A 76-year-old woman in Florida developed a terrifying and extraordinarily rare condition: she became convinced that she was dead, despite being conscious, breathing, and speaking to the doctors treating her.
She repeatedly insisted that her heart had stopped beating and that she needed to be brought back to life.
But this wasn’t a supernatural event or simply an unusual psychological episode.
Doctors eventually discovered that her bizarre beliefs were likely connected to a powerful antibiotic commonly used in hospitals.
The medication, called cefepime, had apparently triggered a serious neurological reaction in a patient whose kidneys were already severely damaged.
Her experience, documented in a medical case report published in August 2025 and highlighted again in October 2026, reveals a disturbing but important medical phenomenon: certain medications can sometimes affect brain function so profoundly that patients temporarily lose their sense of reality.
She Told Doctors She Was Dead — But Her Heart Was Still Beating
The woman had been receiving treatment for complications following surgery on her right ankle.
Her recovery had been difficult. A surgical wound had reopened, infection had developed, and she also had a heel ulcer.
Doctors were additionally treating symptoms of a urinary tract infection.
Because of these infections, she received cefepime, a broad-spectrum antibiotic frequently used to treat serious bacterial infections in hospitalized patients.
The woman had several underlying medical conditions, including type 2 diabetes, high blood pressure, atrial fibrillation, and end-stage kidney disease requiring regular hemodialysis.
When she initially arrived at the hospital, she was alert, oriented, and showed no signs of a psychiatric disorder.
Then something extraordinary happened.
She suddenly began expressing the belief that she was no longer alive.
Despite being able to communicate with medical staff, she insisted that her heart was not beating.
She even requested to be revived.
Her statements were not jokes or expressions of ordinary fear. She appeared genuinely convinced that she had died.
Doctors recognized that she was experiencing a rare psychiatric phenomenon known as Cotard syndrome, sometimes called walking corpse syndrome.
But what had caused it?
What Is Cotard Syndrome, or Walking Corpse Syndrome?
Cotard syndrome is an extremely rare neuropsychiatric condition characterized by a delusional belief that a person is dead, does not exist, or has lost essential body parts or organs.
Some patients believe their blood has disappeared. Others insist their internal organs have stopped functioning.
In severe cases, individuals may become convinced that they are no longer alive, even while walking, speaking, and interacting with others.
The condition was named after French neurologist Jules Cotard, who described similar symptoms in the late nineteenth century.
Cotard syndrome has been reported in association with several medical and psychiatric conditions, including:
- Severe depression with psychotic symptoms
- Schizophrenia and other psychotic disorders
- Neurological diseases and brain injuries
- Certain forms of dementia
- Encephalitis and other neurological disturbances
- Medication-related brain dysfunction
However, the syndrome itself is exceptionally uncommon.
And in this particular case, doctors suspected that the patient’s symptoms had an unusual cause: an adverse reaction to an antibiotic.
The Unexpected Suspect: A Widely Used Hospital Antibiotic
Cefepime belongs to a class of antibiotics called fourth-generation cephalosporins.
It is administered intravenously and is commonly used in hospitals to treat potentially serious bacterial infections, including complicated urinary tract infections, pneumonia, and certain bloodstream or wound infections.
The medication is particularly useful because it works against a broad range of bacteria.
For most appropriately selected patients, cefepime is an effective and valuable treatment.
However, it has a recognized potential side effect known as cefepime-induced neurotoxicity.
Neurotoxicity occurs when a substance interferes with normal nervous system function.
In susceptible individuals, cefepime can affect the brain and produce symptoms ranging from mild confusion to serious neurological complications.
These may include:
- Sudden confusion or disorientation
- Changes in consciousness
- Unusual behavior or agitation
- Hallucinations
- Involuntary muscle jerking
- Speech difficulties
- Seizures
- Severe encephalopathy
The risk is especially important in people with impaired kidney function.
For this 76-year-old patient, that vulnerability was central to the medical investigation.
Why Kidney Disease Made Her Especially Vulnerable
One of the most important facts about cefepime is that it is eliminated primarily through the kidneys.
In people with normal kidney function, the body can generally clear the medication at the expected rate.
