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Cypermetherine poisoning management

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pyrethroid poisoning

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cypermethrin poisoning management poison center pyrethroid clinical management

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https://www.ncbi.nlm.nih.gov/books/NBK606124

Cypermethrin poisoning is managed mainly with decontamination, observation, and supportive care. There is no specific antidote. It can resemble organophosphate poisoning, so confirm the product label and do not give routine atropine or pralidoxime unless there is convincing cholinergic toxicity or a confirmed mixed organophosphate exposure.

Immediate actions

  1. Assess ABCs
    • Airway protection if reduced consciousness, recurrent seizures, heavy vomiting, or respiratory failure.
    • Oxygen and assisted ventilation as needed.
    • Monitor pulse, blood pressure, SpO₂, ECG, mental status, and temperature.
    • Establish IV access.
  2. Decontaminate
    • Remove contaminated clothing and wash skin well with soap and water.
    • Irrigate exposed eyes with clean water or saline for at least 15 minutes.
    • Inhalation exposure: move to fresh air and ventilate the area.
    • Healthcare workers should use gloves and avoid secondary contamination.
  3. After ingestion
    • Do not induce vomiting.
    • Activated charcoal may be considered only for a potentially significant, recent ingestion, usually within 1 hour, if the patient is alert with a protected airway and not vomiting.
    • Avoid charcoal if drowsy, convulsing, or vomiting because of aspiration risk.
    • Routine gastric lavage and whole-bowel irrigation are not recommended. StatPearls management guidance

Symptomatic treatment

ProblemManagement
Seizures, marked tremor, agitationIV benzodiazepine, for example diazepam or lorazepam, plus airway support if needed
Bronchospasm/wheezeInhaled beta-agonist such as salbutamol; treat severe allergic reaction as anaphylaxis
Nausea/vomitingAntiemetic and IV fluids as appropriate
Hypotension/shockIV crystalloid, then vasopressor support if refractory
Pulmonary edema/respiratory failureOxygen, ventilatory support, ICU care
Skin burning/paresthesiaWash thoroughly; symptomatic topical care and analgesia if needed

Atropine: use cautiously

Atropine is not an antidote for cypermethrin. It may occasionally be used by clinicians for problematic excessive bronchial secretions, but pyrethroid poisoning is frequently mistaken for organophosphate poisoning. Inappropriate atropine can cause serious toxicity. Look for genuine organophosphate features or a known mixed product:
  • Miosis
  • Profuse bronchorrhea and bradycardia
  • Marked cholinergic secretions
  • Low cholinesterase activity, where available
Many pesticide formulations are mixtures, and hydrocarbon solvents can themselves cause aspiration pneumonitis. Take the container/label to hospital. Rosen's notes that pyrethroid poisoning has no known antidote and no role for enhanced elimination. ROSEN's Emergency Medicine Concepts and Clinical Practice, p. 3028.

Investigations and observation

For significant ingestion or symptoms:
  • ECG and continuous cardiorespiratory monitoring
  • Blood glucose, electrolytes, renal and liver function
  • ABG/VBG and chest imaging if respiratory symptoms, aspiration, or pulmonary edema is suspected
  • Consider plasma cholinesterase if organophosphate co-exposure is possible
  • Observe asymptomatic minor exposures after poison-center advice. Admit patients with seizures, altered sensorium, bronchospasm, hypoxia, arrhythmia, persistent vomiting, or deliberate large ingestion.

Urgent referral

Go to an emergency department immediately if the person swallowed the product, or has breathing difficulty, wheeze, persistent vomiting, drowsiness, confusion, seizures, severe tremor, chest symptoms, or significant eye exposure.
In the US, call Poison Control at 1-800-222-1222. Elsewhere, contact the local poison information center or emergency service. Poison Control's exposure first aid includes fresh air after inhalation, washing skin with soap and water, and 15-minute eye irrigation. Poison Control guidance
Recent systematic-review evidence does not provide a new specific antidote for acute human cypermethrin poisoning. The key management remains supportive; a recent review on cardiac effects is mainly preclinical evidence (PMID: 41850513).
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