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Alprazolam

Alprazolam molecule structureAlprazolam molecule structure
8-Chloro-1-methyl-6-phenyl-4H-[1,2,4]triazolo[4,3-a][1,4]benzodiazepine
Xanax, Xannies, Zannies, Bars, Xanbars

Alprazolam is a fast-acting depressant of the triazolobenzodiazepine class.citation needed Developed by Jackson Hester Jr. at the Upjohn Company, it was patented in 1971 and approved for medical use in the United States in 1981. It is widely prescribed for the management of anxiety and panic disorders1 and remains one of the most commonly prescribed medications in the U.S. Regular or excessive use can lead to physical dependence and addiction.2

Dosage & Duration

Dosage

Doses are population estimates that vary widely between individuals.

Threshold~0.25 mg
Light0.25-0.5 mg
Moderate0.5-1.5 mg
Strong1.5-2 mg
Heavy2+ mg
Bioavailability
84-91%

Duration

Onset20-40 minutes
Come Up1-2 hours
Peak2-4 hours
Offset2-6 hours
After Effects6-24 hours
Total5-8 hours
Half-life
9-16 hours

Subjective Effects

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

Effects vary widely by individual, dose, and context.

Physical

The physical effects of alprazolam can be broken down into several components which progressively intensify proportional to dosage.

Cognitive

The cognitive effects of alprazolam can be broken down into several components which progressively intensify proportional to dosage. The general head space of alprazolam is described by many as one of intense sedation, relaxation, anxiety suppression and decreased inhibition. It contains a large number of typical depressant cognitive effects. Paradoxical reactions to benzodiazepines such as increased seizures (in epileptics), aggression, increased anxiety, violent behavior, loss of impulse control, irritability and suicidal behavior sometimes occur (although they are rare in the general population, with an incidence rate below 1%). These paradoxical effects occur with greater frequency in recreational abusers, individuals with mental disorders, children, and patients on high-dosage regimes.

Forked from Subjective Effect Documentation byJosie Kins September 2015.

Reagent Testing

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

Morr(MO)
pink2 → green1
Zimm(ZI)
white → blue1 → blue1 → blue2
Marquis(MQ)
No reaction
No reaction
Mecke(ME)
No reaction
No reaction
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Pharmacology

Pharmacodynamics

Alprazolam acts as a positive allosteric modulator at GABA-A receptors, binding nonselectively to the benzodiazepine site on the receptor complex.citation needed This enhances the effects of GABA, the brain's primary inhibitory neurotransmitter, by increasing chloride ion conductance through the receptor channel, hyperpolarizing neurons and reducing their excitability. The drug affects receptor complexes containing α1 subunits (associated with sedation and amnesia) and α2 subunits (associated with anxiolysis). Alprazolam also acts as an agonist at the translocator protein and suppresses hypothalamic-pituitary-adrenal axis activity. Compared to some other benzodiazepines, alprazolam administration increases extracellular dopamine concentrations in the striatum.

Pharmacokinetics

Alprazolam is rapidly absorbed orally with high bioavailability1 and readily crosses the blood-brain barrier. It is primarily metabolized in the liver via CYP3A4,2 with minor contributions from CYP3A5, CYP3A7, and CYP2C9. Hydroxylation produces at least 29 metabolites, primarily 4-hydroxyalprazolam and α-hydroxyalprazolam,citation needed though these are present at low concentrations with reduced receptor affinity and contribute minimally to the drug's effects. The majority of the dose is eliminated in the urine, largely as unmetabolized alprazolam.

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.

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 sedative-hypnotic effects can emerge quickly, often after only several days of uninterrupted use. Tolerance to cognitive impairment and sedation appears to develop over 1-3 weeks of daily administration, with some research indicating that impairment on most tests resolves by this timeframe. Receptor studies have demonstrated reduced GABA-A benzodiazepine receptor density after approximately 24 days of regular use at therapeutic doses.
Cross Tolerance

Benzodiazepines (all members of the class)

Baseline Reset
Following cessation, tolerance typically returns to baseline within 7-14 days. However, individuals with prolonged or intensive use patterns may require significantly longer periods for complete tolerance reset, proportional to the duration and intensity of their prior use.

Harm Potential

Addiction & Dependence

Psychological

High

Alprazolam is considered highly psychologically addictive with significant abuse potential.3 Its high binding affinity, high potency, and rapid onset increase abuse liability.citation needed Compulsive redosing is commonly reported among users seeking a 'high', which frequently leads to blackout states and impaired judgment.

Physical

Extremely High

Physical dependence develops reliably with regular use, particularly at doses above 4 mg daily or with use exceeding six months.citation needed Withdrawal is potentially life-threatening and can include tremors, seizures, marked delirium, and in rare cases coma or death. Medical supervision and gradual tapering over weeks or months is essential; abrupt discontinuation is extremely dangerous.

Toxicity

Central Nervous System

Misuse of alprazolam has been shown to cause cognitive impairment including memory deficits; occasional use at therapeutic doses does not appear to cause lasting neurological damage.citation needed

Vascular/Muscular

Injection of oral alprazolam preparations has caused dangerous damage to blood vessels, embolization, and rhabdomyolysis; this risk is specific to injection misuse and does not apply to oral administration.