But when kidney function is severely reduced, cefepime may remain in the bloodstream longer and accumulate unless the dose and timing are carefully adjusted.
This can increase the amount of medication reaching the central nervous system.
Researchers believe cefepime may interfere with the activity of gamma-aminobutyric acid, commonly known as GABA.
GABA is an inhibitory neurotransmitter that helps regulate electrical activity in the brain.
By interfering with certain GABA receptors, cefepime can contribute to excessive neuronal activity and neurological dysfunction.
The risk is particularly concerning in older adults and patients with advanced kidney disease.
A 2017 systematic review examining 135 reported cases of cefepime neurotoxicity found that approximately 80% involved patients with kidney dysfunction.
Common manifestations included reduced consciousness, confusion, and abnormal muscle movements.
Importantly, neurotoxicity has occasionally occurred even when clinicians adjusted cefepime doses for reduced kidney function.
This means careful monitoring remains essential.
Her Brain Scans Looked Normal — But Another Test Revealed a Problem
When the woman developed the delusion that she was dead, doctors began investigating possible neurological and metabolic causes.
Routine laboratory testing and medical imaging failed to reveal an obvious explanation for her dramatic change in mental state.
However, a test called an electroencephalogram, or EEG, provided an important clue.
An EEG measures electrical activity in the brain using electrodes placed on the scalp.
The woman’s EEG showed abnormalities consistent with toxic-metabolic encephalopathy.
This term refers to brain dysfunction associated with factors such as medications, toxins, organ failure, or metabolic disturbances.
Unlike a tumor or a large stroke, toxic-metabolic encephalopathy may not produce a visible structural abnormality on routine brain imaging.
The EEG findings, combined with her medical history and medication exposure, strengthened the suspicion that cefepime was contributing to her symptoms.
Doctors then took steps to address the suspected medication toxicity.
What Happened When Doctors Stopped the Antibiotic?
After identifying cefepime as a likely contributor, the medical team discontinued the antibiotic.
The patient also underwent hemodialysis, a procedure that removes waste products and certain medications from the bloodstream when the kidneys cannot adequately perform that function.
Dialysis can help clear cefepime from the body in patients with severe kidney impairment.
Following discontinuation of the medication and dialysis, the woman’s unusual neurological and psychiatric symptoms improved rapidly.
Her belief that she was dead resolved.
The improvement strongly supported the doctors’ suspicion of cefepime-related neurotoxicity.
However, because the evidence comes from a single medical case report, it cannot establish with absolute certainty that cefepime alone caused the syndrome.
The timing of the symptoms, abnormal EEG findings, and recovery after treatment nevertheless provided a compelling clinical explanation.
The case was described by physicians associated with the University of Central Florida College of Medicine and HCA Healthcare’s graduate medical education program in Gainesville.
Their report highlighted an exceptionally rare presentation of antibiotic-associated neurological toxicity.
This Wasn’t the First Time an Antibiotic Made Someone Believe They Were Dead
Although the Florida woman’s experience was extraordinary, similar cases have appeared in medical literature.
In a case report published in December 2023, physicians described a 48-year-old woman who developed neurological symptoms while receiving cefepime.
After experiencing changes in awareness and speech, she began insisting that she had suffered a heart attack and was now dead.
She even questioned how doctors could draw blood from her if she was no longer alive.
Her symptoms eventually resolved after cefepime was discontinued.
Other published reports have described similar Cotard-like delusions associated with certain medications, particularly in patients whose kidneys could not adequately eliminate the drugs or their metabolites.
These cases suggest that severe disturbances in brain chemistry can sometimes produce profound alterations in a person’s perception of existence.
However, such reactions remain extremely rare, and most patients receiving cefepime never experience anything resembling Cotard syndrome.
7 Warning Signs of Antibiotic-Related Neurotoxicity
Although the belief that someone is dead is an exceptionally unusual manifestation, other symptoms of cefepime-related neurological toxicity are more frequently reported.
Recognizing these warning signs may be particularly important for older adults, hospitalized patients, and individuals with kidney disease.
1. Sudden confusion
A person who was previously alert may become disoriented or have difficulty recognizing their surroundings.
