug approaches should always be tried first to reduce the need for antipsychotics. Address pain, hunger, boredom, and environmental triggers.
  • Always discuss the risks and benefits with the doctor, and ask for a clear plan for monitoring and deprescribing.

What Are Extrapyramidal Symptoms and Why Do They Happen?

Extrapyramidal symptoms (EPS) are movement disorders caused by medications that block dopamine receptors in the brain. Antipsychotics work by reducing dopamine activity, which can help with hallucinations or agitation, but in some people—especially those with dementia—this blockade goes too far and disrupts the brain's ability to control movement. The result can look like Parkinson's disease: tremors, muscle stiffness, a shuffling walk, or a blank facial expression. These are called 'pseudoparkinsonism' because they mimic Parkinson's. Other EPS include acute dystonia (sudden muscle spasms, often in the neck or eyes), akathisia (intense restlessness, an inability to sit still), and tardive dyskinesia (repetitive, uncontrollable movements of the mouth, tongue, or face). Tardive dyskinesia can become permanent even after the drug is stopped, and it may actually worsen when the antipsychotic is withdrawn. Older adults are at higher risk for these effects, and the risk is especially high in people with Lewy body dementia or Parkinson's disease dementia, who have almost no tolerance for dopamine blockade.

Why People with Dementia Are Especially Vulnerable

The brains of people with dementia—particularly Lewy body dementia and Parkinson's disease dementia—have already lost a significant number of dopamine-producing cells. By the time of diagnosis, 60 to 80 percent of these cells may be gone. This means the brain has very little reserve to handle any further dopamine blockade. Even low doses of antipsychotics can trigger severe EPS, including worsening of parkinsonism, increased falls, confusion, and sedation. In Lewy body dementia, the therapeutic window is extremely narrow: the dose that might help with psychosis is often the same dose that causes severe movement problems. This is why antipsychotics are generally not recommended for elderly patients with dementia unless absolutely necessary, and why the FDA has issued black box warnings about increased risk of stroke and death in this population. If your loved one has Lewy body dementia or Parkinson's, the risk of EPS is so high that many experts recommend avoiding typical antipsychotics entirely and using only very low doses of certain atypicals like quetiapine or clozapine, and only after non-drug approaches have failed.

The Different Types of EPS You Might See

EPS can appear in several forms, and they can come on suddenly or develop over weeks. Acute dystonia is a sudden, sustained muscle spasm—often of the neck (torticollis), eyes (oculogyric crisis, where the eyes roll upward), or back (opisthotonos). This is a medical emergency and requires immediate attention. Akathisia is a feeling of inner restlessness that makes the person pace, rock, or fidget constantly—it can be mistaken for agitation, leading to more medication, which makes it worse. Pseudoparkinsonism includes tremor, rigidity (stiffness), bradykinesia (slowness of movement), and a shuffling gait. Tardive dyskinesia is a late-onset movement disorder involving repetitive, involuntary movements of the tongue, lips, face, and sometimes limbs—it can be irreversible. In dementia, even subtle changes like a new tremor, a change in walking pattern, or a new difficulty with swallowing or feeding oneself can be signs of EPS. If you notice your loved one 'getting weird' in the afternoon, grabbing onto door frames, or suddenly unable to feed themselves, this could be EPS, not a worsening of dementia.

General caregiving information, not medical advice. Check medications and major care changes with your clinician.

Step-by-step

  1. Keep a daily log of movement changes. Write down the date, time, and what you see: Is there a new tremor in the hands? Is the person shuffling more than usual? Are they having trouble swallowing or feeding themselves? Are they pacing or fidgeting? Use a notebook or a notes app. This log is your evidence when you talk to the doctor.

  2. If you suspect EPS, do not stop the antipsychotic suddenly. Abrupt withdrawal can cause a rebound worsening of psychosis or even a withdrawal-emergent dyskinesia. Instead, call the prescribing doctor immediately and share your observations. Say: 'I am seeing new movement problems since starting this medication. Can we review the dose or consider a different drug?'

  3. Ask the doctor for a formal EPS assessment. The doctor can use a simple rating scale like the Abnormal Involuntary Movement Scale (AIMS) or the Simpson-Angus Scale. Request that this be done before starting any antipsychotic and then periodically during treatment. If the doctor is not familiar, ask for a referral to a geriatric psychiatrist or a neurologist.

  4. If the person has Lewy body dementia or Parkinson's disease dementia, ask the doctor to avoid typical antipsychotics (like haloperidol) and to use only very low doses of quetiapine or clozapine, if any antipsychotic is needed at all. These are considered safer for this population, though evidence is limited. Discuss the risks and benefits thoroughly.

  5. Work with the doctor to lower the dose or switch to a less risky medication. Many EPS are dose-related and may improve with a lower dose. If the person is on a high-potency antipsychotic like haloperidol or risperidone, ask about switching to a lower-potency option like quetiapine. However, note that even 'atypical' antipsychotics can cause EPS, especially at higher doses.

  6. If EPS are mild, the doctor may prescribe an anticholinergic medication like benztropine or diphenhydramine to control symptoms. However, these drugs have their own risks in dementia—they can worsen confusion, cause constipation, and increase fall risk. Use only under close supervision and for the shortest time possible.

  7. If EPS are severe or include acute dystonia (e.g., eye rolling, neck spasm), seek emergency medical care. In the ER, the doctor can give an injection of an anticholinergic like benztropine or diphenhydramine, which usually resolves the dystonia quickly. Tell the ER staff about all medications the person is taking.

