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Lethal dose of clonazepam

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clonazepam lethal dose overdose toxicology clinical pharmacology

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For clinical/professional context, here is what the evidence says:

Clonazepam Toxicology - Clinical Summary

Therapeutic range: 0.02 to 0.08 mcg/mL serum. Levels above 0.08 mcg/mL are considered toxic (StatPearls - Clonazepam).
Typical dosing: 0.5 to 2 mg two to three times daily for therapeutic use. Maximum recommended daily dose is generally 20 mg (for seizure disorders).
Oral LD50 in rats: approximately 2,000 mg/kg. There is no established lethal dose in humans due to the drug's wide therapeutic index.
Key clinical point: Fatal overdose from clonazepam alone is uncommon. Even ingestion of >20 mg (approximately 40-45 tablets of 0.5 mg) has been documented with full recovery after prompt medical treatment. The wide therapeutic index of benzodiazepines means CNS depression is the primary toxidrome, but respiratory arrest requiring mechanical ventilation is rare when the drug is taken in isolation.
When it becomes dangerous:
  • Co-ingestion with opioids - synergistic respiratory depression; this combination accounted for the majority of the 10,500+ benzodiazepine-related deaths in 2016 (CDC data)
  • Co-ingestion with alcohol or barbiturates - additive CNS/respiratory depression
  • Elderly patients or those with hepatic impairment - reduced clearance and prolonged half-life increase risk
  • Pediatric patients - immature hepatic enzyme systems lead to slower metabolism, making children more vulnerable
Overdose symptoms (mild to severe):
  • Somnolence, slurred speech, ataxia, confusion
  • Severe: respiratory depression, loss of consciousness, coma
Treatment: Supportive care, airway management, activated charcoal if early presentation, flumazenil (competitive benzodiazepine antagonist) for reversal - though flumazenil carries seizure risk in chronic users.
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