2. Unusual drowsiness
Excessive sleepiness, reduced responsiveness, or difficulty remaining awake may indicate changes in brain function.
3. Hallucinations
Some patients may begin seeing or hearing things that are not present.
4. Involuntary muscle movements
Sudden, brief muscle jerks, known as myoclonus, can occur with cefepime neurotoxicity.
5. Difficulty speaking
Patients may develop unusual speech patterns, difficulty producing words, or impaired communication.
6. Seizures
In severe cases, cefepime can trigger seizure activity, including nonconvulsive status epilepticus, which may occur without obvious shaking movements.
7. Sudden personality or behavioral changes
Unexpected agitation, unusual beliefs, or dramatic behavioral changes may indicate delirium or another form of neurological dysfunction.
These symptoms are not specific to cefepime and may have many possible causes.
However, new confusion, seizures, reduced consciousness, or other major neurological changes during antibiotic treatment require urgent medical assessment.
Patients should not independently stop a prescribed antibiotic without medical guidance, because untreated serious infections can also be dangerous.
Are Older Adults More Sensitive to Medication Side Effects?
Aging can affect the way the body processes and eliminates medications.
Kidney function frequently declines with age, although the degree varies significantly between individuals.
Older adults may also have multiple medical conditions and take several medications simultaneously.
This combination can increase the risk of drug interactions, adverse reactions, and medication accumulation.
In hospitalized older adults, sudden confusion is often described as delirium.
Delirium can develop for many reasons, including infection, dehydration, metabolic imbalances, medication effects, and organ dysfunction.
Because several causes may occur simultaneously, identifying the exact trigger can be challenging.
The Florida patient’s case demonstrates why reviewing recent medication changes is an essential part of evaluating sudden alterations in mental status.
Can Antibiotics Affect the Brain Even When Kidney Function Is Normal?
Yes, although the risk varies by medication and patient characteristics.
Cefepime-associated neurotoxicity is more strongly associated with kidney impairment, but cases have been documented in people without severe kidney disease.
Other factors, including critical illness, changes in the blood-brain barrier, and underlying neurological disorders, may influence susceptibility.
Still, serious neurological reactions remain uncommon relative to the widespread clinical use of antibiotics.
For patients with reduced kidney function, clinicians can lower risk by adjusting doses appropriately and monitoring for changes in neurological status.
There is no reason for people to avoid medically necessary antibiotic treatment solely because of this unusual case report.
What This Rare Case Teaches Us About Brain Health
The connection between the kidneys, medications, and brain function is more complex than many people realize.
The kidneys do more than remove waste from the bloodstream.
They also help regulate fluid balance, electrolytes, and the elimination of numerous medications.
When kidney function becomes severely impaired, certain substances can accumulate and affect other organs, including the brain.
This is why medical teams must consider kidney function when prescribing medications that rely heavily on renal elimination.
The Florida patient’s experience also illustrates how dramatic psychiatric symptoms can sometimes result from an underlying medical problem.
A person suddenly expressing unusual beliefs may be experiencing delirium, medication toxicity, or another neurological condition rather than a primary psychiatric illness.
Careful evaluation is necessary to distinguish these possibilities.
The Bottom Line
A 76-year-old Florida woman developed one of the strangest symptoms imaginable: she became convinced that she was dead.
Her heart was beating, she was conscious, and she could speak with her doctors, yet she believed she no longer existed.
Medical testing eventually pointed toward a rare form of cefepime-associated neurological toxicity, complicated by severe kidney disease.
After doctors discontinued the antibiotic and treated her with dialysis, her symptoms resolved rapidly.
The case is a powerful reminder that medications capable of treating serious illnesses can sometimes produce unexpected adverse effects, particularly in vulnerable patients.
It also reinforces an important medical principle: sudden changes in thinking, behavior, or consciousness should never be dismissed without considering possible physical causes.
Sometimes, a symptom that appears purely psychological may be the first warning sign of a serious but potentially reversible medical complication.
Medical disclaimer: This article is intended for educational purposes and does not replace professional medical advice. Anyone experiencing sudden confusion, seizures, hallucinations, or changes in consciousness should receive prompt medical evaluation.
