Boron toxicity - Revision history

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Ostermayer: Created page with "==Background== Boron toxicity results from exposure to boron-containing compounds, most commonly '''boric acid''' (H₃BO₃) and '''borax''' (sodium tetraborate decahydrate)Hadrup N, Frederiksen M, Sharma AK. Toxicity of boric acid, borax and other boron containing compounds: a review. ''Regul Toxicol Pharmacol''. 2021;121:104873. PMID 33485927. Common sources of exposure: **Insecticides/pesticides (ant baits, cockroach powder — most common..."

2026-03-13T11:43:59Z

Created page with "==Background== *Boron toxicity results from exposure to boron-containing compounds, most commonly '''boric acid''' (H₃BO₃) and '''borax''' (sodium tetraborate decahydrate)<ref name="hadrup">Hadrup N, Frederiksen M, Sharma AK. Toxicity of boric acid, borax and other boron containing compounds: a review. ''Regul Toxicol Pharmacol''. 2021;121:104873. PMID 33485927.</ref> *Common sources of exposure: **Insecticides/pesticides (ant baits, cockroach powder — most common..."

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==Background==
*Boron toxicity results from exposure to boron-containing compounds, most commonly '''boric acid''' (H₃BO₃) and '''borax''' (sodium tetraborate decahydrate)<ref name="hadrup">Hadrup N, Frederiksen M, Sharma AK. Toxicity of boric acid, borax and other boron containing compounds: a review. ''Regul Toxicol Pharmacol''. 2021;121:104873. PMID 33485927.</ref>
*Common sources of exposure:
**Insecticides/pesticides (ant baits, cockroach powder — most common source in the ED)
**Vaginal suppositories (boric acid — accidental oral ingestion reported)
**Laundry products and cleaning agents (borax)
**Antiseptic solutions and wound care products (historical use)
**Industrial products (flame retardants, glass manufacturing, welding fluxes)
**Homemade "slime" products (borax-containing)
*Routes: oral ingestion (most common and most dangerous), dermal (through compromised skin), inhalation (occupational dust)
*Boric acid is readily absorbed from the GI tract (92–94% bioavailability); absorption through '''intact''' skin is minimal, but '''compromised skin''' (burns, wounds, diaper rash) allows significant systemic absorption<ref name="hadrup"/>
*Excreted primarily via the kidneys; ~50% of an oral dose eliminated within 12 hours<ref name="gasparini">Gasparini S, Donà C, Piccini E, et al. Unintentional boric acid exposure: a case report and boron level monitoring. ''Ital J Pediatr''. 2025;51:148. PMID 40399389.</ref>
*Estimated minimum lethal oral dose of boric acid:<ref name="atsdr">Agency for Toxic Substances and Disease Registry (ATSDR). ''Toxicological Profile for Boron''. Atlanta, GA: US Department of Health and Human Services; 2010.</ref>
**'''Infants:''' 2–3 g
**'''Children:''' 5–6 g
**'''Adults:''' 15–20 g
*However, a review of 784 boric acid poisonings (10–88 g ingested) found '''88% were asymptomatic''' and no fatalities, indicating significant individual variability<ref name="atsdr"/>
*There is '''no specific antidote''' — treatment is supportive with aggressive IV hydration
*Special populations at highest risk:
**'''Neonates/infants:''' Extremely low lethal dose; historical nursery epidemics from boric acid wound care caused multiple deaths
**'''Patients with renal impairment:''' Impaired clearance increases risk of toxic accumulation
**'''Burn patients / compromised skin:''' Systemic absorption through damaged skin can be fatal

