Flunitrazolam Facts
Depressant;
Description
Flunitrazolam is a synthetic depressant of the triazolobenzodiazepine class. It amplifies GABA, the brain's primary calming signal, producing deep sedation and the other hallmark effects of the class.[1][2]
Subjective effects include heavy sedation, anterograde amnesia — inability to form new memories — anxiety relief, muscle relaxation, and disinhibition. The experience is defined by an unusually deep amnesia that outstrips the sedation: a person may remain mobile and conversational while forming no memories of what they are doing.
Flunitrazolam carries high abuse liability, and no lethal dose has been established for the compound in any species.safety citation needed Combining it with opioids or alcohol dramatically amplifies respiratory depression — a pattern documented in clinical poisoning cases.[3]
Dose and durationby route · individual sensitivity varies
Starts in 20 – 40 minLasts 4 – 8 hoursAfter-effects 1 – 12 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;
zolpidem; zopiclone; alcohol; barbiturates
Effectslikely at a common dose
- Perception
- none likely · 7 possible, including Spatial disorientation, Vestibular distortion, Visual acuity suppression
- Body
- Sedation;
Motor control impairment; Muscle relaxation; Bodily heaviness; Physical fatigue; +8 possible, including Dizziness, Insomnia, Nystagmus (eye wobbles) - Thinking
- Analysis suppression;
Information processing suppression; Cognitive fatigue; Cognitive impairment; Decision impairment; Focus suppression; Memory suppression; +11 possible, including Thought disorganization, Delusions of sobriety, Confusion - Feeling
- Anxiety suppression;
+6 possible, including Empathy suppression, Depression, Dysphoria - Self
- none likely · 11 possible, including Communication suppression, Craving, Depersonalization
- 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]^Manchester KR, Lomas EC, Waters L, Dempsey FC, Maskell PD (2018) The emergence of new psychoactive substance (NPS) benzodiazepines: A review. — Drug testing and analysis doi:10.1002/dta.2211
- [2]^Navarrete F, Marín-Mayor M, Martínez-Hostyn L, Rubio G, Manzanares J (2026) Benzodiazepine Dependence: Clinical and Molecular Aspects, Preventive Strategies and Therapeutic Approaches. — International journal of molecular sciences doi:10.3390/ijms27031430
- [3]^Helander A, Bäckberg M, Signell P, Beck O (2017) Intoxications involving acrylfentanyl and other novel designer fentanyls – results from the Swedish STRIDA project — Clinical Toxicology doi:10.1080/15563650.2017.1303141