  8. If tardive dyskinesia develops, ask the doctor about newer treatments like valbenazine (Ingrezza) or deutetrabenazine (Austedo). These are FDA-approved for tardive dyskinesia and can reduce the involuntary movements. However, they are not a cure and may have side effects. Discuss with a neurologist or movement disorder specialist.

  9. Implement non-drug strategies to reduce the need for antipsychotics in the first place. Address pain, constipation, hunger, thirst, or boredom—these can cause agitation that looks like psychosis. Use calming routines, reduce noise, ensure adequate lighting, and provide meaningful activities. The goal is to use the lowest effective dose for the shortest time, and to stop the drug if EPS appear.

  10. Monitor for falls and swallowing difficulties. EPS can cause unsteady gait and trouble swallowing, leading to aspiration pneumonia. If you notice the person is choking more often or has a wet-sounding voice after eating, tell the doctor immediately. Consider a speech therapy evaluation for swallowing safety.

What not to do

  • Do not ignore subtle movement changes, thinking they are just part of aging or dementia. A new tremor, shuffling walk, or difficulty feeding oneself can be EPS, not progression of the disease. Early detection can prevent permanent damage.

  • Do not assume that 'atypical' antipsychotics are completely safe from EPS. While they are less likely to cause EPS than older drugs like haloperidol, they still carry risk, especially at higher doses and in vulnerable brains. Risperidone and olanzapine, for example, have been linked to EPS and abnormal gait in dementia studies.

  • Do not increase the dose of an antipsychotic to treat what looks like agitation, if the agitation might actually be akathisia. Akathisia (inner restlessness) can look like pacing, fidgeting, or irritability. More antipsychotic will only worsen the akathisia. Instead, report the behavior to the doctor and ask for an EPS assessment.

  • Do not stop the antipsychotic abruptly without medical guidance. Sudden withdrawal can cause a rebound of psychosis, withdrawal dyskinesia, or even neuroleptic malignant syndrome. Always taper under a doctor's supervision.

  • Do not use anticholinergic drugs for EPS without considering the risks in dementia. Drugs like benztropine can worsen confusion, cause constipation, and increase fall risk. They should be used only when EPS are significant and only for a short time, and the dose should be as low as possible.

  • Do not assume that if a person has Parkinson's disease, they cannot get EPS from antipsychotics. In fact, they are at extremely high risk. Even low doses of most antipsychotics can worsen parkinsonism, cause falls, and lead to rapid deterioration. Quetiapine at very low doses is sometimes used, but even that carries risk.

Practical tools

  • EPS Symptom Diary

    Create a simple chart with columns for date, time, and specific observations: tremor (which hand?), stiffness (arms, legs, neck?), gait (shuffling, freezing?), facial expression (masked?), swallowing (choking, drooling?), restlessness (pacing, fidgeting?), and any new involuntary movements (lip smacking, tongue thrusting, eye rolling). Bring this to every doctor visit. This turns vague complaints into actionable data.

  • The 'Ask Teepa' Script for Doctor Calls

    When you call the doctor, use this exact phrasing: 'Since starting [medication name and dose], I have noticed [specific movement change]. I am concerned this might be an extrapyramidal symptom. Can we review the dose or consider a different medication? I have been keeping a log and can share it with you.' This is respectful, specific, and prompts a clinical response.

  • The AIMS Exam at Home (Observation Only)

    You can watch for signs of tardive dyskinesia by asking the person to sit with hands on knees, mouth open, and tongue out. Look for any involuntary movements of the tongue, lips, jaw, or fingers. Do not diagnose—just note what you see and report to the doctor. Do this weekly if the person is on an antipsychotic.

  • Fall Prevention Setup

    If EPS causes unsteady gait, immediately reduce fall risk: remove throw rugs, ensure clear pathways, use non-slip socks or shoes, install grab bars in bathroom, use a walker if needed, and keep a nightlight on. Consider a bed alarm if the person gets up at night unsteadily. Report falls to the doctor right away.

  • Swallowing Safety Checklist

    If EPS affects swallowing, watch for these signs: coughing or choking during meals, wet-sounding voice after eating, food pocketing in cheeks, or weight loss. Use thickened liquids if recommended by a speech therapist, and puree foods if needed. Sit the person upright for 30 minutes after eating. Never leave them alone while eating.

  • Non-Drug Agitation Toolkit

    To reduce the need for antipsychotics, have a ready toolkit: a favorite music playlist, a simple fidget blanket, a photo album to look at, a short walk, a warm drink, or a hand massage. These can calm agitation without drugs. Keep a list of what works for your loved one and use it first before calling the doctor for more medication.

Discuss with your clinician

Ask the doctor: 'What is the specific EPS risk for my loved one given their dementia type? Can we do a baseline AIMS exam before starting any antipsychotic?'

Ask: 'If EPS develops, what is our plan? Will we lower the dose, switch drugs, or stop entirely? Under what circumstances would we use an anticholinergic like benztropine?'

Ask: 'Is there a safer alternative to an antipsychotic for the target symptom? Could an antidepressant, a mood stabilizer, or a non-drug approach work instead?'

Ask: 'How long do you expect to keep my loved one on this medication? What is the plan for tapering or discontinuing it?'

If tardive dyskinesia is suspected, ask: 'Should we consider a medication like valbenazine or deutetrabenazine? What are the risks and benefits in dementia?'

Ask: 'How often should we monitor for EPS and other side effects? Can we schedule follow-up visits every two weeks initially?'

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