==Clinical Features==
===Acute Ingestion===
*'''Gastrointestinal (earliest and most common):'''
**Nausea, vomiting (classically '''blue-green''' emesis), diarrhea (may also be blue-green), abdominal pain
**GI mucosal erosion/corrosive injury in large ingestions<ref name="singh">Singh H, Dhibar DP, Naidu GSRSNK. Life-threatening corrosive injury with hepato-renal-pulmonary failure in boric acid poisoning. ''Postgrad Med J''. 2022;98(1155):70-71. PMID 33472901.</ref>
*'''Dermatologic (characteristic):'''
**Diffuse erythematous rash on palms, soles, and buttocks — classically described as '''"boiled lobster" appearance'''<ref name="atsdr"/>
**Skin desquamation/exfoliation (may appear 1–2 days after exposure)
**Alopecia (with chronic exposure)
*'''Neurologic (severe toxicity):'''
**Headache, irritability, lethargy → tremor → seizures → coma
*'''Renal:''' Oliguria, acute renal failure
*'''Hepatic:''' Transaminitis, hepatic injury<ref name="singh"/>
*'''Cardiovascular (severe):''' Hypotension, cardiovascular collapse
*'''Metabolic:''' Metabolic acidosis
*'''Death''' results from respiratory failure, cardiovascular collapse, or multiorgan failure<ref name="atsdr"/>

===Timing===
*GI symptoms typically appear within 1–4 hours of ingestion
*'''If asymptomatic at 4 hours''' post-ingestion, significant toxicity from a single acute ingestion is unlikely
*Dermatologic findings may be delayed 1–2 days

===Dermal Exposure===
*Intact skin: minimal systemic absorption; local irritation possible
*Compromised skin: systemic absorption can occur and has been fatal in infants<ref name="hadrup"/>

===Inhalation===
*Borate dust → nasal/throat irritation, cough; systemic toxicity from inhalation alone is rare

==Differential Diagnosis==
*Other caustic/corrosive ingestions ([[Alkali ingestion|alkali]], [[Acid ingestion|acid]])
*[[Copper sulfate toxicity]] (also causes blue-green emesis)
*[[Iron Toxicity|Iron toxicity]] (GI hemorrhage, metabolic acidosis, multiorgan failure)
*[[Paraquat toxicity]] (corrosive injury with hepatorenal and pulmonary failure)<ref name="singh"/>
*[[Arsenic toxicity|Arsenic toxicity]] (GI symptoms, multiorgan failure)
*Erythroderma from other causes (drug reaction, [[Staphylococcal Scalded Skin Syndrome|staphylococcal scalded skin syndrome]], [[Toxic Epidermal Necrolysis|TEN]])
*[[Methanol toxicity]], [[Ethylene glycol toxicity]] (metabolic acidosis with organ damage)
*Viral gastroenteritis (mild cases)

==Evaluation==
===Workup===
*'''Fingerstick glucose''' — all patients with altered mental status
*'''BMP/CMP:''' Electrolytes, BUN/creatinine (renal function), glucose, bicarbonate (acidosis), liver enzymes
*'''CBC'''
*'''ABG/VBG:''' If metabolic acidosis suspected
*'''Urinalysis:''' Assess renal function
*'''ECG:''' Baseline; monitor for dysrhythmias
*'''CXR:''' If respiratory symptoms present
*'''Acetaminophen, salicylate levels:''' Screen for co-ingestants in all intentional ingestions
*'''Serum boron level:'''
**Can confirm exposure but is '''not widely available''' in most EDs
**'''Should NOT guide acute management''' — treat based on clinical presentation<ref name="gasparini"/>
**Levels > 340 μg/mL have been associated with fatalities
*'''Endoscopy:''' Consider if large ingestion with suspected corrosive injury to esophagus/stomach (consult GI)<ref name="singh"/>

===Diagnosis===
*Diagnosis is primarily '''clinical''' — based on history of exposure and characteristic findings (blue-green emesis, "boiled lobster" rash, GI symptoms)
*Serum boron levels confirm exposure but do not correlate reliably with severity and should not delay treatment
*'''Activated charcoal does NOT effectively adsorb boric acid''' — a negative charcoal response does not exclude the diagnosis<ref name="hadrup"/>
*Standard urine drug screens do not detect boron compounds
*Consider boron toxicity in unexplained erythroderma + GI symptoms, particularly in neonates/infants or patients with occupational/household exposure history

