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Triazolam

Triazolam molecule structureTriazolam molecule structure
Triazolam
Halcion, Apo-Triazo, Hypam, Trilam, Novodorm

Triazolam is a short-acting benzodiazepine of the triazolobenzodiazepine subclass,citation needed primarily used as a hypnotic agent for the short-term management of insomnia. It is distinguished by its notably brief half-life compared to many other benzodiazepines and does not produce active metabolites. At higher doses, it may induce significant amnesia and lowered inhibitions.1 Like all benzodiazepines, triazolam carries a risk of habit formation and dependence.1

Dosage & Duration

Dosage

Doses are population estimates that vary widely between individuals.

Threshold~0.125 mg
Light0.125-0.25 mg
Moderate0.25-0.5 mg
Strong0.5-0.75 mg
Heavy0.75+ mg
Bioavailability
44%

Duration

Onset10-20 minutes
Peak1-1.5 hours
After Effects1-6 hours
Half-life
1.5-5.5 hours

Subjective Effects

Legacy content. A statistically backed ontology from Mindstate Design Labs is coming soon.

The experience is dominated by rapid-onset, heavy sedation with a strong pull toward sleep, reflecting the compound's use as a short-acting hypnotic. Effects arrive quickly and resolve within a few hours, with little in the way of sensory alteration. At higher doses, lowered inhibitions and significant anterograde amnesia become prominent, and users may perform complex behaviors — particularly in combination with alcohol — that they later have no memory of.

Physical

Pronounced sedation, drowsiness, and muscle relaxation dominate the physical experience. At high doses, slurred speech and loss of motor coordination appear, progressing toward unconsciousness and respiratory depression in overdose.

Impairment

Sedation

Cognitive

The headspace is anxiolytic and mentally blunted, with anxiety relief and disinhibition preceding sleep. Memory formation becomes unreliable at moderate to high doses, and recall of events after ingestion is often partial or absent.

Suppressions

Reagent Testing

Expected colorimetric results for common reagent tests. Colors show reaction change over 1–2 minutes.

Zimm(ZI)
white → pink1 → purple2
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Pharmacology

Pharmacodynamics

Triazolam acts as a positive allosteric modulator of the GABA-A receptor at the benzodiazepine binding site,citation needed enhancing the inhibitory effects of GABA by increasing its affinity for the receptor. This promotes chloride ion conductance and neuronal hyperpolarization, reducing cellular excitability. Triazolam also interacts with the translocator protein (TSPO) as a modulator.

Pharmacokinetics

Triazolam is lipophilic and undergoes hepatic metabolism via oxidative pathways.citation needed Oral bioavailability is approximately 44%, while sublingual administration achieves approximately 53%.2 The drug and its metabolites are excreted primarily in the urine as conjugated glucuronides,1 with only small amounts of unmetabolized triazolam appearing in urine.1 The two primary metabolites account for roughly 80% of urinary excretion.1

Interactions

Dangerous

Highest risk

These combinations are considered extremely harmful and should always be avoided. Reactions to these drugs taken in combination are highly unpredictable and have a potential to cause death.

AlcoholGHB/GBLOpioidsTramadol

Unsafe

Avoid

There is considerable risk of physical harm when taking these combinations, they should be avoided where possible.

DiphenhydraminePCP

Caution

Use caution

These combinations are not usually physically harmful, but may produce undesirable effects, such as physical discomfort or overstimulation. Extreme use may cause physical health issues. Synergistic effects may be unpredictable. Care should be taken when choosing to use this combination.

DXMKetamineMXE
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Tolerance

Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.

Full Tolerance
Tolerance to the sedative and hypnotic effects of triazolam develops with repeated use, typically within days to weeks of continuous administration. As with other benzodiazepines, tolerance to different effects may develop at varying rates, with partial but incomplete tolerance reported for certain effects such as balance and coordination impairment.
Cross Tolerance

Benzodiazepines, Other GABAergic depressants

Harm Potential

Addiction & Dependence

Psychological

Moderate

Triazolam is classified as habit-forming and susceptible to misuse and abuse.citation needed Its rapid onset of action and short half-life contribute to its abuse potential, though its relative obscurity compared to other fast-acting benzodiazepines limits diversion for recreational use.

