Going to the ER with Lewy Body Dementia

Emergency rooms are not designed for people with Lewy body dementia. The environment is loud, bright, and unpredictable, and staff are often unfamiliar with LBD and its specific medication sensitivities. Decisions get made quickly, and in a crisis, the wrong medication can cause serious harm.

A review published in Alzheimer’s Research & Therapy reported that 64% of LBD caregivers had dealt with a crisis in the past year, and the emergency room was the most common place they went for help. Going to the ER with Lewy body dementia is something most caregivers will face at some point, and preparing for that visit before it happens is one of the most useful things you can do.

Why the ER Is Risky for People with LBD

The biggest risk in an emergency room setting is medication. People with Lewy body dementia can have severe, sometimes life-threatening reactions to medications that are routinely given to other patients in emergency situations.

Traditional antipsychotics like haloperidol, commonly known as Haldol, are among the most dangerous. Many people with LBD who are given these drugs have a severe reaction known as neuroleptic sensitivity, which can include extreme sedation, a sudden worsening of movement problems, increased confusion, dangerous drops in blood pressure, and in some cases a condition called neuroleptic malignant syndrome, which can be fatal.

The problem is that ER physicians may reach for these drugs when a patient is agitated, confused, or experiencing hallucinations or delusions. These are common reasons that people with LBD end up in the ER in the first place, and the standard response in an emergency setting may be to sedate the patient quickly. For someone with LBD, that standard response can cause a medical emergency on top of the one that brought them in.

Anti-anxiety medications and certain anti-nausea drugs also carry risks for people with LBD, and some common sleep aids and bladder medications, including ones sold over the counter, have anticholinergic effects that can worsen confusion and thinking.

What to Prepare Before an Emergency Happens

The time to prepare for an ER visit is now, while things are stable. Waiting until you are in the middle of a crisis means you will be trying to recall details and advocate for your loved one at the same time.

1. Create an emergency information sheet. This should include your loved one’s full name, date of birth, LBD diagnosis, the name and phone number of their neurologist, a complete list of current medications with dosages, a list of medications that must be avoided (including haloperidol and risperidone), and any known allergies.

2. Carry a Medical Alert Card. Our free printable Medical Alert Card tells emergency staff that your loved one has Lewy body dementia and warns them to avoid traditional antipsychotics such as haloperidol (Haldol), the anti-nausea drug prochlorperazine (Compazine), and other medications like Valium, Benadryl, and Ambien that can cause serious reactions. Fill in your loved one’s details, print several copies, and keep them in your wallet, your car, and near the front door.

3. Ask for a medication alert in the medical record. Ask your loved one’s neurologist to add a note to their medical record stating that they have Lewy body dementia and must avoid traditional antipsychotics such as haloperidol. Many hospital systems display these alerts when medications are ordered, which gives you a safeguard that does not depend on you being in the room.  For utmost safety, relay that your loved one is allergic to Haldol.

4. Keep your neurologist’s contact information accessible. ER physicians who are unfamiliar with LBD may be willing to consult with a specialist before making medication decisions if you can provide a phone number on the spot. 

What to Do When You Arrive at the ER

As soon as you arrive, tell the triage nurse that your loved one has Lewy body dementia and is extremely sensitive to certain medications. Hand them the Medical Alert Card and emergency information sheet. Say the words clearly and make sure they are documented in the chart before your loved one is seen by a physician.

When the physician arrives, repeat the same information. Do not assume that what you told the triage nurse has been communicated. Emergency rooms are busy, handoffs are imperfect, and critical details can get lost between shifts. If at any point someone mentions giving your loved one an antipsychotic, anti-anxiety, or sedating medication, ask them to consult with your loved one’s neurologist first.

Stay with your loved one if at all possible. People with LBD can become more confused and agitated in unfamiliar environments, especially under bright lights with unfamiliar faces. Your presence is calming and also ensures that no medication is administered without your awareness.

If your loved one is being admitted to the hospital from the ER, make sure the LBD diagnosis and medication restrictions are transferred to the admitting team. The same risks that apply in the ER apply on the hospital floor, and the information needs to follow your loved one through every transition.

Common Reasons People with LBD End Up in the ER

Falls are one of the most frequent reasons people with LBD are taken to the emergency room. LBD affects balance, coordination, and blood pressure regulation, all of which increase the risk of falling. A fall that results in a head injury, broken bone, or significant pain often requires emergency evaluation.

Sudden worsening of confusion or behavior is another common trigger. Families sometimes interpret this as rapid disease progression, but sudden changes in someone with LBD often have a treatable medical cause. Urinary tract infections, dehydration, constipation, and unmanaged pain can all cause delirium that looks like a dramatic worsening of dementia symptoms, so ask the ER team to check for these before any changes are made to LBD medications.

Severe hallucinations or delusions that create a safety risk, such as attempting to leave the house, becoming aggressive, or refusing to eat or drink, may also lead to an ER visit. In these situations, the goal is to stabilize the person safely without using medications that could cause a worse reaction.

What Medications Are Safer in an Emergency

When medication is truly needed to manage severe agitation or psychosis in the ER, doctors familiar with LBD usually choose quetiapine or clozapine at the lowest possible dose, because these drugs are less likely to trigger the severe reactions caused by older antipsychotics. A 2023 review in the Canadian Journal of Hospital Pharmacy notes that the evidence for both drugs in LBD is limited, so they still carry risks. Clozapine also requires regular blood tests, which makes it less practical to start in an emergency.

Cholinesterase inhibitors, which your loved one may already be taking, can help with behavioral symptoms over time but are not fast-acting enough for an emergency situation.

The most important thing is that the ER team knows about the diagnosis and understands the risks before making any medication decisions. If they are unsure, they should consult with a neurologist who has experience with LBD. Our medication safety guide covers which drugs to avoid and why in more detail.

Helpful Resources

• LBDRC Medical Alert Card – a free printable card to show ER staff, with medication warnings
• LBDRC Medication Safety Guide – which medications to avoid in LBD and why
• NIA Caring for a Person with Lewy Body Dementia – the National Institute on Aging’s guide for caregivers, including what to tell hospital staff about medication sensitivity

Frequently Asked Questions

Can Haldol be given to someone with Lewy body dementia? Haloperidol, commonly known as Haldol, should be avoided in people with LBD. It is a traditional antipsychotic that can cause severe neuroleptic sensitivity reactions, including dangerous sedation, worsening movement problems, and potentially fatal complications. If your loved one is in the ER and a physician suggests Haldol, ask them to use a safer alternative and consult with your loved one’s neurologist.

What should I bring to the ER? Bring a current medication list with dosages, the name and phone number of your loved one’s neurologist, a filled-in Medical Alert Card, and a list of medications that must be avoided. Having these prepared in advance saves critical time during an emergency.

Why did my loved one suddenly get worse? Sudden worsening of confusion or behavioral symptoms in LBD is often caused by an underlying medical issue rather than disease progression. Urinary tract infections, dehydration, constipation, and pain are common triggers that can cause a rapid decline in cognitive function. These are treatable, and ruling them out should be the first step.

Our helpline is available every day from 8am to 8pm Eastern time at 516-218-2026 or 833-LBD-LINE. If you need help preparing for a potential ER visit, finding specialists in your area, or talking through a situation you are currently dealing with, we are here