==Management==
*'''Airway:''' Protect if altered mental status; intubate for respiratory failure
*'''IV fluid resuscitation:''' '''This is the most important intervention''' — aggressive hydration enhances renal boron excretion (primary elimination pathway)<ref name="gasparini"/>
**Target urine output > 2 mL/kg/hr
*'''Continuous cardiac monitoring and pulse oximetry'''
*'''GI decontamination:'''
**'''Activated charcoal is NOT effective''' for boric acid (poorly adsorbed)<ref name="hadrup"/>
**'''Gastric lavage:''' Consider only for massive recent ingestions (within 1 hour) in symptomatic patients; not routinely recommended
**'''Whole bowel irrigation:''' May be considered for very large ingestions; limited evidence
*'''Dermal decontamination:''' Thorough irrigation with copious water; remove contaminated clothing
*'''Seizures:''' Benzodiazepines (lorazepam 0.1 mg/kg IV, or diazepam)
*'''Hypotension:''' IV fluid bolus; vasopressors (norepinephrine) if refractory
*'''Metabolic acidosis:''' Sodium bicarbonate if pH < 7.1 or hemodynamically significant
*'''Hemodialysis:'''<ref name="atsdr"/>
**Effectively removes boron (small molecule, low protein binding, low volume of distribution)
**'''Indications:''' Massive ingestion, renal failure limiting excretion, severe or worsening toxicity despite supportive care
**Consider early in severe cases rather than as a rescue measure

==Disposition==
*'''Discharge after 4-hour observation:'''
**Asymptomatic patients with small/accidental ingestion (e.g. taste of ant bait, accidental oral ingestion of vaginal suppository)
**Ensure adequate oral hydration at discharge
**Return precautions for delayed rash, GI symptoms, decreased urine output
*'''Admit:'''
**Any symptomatic patient (GI symptoms, rash, neurologic changes)
**Large intentional ingestions regardless of initial symptoms
**Pediatric patients with estimated ingestion > 200 mg/kg boric acid
**Evidence of renal impairment, metabolic acidosis, or hepatic injury
**Suspected corrosive injury requiring endoscopy
*'''ICU admission:'''
**Seizures, altered mental status, cardiovascular instability
**Renal failure requiring dialysis
**Multiorgan dysfunction
*'''Psychiatric evaluation:''' For all intentional ingestions after medical stabilization
*'''Poison Control:''' Consult for all significant exposures — '''1-800-222-1222'''

==See Also==
*[[Toxicology (Main)]]
*[[Caustic ingestion]]
*[[Iron toxicity]]
*[[Arsenic toxicity]]

==External Links==
*[https://pubmed.ncbi.nlm.nih.gov/33485927/ Toxicity of boric acid, borax and other boron containing compounds - Regul Toxicol Pharmacol 2021]
*[https://www.ncbi.nlm.nih.gov/books/NBK599075/ Toxicological Profile for Boron: Health Effects - ATSDR (NCBI)]
*[https://pubmed.ncbi.nlm.nih.gov/33472901/ Life-threatening corrosive injury in boric acid poisoning - Postgrad Med J 2022]
*[https://www.poison.org/articles/borates Borates, borax, and boric acid - Poison Control]
*[https://pmc.ncbi.nlm.nih.gov/articles/PMC12539190/ Unintentional boric acid exposure: case report with boron level monitoring - Ital J Pediatr 2025]

==References==
<references/>

[[Category:Toxicology]]

