Clonazolam Facts
Depressant;
Description
Clonazolam is a synthetic depressant of the triazolobenzodiazepine class. It amplifies GABA, the brain's primary inhibitory signal, broadly suppressing nervous system activity and producing sedation, anxiety relief, and muscle relaxation.[1]
Subjective effects include sedation, muscle relaxation, anxiety suppression, disinhibition, and dense amnesia. The defining quality is a gap between how impaired a person feels and how impaired they actually are — a pervasive calm that masks severe cognitive and motor deficits.
Clonazolam produces rapid physical dependence, and respiratory depression — breathing slowing until it stops — is the primary lethal mechanism.[2] The short half-life accelerates tolerance and interdose withdrawal; combining it with opioids dramatically amplifies respiratory depression and has been documented in multiple fatalities.
Dose and durationby route · individual sensitivity varies
Starts in 20 – 60 minLasts 6 – 10 hoursAfter-effects 6 – 24 hours
Body and dependence
- Acute toxicity
- High
- Chronic toxicity
- Moderate
- Physical dependence
- High
- Psychological dependence
- High
- Withdrawal
- Life-threatening · fatal · medical supervision
- Compulsive redosing
- High
Tolerance
- Builds
- Rapid
- Fully resets after
- 10.5 days
- Carries over to
- benzodiazepines;
Z-drugs (zolpidem, zopiclone, zaleplon); barbiturates; alcohol
Effectslikely at a common dose
- Perception
- none likely · 6 possible, including Spatial disorientation, Visual acuity suppression, Vestibular distortion
- Body
- Sedation;
Muscle relaxation; +11 possible, including Motor control impairment, Dizziness, Nystagmus (eye wobbles) - Thinking
- Cognitive impairment;
+17 possible, including Memory suppression, Decision impairment, Analysis suppression - Feeling
- Anxiety suppression;
+3 possible - Self
- none likely · 6 possible, including Craving, Communication suppression
- Time
- none likely · 2 possible, including Temporal disorientation
Who shouldn't take it
Combinations60 recorded
Seek help immediately if
- Extreme drowsiness — can't stay awake or be roused
- Confusion, slurred speech, severe loss of coordination
- Slow, shallow, or irregular breathing
- Unconsciousness / unresponsive; limp, floppy body
- Blue lips or fingertips
- Vomiting while sedated (choking / aspiration risk)
- Cold, clammy skin; weak pulse
What to do
- Try to wake them — shout, firm sternal rub
- If unresponsive or breathing is impaired, call emergency services
- Place them in the recovery position — critical, they can choke on vomit
- Monitor breathing continuously; be ready to give rescue breaths / CPR
- Never leave them alone to "sleep it off"
- Do not give other drugs, stimulants, or more depressants
Most depressant overdoses resolve with airway protection, breathing support, and monitoring. The danger is respiratory depression and choking on vomit — sharply worse when combined with opioids or alcohol. GHB/GBL overdoses often involve sudden deep unconsciousness and may self-resolve, but airway protection is essential.
988 Suicide & Crisis LifelineFireside Project: 62-FIRESIDE
References
- [1]^Moosmann B, Auwärter V (2018) Designer Benzodiazepines: Another Class of New Psychoactive Substances. — Handbook of Experimental Pharmacology doi:10.1007/164_2018_154
- [2]^Moore C, Hammers J, Marshall P (2022) Clonazolam Intoxication Case Report: Danger of Designer Benzodiazepines. — The American Journal of Forensic Medicine and Pathology doi:10.1097/paf.0000000000000803