{
 "topic": "Drug Overdose",
 "slug": "drug-overdose",
 "category_id": 15265,
 "summary": "Why children are pharmacologically more vulnerable to overdose than adults, the toxidrome framework for recognizing the causative drug class, and specific detail on opioid overdose recognition and reversal.",
 "written_by": "claude-sonnet",
 "references": [
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   "author": "Arthur J. Nowak, John R. Christensen, Tad R. Mabry, Janice A. Townsend, Martha H. Wells",
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    123
   ]
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  {
   "title": "Pediatric Clinical Practice Guidelines and Policies",
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  {
   "title": "Pediatric Clinical Practice Guidelines & Policies, 18th Edition",
   "author": "American Academy of Pediatrics",
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  },
  {
   "title": "Kliegman R. Nelson Textbook of Pediatrics 2-Volume Set 22ed 2024",
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 ],
 "short": [
  {
   "title": "In short",
   "content": "- Each year more than 60,000 US children are brought to the ED for medication overdoses, with OTC medications implicated in more than 26,000 visits; about 90% of these ED visits follow unsupervised ingestion of prescription or OTC drugs, peaking in children under 5.\n- Children are pharmacologically more vulnerable to overdose than adults because of immature metabolic and organ function, a smaller therapeutic window for many drugs, age-based differences in drug absorption/metabolism/excretion, and the fact that most drugs prescribed to children have not actually been tested in children.\n- Because children are smaller, the \"maximal safe dose\" listed in standard adult drug references can be enough to overdose an undersized pediatric patient; age-based dosing formulas (Young's rule, Fried's rule) and weight-based formulas (Clark's rule) exist to scale adult doses down safely.\n- Toxidromes link a physical exam pattern to a drug class: anticholinergics (e.g., tricyclics, antihistamines) increase heart rate, blood pressure, and temperature, dilate pupils, and reduce sweating; opioids reduce heart rate, respiratory rate, temperature, and sweating, and constrict pupils; sympathomimetics (cocaine, amphetamines) increase all of heart rate, blood pressure, respiratory rate, temperature, and sweating with dilated pupils; sedative-hypnotics (anticonvulsants, benzodiazepines) reduce heart rate, respiratory rate, temperature, and sweating with no pupil effect.\n- Opiate overdose syndrome is the leading cause of death among substance users; clinical signs are stupor or coma, seizures, miotic pupils (unless severe anoxia has occurred), respiratory depression, cyanosis, and pulmonary edema, and it is often complicated by concurrent polydrug use.\n- IV naloxone 0.1 mg/kg (not to exceed 2 mg) both aids diagnosis (by dilating opiate-constricted pupils) and treats opiate overdose; diagnosis is confirmed by finding opiates in urine and/or serum.\n- Methadone is longer-acting and can be toxic at doses as low as 5 mg; the American Association of Poison Control Centers recommends close observation for any opioid-naive child who ingests more than 5 mg of methadone or any dose of an extended-release opioid.\n- Round-the-clock opioid dosing can produce dependence in a child within 5 days; dependence is a state of adaptation manifested by a drug-class-specific withdrawal syndrome on abrupt cessation, rapid dose reduction, falling blood drug level, or antagonist administration \u2014 guidance on recognizing and managing iatrogenic opioid withdrawal in children is currently lacking, unlike in adults.\n- Exposure to an environment where drugs of abuse (marijuana, cocaine, PCP, methamphetamine) are used or manufactured can itself be sufficient to cause severe intoxication in a child, so knowledge of substance-use epidemiology and manifestations matters when evaluating children of any age."
  }
 ],
 "long": [
  {
   "title": "Epidemiology",
   "content": "Each year, more than 60,000 children are brought to US emergency departments for medication overdoses, with over-the-counter medications implicated in more than 26,000 of these visits. About 90% of ED visits for medication overdose result from unsupervised ingestion of prescription and OTC drugs, with peak incidence in children under 5 years old. Opioid abuse and overdose deaths, while highest among adult non-Hispanic American Indian or Alaska Native individuals aged 35-44, have also significantly increased in children and adolescents."
  },
  {
   "title": "Etiology",
   "content": "Overdose in children most often results from unsupervised access to prescription or OTC medications in the home. Commonly abused OTC medications include cold medicines (pseudoephedrine), cough medicines (dextromethorphan), and analgesics (acetaminophen); commonly abused prescription medications include stimulants, opioids, sedatives, and anxiolytics. Risk factors for medication abuse include a family history of substance abuse, a personal history of or current substance use, peer pressure, and easy access to prescription drugs, whether the child's own or a family member's, often compounded by a lack of knowledge about potential harm. A child can also become severely intoxicated simply by being in an environment where drugs of abuse \u2014 marijuana, cocaine, PCP, methamphetamine \u2014 are used or manufactured."
  },
  {
   "title": "Pathophysiology",
   "content": "Children have fundamentally different pharmacologic vulnerability than adults because of immaturity of metabolic and organ function, smaller body weight and surface area, and a narrower therapeutic window for many drugs. Age-based variability in drug absorption, metabolism, and excretion, along with age-specific contraindications for certain medications, creates special vulnerability to overdose. Because children are smaller, the \"maximal safe dose\" listed in standard adult drug references can be sufficient to overdose an undersized pediatric patient; this is why age-based dosing formulas (Young's rule, Fried's rule) and, given the wide size variability among similarly aged children, weight-based dosing formulas such as Clark's rule were developed to scale an established adult dose down to a safe pediatric dose. Liquid medications labeled for home use also present a risk when converting from an ingredient amount to a volume for dosing."
