Child reaching for pills on a high shelf, symbolizing the dangers of accidental medication ingestion.

When Medicine Becomes Misadventure: A Toddler's Accidental Overdose

Reese Marlowe monogram
Reese Marlowe in Health & Wellness October 2026 • 3 min read.

"A Case Report on Cholinergic Crisis and Tetraplegia Following Pyridostigmine Intoxication"


Medication safety is paramount, especially in households with young children. While medications are intended to heal and improve quality of life, accidental ingestion can lead to severe and life-threatening consequences. This article explores a case report that highlights the dangers of accidental pyridostigmine overdose in a toddler, shedding light on the rapid onset of cholinergic crisis and the importance of immediate medical intervention.

Pyridostigmine is a medication commonly prescribed to treat myasthenia gravis, an autoimmune disorder that causes muscle weakness. It works by preventing the breakdown of acetylcholine, a neurotransmitter that helps muscles contract. While it's a crucial medication for those who need it, pyridostigmine can be extremely dangerous if ingested accidentally, particularly by children.

In this article, we will delve into a case where a 2.5-year-old boy experienced a severe reaction after ingesting his mother's pyridostigmine medication, which lead to cholinergic crisis and tetraplegia.

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Poisoning Response and Cholinergic Toxicity

The San Francisco EMSA pediatric poisoning protocol describes a narrow circumstance for an ingestion-related intervention: the ingestion must be non-acid, non-caustic, and non-petroleum, occur within one hour, and involve a child older than one year. The supplied protocol excerpt does not specify the intervention’s effectiveness or broader limitations. Cholinergic crisis is described as potentially life-threatening and associated with excess acetylcholine, often following high doses or excessive administration of anticholinesterase drugs. Reported features include weakness, increased secretions, miosis, autonomic effects, and possible respiratory failure.

A Changing Opioid Risk Landscape for Youth

A 2026 review in *Pediatrics in Review* describes adolescent and young-adult experimentation with pills and powders as increasingly risky amid an unpredictable drug supply characterized by fentanyl contamination. The review reports that youth opioid overdose deaths have more than doubled since 2019. It also identifies overdose as the third leading cause of death among U.S. children and adolescents. These findings frame a recent shift in the risks facing young people.

The Case: A Toddler's Unexpected Crisis

Child reaching for pills on a high shelf, symbolizing the dangers of accidental medication ingestion.

The case report details how a 2.5-year-old boy accidentally ingested his mother's pyridostigmine, a medication she took for myasthenia gravis. At the time of discovery, 19 tablets (totaling 1140mg) were missing, and the child admitted to ingesting them. Within an hour, the toddler's condition rapidly deteriorated.

The symptoms progressed quickly, leading to:

  • Vomiting and loss of muscle tone
  • Presentation to the hospital in a tetraplegic condition (paralysis of all four limbs)
  • Drooling and increased bronchial secretions
  • Miosis (excessive constriction of the pupils)
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Calls for Pediatric-Specific Opioid Guidance

A 2024 review of acute opioid overdose in pediatric patients notes that opioid overdose has historically been associated with adults, while trends show an increasing incidence among pediatric patients. The review calls for a multifaceted response, including the creation of pediatric-specific guidelines, to address the crisis among children and reduce morbidity and mortality from opioid overdoses. A 2024 Society of Critical Care Medicine review also covers poisons and toxidromes, including cholinergic, anticholinergic, sympathomimetic, and opioid presentations, and discusses toxic effects and treatment options.

Pediatric Cholinesterase Poisoning

The CDC/ATSDR resource presents a figure showing the frequency of pediatric signs and symptoms in cholinesterase poisoning. A separate report describes an infant who developed acute cholinergic syndrome; its supplied excerpt notes that donepezil and other acetylcholinesterase inhibitors are among the most commonly prescribed medications for Alzheimer’s disease. The excerpts do not provide comparable symptom frequencies or enough detail to compare the infant’s presentation with the broader pediatric data.

Despite these alarming symptoms, the toddler's respiratory muscle function and circulatory functions remained stable, which was a crucial factor in his eventual recovery.

Key Takeaways: Prevention and Vigilance

This case underscores the critical importance of safe medication storage and handling, especially in households with young children. Medications should always be stored out of reach and sight of children, preferably in locked cabinets or containers.

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Case Report of Rivastigmine Poisoning

A case report describes a pediatric patient with rivastigmine poisoning and a full cholinergic syndrome. The reported effects involved nicotinic, muscarinic, and central features. The case required supportive or intensive care, illustrating the serious care needs that can accompany this reported presentation.