← Older revision		Revision as of 09:30, 22 March 2026
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	==Background==		==Background==
	*Boron toxicity results from exposure to boron-containing compounds, most commonly ~~'''~~boric acid~~'''~~ (H₃BO₃) and ~~'''~~borax~~'''~~ (sodium tetraborate decahydrate)<ref name="hadrup">Hadrup N, Frederiksen M, Sharma AK. Toxicity of boric acid, borax and other boron containing compounds: a review. ''Regul Toxicol Pharmacol''. 2021;121:104873. PMID 33485927.</ref>		*Boron toxicity results from exposure to boron-containing compounds, most commonly boric acid (H₃BO₃) and borax (sodium tetraborate decahydrate)<ref name="hadrup">Hadrup N, Frederiksen M, Sharma AK. Toxicity of boric acid, borax and other boron containing compounds: a review. ''Regul Toxicol Pharmacol''. 2021;121:104873. PMID 33485927.</ref>
	*Common sources of exposure:		*Common sources of exposure:
	**Insecticides/pesticides (ant baits, cockroach powder — most common source in the ED)		**Insecticides/pesticides (ant baits, cockroach powder — most common source in the ED)
Line 9:		Line 9:
	**Homemade "slime" products (borax-containing)		**Homemade "slime" products (borax-containing)
	*Routes: oral ingestion (most common and most dangerous), dermal (through compromised skin), inhalation (occupational dust)		*Routes: oral ingestion (most common and most dangerous), dermal (through compromised skin), inhalation (occupational dust)
	*Boric acid is readily absorbed from the GI tract (92–94% bioavailability); absorption through ~~'''~~intact~~'''~~ skin is minimal, but ~~'''~~compromised skin~~'''~~ (burns, wounds, diaper rash) allows significant systemic absorption<ref name="hadrup"/>		*Boric acid is readily absorbed from the GI tract (92–94% bioavailability); absorption through intact skin is minimal, but compromised skin (burns, wounds, diaper rash) allows significant systemic absorption<ref name="hadrup"/>
	*Excreted primarily via the kidneys; ~50% of an oral dose eliminated within 12 hours<ref name="gasparini">Gasparini S, Donà C, Piccini E, et al. Unintentional boric acid exposure: a case report and boron level monitoring. ''Ital J Pediatr''. 2025;51:148. PMID 40399389.</ref>		*Excreted primarily via the kidneys; ~50% of an oral dose eliminated within 12 hours<ref name="gasparini">Gasparini S, Donà C, Piccini E, et al. Unintentional boric acid exposure: a case report and boron level monitoring. ''Ital J Pediatr''. 2025;51:148. PMID 40399389.</ref>
	*Estimated minimum lethal oral dose of boric acid:<ref name="atsdr">Agency for Toxic Substances and Disease Registry (ATSDR). ''Toxicological Profile for Boron''. Atlanta, GA: US Department of Health and Human Services; 2010.</ref>		*Estimated minimum lethal oral dose of boric acid:<ref name="atsdr">Agency for Toxic Substances and Disease Registry (ATSDR). ''Toxicological Profile for Boron''. Atlanta, GA: US Department of Health and Human Services; 2010.</ref>
Line 16:		Line 16:
	**Adults: 15–20 g		**Adults: 15–20 g
	*However, a review of 784 boric acid poisonings (10–88 g ingested) found '''88% were asymptomatic''' and no fatalities, indicating significant individual variability<ref name="atsdr"/>		*However, a review of 784 boric acid poisonings (10–88 g ingested) found '''88% were asymptomatic''' and no fatalities, indicating significant individual variability<ref name="atsdr"/>
	*There is ~~'''~~no specific antidote~~'''~~ — treatment is supportive with aggressive IV hydration		*There is no specific antidote — treatment is supportive with aggressive IV hydration
	*Special populations at highest risk:		*Special populations at highest risk:
	**Neonates/infants: Extremely low lethal dose; historical nursery epidemics from boric acid wound care caused multiple deaths		**Neonates/infants: Extremely low lethal dose; historical nursery epidemics from boric acid wound care caused multiple deaths
Line 25:		Line 25:
	===Acute Ingestion===		===Acute Ingestion===
	*Gastrointestinal (earliest and most common):		*Gastrointestinal (earliest and most common):
	**Nausea, vomiting (classically ~~'''~~blue-green~~'''~~ emesis), diarrhea (may also be blue-green), abdominal pain		**Nausea, vomiting (classically blue-green emesis), diarrhea (may also be blue-green), abdominal pain
	**GI mucosal erosion/corrosive injury in large ingestions<ref name="singh">Singh H, Dhibar DP, Naidu GSRSNK. Life-threatening corrosive injury with hepato-renal-pulmonary failure in boric acid poisoning. ''Postgrad Med J''. 2022;98(1155):70-71. PMID 33472901.</ref>		**GI mucosal erosion/corrosive injury in large ingestions<ref name="singh">Singh H, Dhibar DP, Naidu GSRSNK. Life-threatening corrosive injury with hepato-renal-pulmonary failure in boric acid poisoning. ''Postgrad Med J''. 2022;98(1155):70-71. PMID 33472901.</ref>
	*Dermatologic (characteristic):		*Dermatologic (characteristic):
	**Diffuse erythematous rash on palms, soles, and buttocks — classically described as ~~'''~~"boiled lobster" appearance~~'''~~<ref name="atsdr"/>		**Diffuse erythematous rash on palms, soles, and buttocks — classically described as "boiled lobster" appearance<ref name="atsdr"/>
	**Skin desquamation/exfoliation (may appear 1–2 days after exposure)		**Skin desquamation/exfoliation (may appear 1–2 days after exposure)
	**Alopecia (with chronic exposure)		**Alopecia (with chronic exposure)
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	*Acetaminophen, salicylate levels: Screen for co-ingestants in all intentional ingestions		*Acetaminophen, salicylate levels: Screen for co-ingestants in all intentional ingestions
	*Serum boron level:		*Serum boron level:
	**Can confirm exposure but is ~~'''~~not widely available~~'''~~ in most EDs		**Can confirm exposure but is not widely available in most EDs
	**Should NOT guide acute management — treat based on clinical presentation<ref name="gasparini"/>		**Should NOT guide acute management — treat based on clinical presentation<ref name="gasparini"/>
	**Levels > 340 μg/mL have been associated with fatalities		**Levels > 340 μg/mL have been associated with fatalities
Line 78:		Line 78:

	===Diagnosis===		===Diagnosis===
	*Diagnosis is primarily ~~'''~~clinical~~'''~~ — based on history of exposure and characteristic findings (blue-green emesis, "boiled lobster" rash, GI symptoms)		*Diagnosis is primarily clinical — based on history of exposure and characteristic findings (blue-green emesis, "boiled lobster" rash, GI symptoms)
	*Serum boron levels confirm exposure but do not correlate reliably with severity and should not delay treatment		*Serum boron levels confirm exposure but do not correlate reliably with severity and should not delay treatment
	*Activated charcoal does NOT effectively adsorb boric acid — a negative charcoal response does not exclude the diagnosis<ref name="hadrup"/>		*Activated charcoal does NOT effectively adsorb boric acid — a negative charcoal response does not exclude the diagnosis<ref name="hadrup"/>
Line 86:		Line 86:
	==Management==		==Management==
	*Airway: Protect if altered mental status; intubate for respiratory failure		*Airway: Protect if altered mental status; intubate for respiratory failure
	*IV fluid resuscitation: ~~'''~~This is the most important intervention~~'''~~ — aggressive hydration enhances renal boron excretion (primary elimination pathway)<ref name="gasparini"/>		*IV fluid resuscitation: This is the most important intervention — aggressive hydration enhances renal boron excretion (primary elimination pathway)<ref name="gasparini"/>
	**Target urine output > 2 mL/kg/hr		**Target urine output > 2 mL/kg/hr
	*Continuous cardiac monitoring and pulse oximetry		*Continuous cardiac monitoring and pulse oximetry
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	**Multiorgan dysfunction		**Multiorgan dysfunction
	*Psychiatric evaluation: For all intentional ingestions after medical stabilization		*Psychiatric evaluation: For all intentional ingestions after medical stabilization
	*Poison Control: Consult for all significant exposures — ~~'''~~1-800-222-1222~~'''~~		*Poison Control: Consult for all significant exposures — 1-800-222-1222

	==See Also==		==See Also==