  },
  {
   "title": "Clinical features",
   "content": "Toxidromes are characteristic clusters of central and autonomic nervous system findings that help identify the class of drug involved in an overdose. Anticholinergic agents (e.g., tricyclic antidepressants, antihistamines) increase heart rate and temperature, dilate the pupils, and reduce sweating, with no consistent effect on respiratory rate. Opioids (e.g., morphine, codeine) reduce heart rate, respiratory rate, temperature, and sweating, and constrict the pupils. Sympathomimetics (e.g., cocaine, amphetamines) increase heart rate, blood pressure, respiratory rate, and temperature, dilate the pupils, and increase sweating. Sedative-hypnotics (e.g., anticonvulsants, benzodiazepines) reduce heart rate, respiratory rate, and temperature, have no consistent pupillary effect, and reduce sweating. Opiate overdose syndrome specifically presents with stupor or coma, seizures, miotic (constricted) pupils \u2014 unless severe anoxia has occurred, in which case pupils may not be constricted \u2014 respiratory depression, cyanosis, and pulmonary edema, and is the leading cause of death among substance users; it is often complicated by concurrent use of multiple drugs."
  },
  {
   "title": "Diagnostics",
   "content": "Diagnosis of opiate toxicity is aided by intravenous naloxone 0.1 mg/kg (not to exceed 2 mg), which causes dilation of pupils that were constricted by the opiate. Diagnosis is confirmed by the finding of opiates in urine and/or serum. The differential diagnosis for an opiate-overdose-like presentation includes CNS trauma, diabetic coma, hepatic (and other) encephalopathy, Reye syndrome, and overdose of alcohol, barbiturates, PCP, or methadone. Drug testing is sometimes used as part of a substance-use assessment in children and adolescents, though clear indications and guidance for its use are limited, and testing of an older, competent adolescent should be voluntary."
  },
  {
   "title": "Treatment",
   "content": "Naloxone is both diagnostic and therapeutic for opiate overdose. Because methadone is longer-acting and can be toxic at doses as low as 5 mg, close observation is recommended by the American Association of Poison Control Centers for any opioid-naive child who ingests more than 5 mg of methadone, or any dose of an extended-release opioid formulation."
  },
  {
   "title": "Complications",
   "content": "Round-the-clock opioid dosing, even when prescribed appropriately for pain from a procedure, acute injury, or chronic condition, can produce opioid dependence in a child within 5 days. Dependence is defined as a state of adaptation manifested by a drug-class-specific withdrawal syndrome that can be produced by abrupt cessation, rapid dose reduction, a falling blood drug level, or administration of an antagonist. Although many children experience iatrogenically induced withdrawal mildly or it goes unreported, there is currently no specific guidance for recognizing or managing withdrawal in this population, unlike the guidance available for adults, particularly adults with substance use disorders. Opioid addiction itself results from a complex interplay of genetic predisposition, psychiatric pathology, and social forces such as poverty, joblessness, hopelessness, and despair."
  }
 ],
 "clinical": [
  {
   "title": "Recognizing the toxidrome",
   "content": "When a child presents with an unclear overdose, use the toxidrome pattern to narrow the likely drug class: increased heart rate, blood pressure, and temperature with dilated pupils and reduced sweating suggests an anticholinergic agent (tricyclic antidepressants, antihistamines); reduced heart rate, respiratory rate, and temperature with constricted pupils and reduced sweating suggests an opioid; increased heart rate, blood pressure, respiratory rate, temperature, and sweating with dilated pupils suggests a sympathomimetic (cocaine, amphetamines); and reduced heart rate, respiratory rate, and temperature with no pupillary change suggests a sedative-hypnotic (anticonvulsants, benzodiazepines). For suspected opioid overdose specifically, look for stupor or coma, seizures, miosis (unless anoxia has supervened), respiratory depression, cyanosis, and pulmonary edema, and keep in mind that polydrug use often complicates the picture."
  },
  {
   "title": "Managing suspected opioid overdose and dosing safety",
   "content": "Give intravenous naloxone 0.1 mg/kg (maximum 2 mg) for suspected opiate toxicity \u2014 pupillary dilation after administration supports the diagnosis, which can be confirmed with urine or serum testing for opiates. Treat any opioid-naive child who has ingested more than 5 mg of methadone, or any dose of an extended-release opioid, with close observation, since methadone's long duration of action makes even small doses dangerous. When dosing any medication for a child, remember that adult \"maximal safe dose\" references can overdose a smaller pediatric patient \u2014 use age- or weight-based pediatric dosing (Young's, Fried's, or Clark's rule) rather than extrapolating adult doses directly, and double-check liquid medication conversions from ingredient amount to volume. If a child has been on round-the-clock opioid dosing for several days, anticipate the possibility of dependence and withdrawal on cessation, even though specific pediatric withdrawal-management guidance is limited."
  }
 ]
}