Physical

High

With long-term use, triazolam is associated with tolerance and physical dependence. Discontinuation may lead to withdrawal, ranging from uncomfortable symptoms to a severe syndrome with stomach cramps, vomiting, muscle cramps, sweating, tremor, and, rarely, convulsions. Rebound insomnia may occur even after short-term, single-dose therapy.

Toxicity

Central Nervous System

Long-term use of triazolam may cause cognitive impairment, anterograde amnesia, daytime sedation, and motor incoordination;citation needed residual hangover effects including psychomotor impairment may persist into the next day even after single doses.

Reproductive

Triazolam is FDA Pregnancy Category X and has the potential to cause birth defects when used during pregnancy.citation needed

Psychosis Risk

Triazolam was withdrawn in the United Kingdom due to risk of psychiatric adverse drug reactions, particularly at higher dose ranges.citation needed Delirium, confusion, and amnesia have been reported. Abnormal dreams or nightmares occur rarely.3

Seizure Risk

Seizures are listed as a potential symptom of overdose.3 Withdrawal from triazolam may cause convulsions in rare cases, particularly following abrupt discontinuation after prolonged use.3

History & Culture

Triazolam was patented in 19704 and subsequently entered the pharmaceutical market in the United States in 1982 under the brand name Halcion.5 The drug gained widespread clinical adoption, and by 2017 it ranked as the 289th most commonly…

Legality

International

UN Convention on Psychotropic Substances 1971 (Schedule IV)

By Country

Prescription1
United States flagUnited StatesPrescription only
Not scheduled1
United Kingdom flagUnited KingdomWithdrawn

References

Source Pages

  1. DrugBank
  2. Erowid: Triazolam Vault
  3. PsychonautWiki: Triazolam
  4. Wikipedia

Citations

  1. Halcion- triazolam tablet. DailyMed (10 December 2019). https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=a0da0dba-a56d-486b-a45b-e8a7cdfbeac612345
  2. Kroboth PD. (1995). Triazolam Pharmacokinetics After Intravenous, Oral, and Sublingual Administration. 15(4), 259-262. https://journals.lww.com/psychopharmacology/Abstract/1995/08000/Triazolam_Pharmacokinetics_After_Intravenous,.4.aspx1
  3. HALCION (triazolam tablets, USP CIV) Prescribing Information. Pharmacia & Upjohn Company (Pfizer) (September 2016). https://tsbde.texas.gov/78i8ljhbj/Triazolam-Label-Information-1.pdf123
  4. Halcion (Triazolam): Risks, Effects, and UK Legal Status. Detox Plus UK (n.d.). https://www.detoxplusuk.com/halcion/1
  5. Introduction - Halcion - NCBI Bookshelf. National Academies Press (US) (n.d.). https://www.ncbi.nlm.nih.gov/books/NBK233849/1
  6. Britain Bans Halcion and Related Drugs. Deseret News (2 October 1991). https://www.deseret.com/1991/10/2/18944105/britain-bans-halcion-and-related-drugs/1
  7. 21 CFR § 1308.14 — Schedule IV. ecfr.gov (n.d.). https://www.ecfr.gov/current/title-21/part-1308/section-1308.141
  8. HALCION (triazolam) tablets, for oral use, CIV — Prescribing Information. accessdata.fda.gov (n.d.). https://www.accessdata.fda.gov/drugsatfda_docs/label/2023/017892s057lbl.pdf1
  9. 21 CFR § 1308.14 — Schedule IV Controlled Substances. Code of Federal Regulations, Title 21 (n.d.). https://www.govinfo.gov/content/pkg/CFR-1996-title21-vol9/html/CFR-1996-title21-vol9-part1308.htm12

Further Reading

  1. Drugs.com: Triazolam Prescribing Information
  2. FDA: Halcion (Triazolam) Label
  3. Mayo Clinic: Triazolam
  4. NCBI LiverTox: Triazolam
  5. PMC: The effect of triazolam premedication on anxiety, sedation, and amnesia
  6. PubChem: Triazolam
  7. Roth et al. 1983: Pharmacology and hypnotic efficacy of triazolam

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Recent changes8 human edits · latest

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