Research, Guidance, and Prevention

A commentary in *Pediatric Research* points to work by Kelly and colleagues describing trends and geographic variation in drug overdose deaths among young children, addressing an important gap. A 2024 article proposes anticipatory guidance as a familiar framework pediatricians can use to equip adolescents and families with knowledge and skills to respond to rising adolescent overdose deaths. Together, these sources highlight research on pediatric patterns and prevention through clinical guidance.

Pediatric Overdose Within a Wider Crisis

One source argues that pediatric opioid exposure patterns mirror adult patterns, while noting that pediatric poisoning rates differ in magnitude from adult overdose rates. It describes these similar trends as evidence of the crisis’s systemic nature. A separate policy-focused article argues that efforts to reduce overdose mortality must include pediatric populations, since efforts have largely focused on teenagers and adults.

Parents and caregivers should be educated about the potential dangers of accidental ingestion and the importance of seeking immediate medical attention if it occurs.

While this case had a positive outcome, the rapid onset of severe symptoms highlights the need for vigilance and proactive measures to prevent accidental medication overdoses in children. Raising awareness and promoting safe medication practices are essential steps in protecting our youngest and most vulnerable populations.

What the comparison cases add

These reports show that childhood exposures to cholinesterase-inhibitor medicines have not all followed the same course: some children were managed at home, while the reported hospital cases included varied symptoms and care. They do not establish how those cases compare in severity with the pyridostigmine intoxication described in the article.[1]

A report of a young child who took donepezil and memantine describes hallucinations and seizure-like activity without signs of cholinergic syndrome, and treatment without atropine. This illustrates that an ingestion involving these medicines does not by itself establish a cholinergic presentation.[1]

How related ingestion reports differ

A broader report covers symptomatic children after acetylcholinesterase-inhibitor ingestions, with most managed at home and only one hospitalized child reported as receiving atropine. These accounts offer context for pediatric exposures, but they do not establish a common course or treatment pattern for pyridostigmine intoxication.[1]

What these reports leave unresolved

  • The donepezil literature described here does not explain how childhood ingestions should be treated, and the available evidence is scarce. It therefore does not resolve how the reported cases should inform interpretation of a pyridostigmine overdose.[1]

Terms used in the ingestion reports

Acute cholinergic syndrome
A syndrome associated with ingestion of acetylcholinesterase inhibitors and increased secretions, among other effects.[1]

Sources

  1. Occurrence of acute cholinergic syndrome in an infant due to donepezil ingestion (pmc.ncbi.nlm.nih.gov)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

Everything You Need To Know

1

What is Pyridostigmine and what is its purpose?

Pyridostigmine is a medication primarily used to treat myasthenia gravis, an autoimmune disorder that causes muscle weakness. It works by inhibiting the breakdown of acetylcholine, a neurotransmitter essential for muscle contraction. In the context of this case, the accidental ingestion of pyridostigmine by a toddler resulted in a severe reaction because the medication, while beneficial for those with myasthenia gravis, is toxic at high doses, leading to a cholinergic crisis and tetraplegia.

2

What is a cholinergic crisis, and what were the signs of it in the toddler?

A cholinergic crisis is a severe overstimulation of the cholinergic system, typically caused by an overdose of medications like pyridostigmine that increase acetylcholine levels. The toddler's symptoms, including vomiting, loss of muscle tone, tetraplegia (paralysis of all four limbs), drooling, increased bronchial secretions, and miosis (constriction of the pupils), are all indicative of this crisis. The severity of the cholinergic crisis in this case highlights the dangers of medication safety and the rapid impact of pyridostigmine overdose in young children.

3

What is tetraplegia, and how did it relate to the toddler's condition?

Tetraplegia, also known as quadriplegia, is the paralysis of all four limbs. In this case, the toddler developed tetraplegia as a direct result of the cholinergic crisis caused by pyridostigmine overdose. The paralysis underscores the dangerous effects that can result from accidental ingestion of this medication. The fact that his respiratory and circulatory functions remained stable was crucial for his survival and recovery.

4

What is the key takeaway about medication safety from this case?

The case highlights the critical importance of medication safety, especially in households with young children. It is vital to store medications, such as pyridostigmine, out of sight and reach of children, ideally in locked cabinets or containers. This will help prevent accidental ingestion and the severe health consequences that can follow, like the cholinergic crisis and tetraplegia seen in the toddler. Careful medication storage is a crucial step in protecting children from potentially life-threatening situations.

5

Why was immediate medical intervention so important in this situation?

The immediate medical intervention was vital for the toddler's eventual recovery. While the article doesn't explicitly detail the treatment, the fact that the child's respiratory muscle and circulatory functions remained stable played a key role in his recovery. Prompt medical attention and supportive care are essential when dealing with pyridostigmine overdose, as it can lead to severe complications, including the cholinergic crisis and subsequent tetraplegia. This case underscores the importance of seeking immediate medical help if accidental ingestion is suspected.

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