Respiratory

Respiratory depression can occur at high doses or in overdose, particularly when combined with other depressants; patients with pre-existing respiratory impairment are at increased risk.citation needed

Psychosis Risk

Hallucinations are rare during alprazolam use. Paradoxical reactions including mania, agitation, and rage occur with an incidence below 1% in the general population but are more frequent in recreational abusers, individuals with mental disorders, children, and patients on high-dose regimens.citation needed Delirium and hallucinations may also occur during withdrawal.

Seizure Risk

Alprazolam itself has anticonvulsant properties during use. However, abrupt discontinuation after regular use carries significant seizure risk that can be life-threatening.citation needed Paradoxical increased seizure activity has been reported in epileptics. Gradual dose tapering over weeks is essential to minimize withdrawal seizure risk.

History & Culture

Discovery and Development

Alprazolam was first synthesized in 1971 by J.B. Hester at the Upjohn Company, a pharmaceutical manufacturer that would later become part of Pfizer.4 The compound was developed as a triazolobenzodiazepine, featuring a triazole ring fused to the core benzodiazepine

Legality

International

UN Convention on Psychotropic Substances 1971: Schedule IV.

1961 Convention: not internationally scheduled.

1988 Convention: not internationally scheduled.

By Country

Prescription30
United States flagUnited StatesPrescription only
Argentina flagArgentinaPrescription only
Australia flagAustraliaPrescription only
Austria flagAustriaPrescription only
Belgium flagBelgiumPrescription only
Brazil flagBrazilPrescription only
Canada flagCanadaPrescription only
China flagChinaPrescription only
Czech Republic flagCzech RepublicPrescription only
Denmark flagDenmarkPrescription only
France flagFrancePrescription only
Germany flagGermanyPrescription only
Ireland flagIrelandPrescription only
Italy flagItalyPrescription only
Japan flagJapanPrescription only
Mexico flagMexicoPrescription only
Netherlands flagNetherlandsPrescription only
New Zealand flagNew ZealandPrescription only
Philippines flagPhilippinesPrescription only
Poland flagPolandPrescription only
Portugal flagPortugalPrescription only
Russia flagRussiaPrescription only
Singapore flagSingaporePrescription only
South Africa flagSouth AfricaPrescription only
South Korea flagSouth KoreaPrescription only
Spain flagSpainPrescription only
Sweden flagSwedenPrescription only
Switzerland flagSwitzerlandPrescription only
Turkey flagTurkeyPrescription only
United Kingdom flagUnited KingdomPrescription only

References

Source Pages

  1. Drug Users Bible by Dominic Milton Trott
  2. DrugBank
  3. DrugBank Article: Alprazolam clinical use
  4. DrugBank Article: Alprazolam pharmacology
  5. Erowid
  6. Isomer Design (TiHKAL/PiHKAL)
  7. PsychonautWiki
  8. The Drug Classroom
  9. TripSit Factsheets
  10. TripSit Wiki
  11. TripSit Wiki: Drug Combinations
  12. Wikipedia

Citations

  1. Tobin T. George, & Jayson Tripp. (2023-04-24). Alprazolam. StatPearls [Internet]. https://www.ncbi.nlm.nih.gov/books/NBK538165/12
  2. XANAX- alprazolam tablet. DailyMed (n.d.). https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=388e249d-b9b6-44c3-9f8f-880eced0239f1234567
  3. Nassima Ait-Daoud, Allan Scott Hamby, Sana Sharma, & Derek Blevins. (2018). A Review of Alprazolam Use, Misuse, and Withdrawal. Journal of Addiction Medicine, 12(1), 4–10. https://doi.org/10.1097/adm.00000000000003501
  4. Alprazolam. Britannica (n.d.). https://www.britannica.com/science/alprazolam1
  5. Resolution 518/1985, Annex I. servicios.infoleg.gob.ar (n.d.). https://servicios.infoleg.gob.ar/infolegInternet/anexos/85000-89999/87899/norma.htm1
  6. Resolution 518/1985, Annex I. servicios.infoleg.gob.ar (n.d.). https://servicios.infoleg.gob.ar/infolegInternet/anexos/20000-24999/20966/norma.htm1
  7. Therapeutic Goods (Poisons Standard—February 2025) Instrument 2025. legislation.gov.au (n.d.). https://www.legislation.gov.au/F2025L00049/latest/text1
  8. Alprazolam: Review of PBS utilisation following rescheduling to Schedule 8. Pharmaceutical Benefits Scheme (2015). https://www.pbs.gov.au/pbs/industry/listing/participants/public-release-docs/2015-10/alprazolam-dusc-prd-2015-10-abstract1
  9. Rezeptpflichtverordnung. ris.bka.gv.at (n.d.). https://www.ris.bka.gv.at/NormDokument.wxe?Abfrage=Bundesnormen&Anlage=1&Artikel=&Gesetzesnummer=10010358&Paragraf=&Uebergangsrecht=1
  10. Rezeptpflichtverordnung. ris.bka.gv.at (n.d.). https://www.ris.bka.gv.at/GeltendeFassung.wxe?Abfrage=Bundesnormen&Gesetzesnummer=100110541

Article Status

  • Josie Kins avatar
    Step 1 · Automated synthesis

    An autonomous workflow built by Josie Kins compiled this article's foundation from information published across the web.

  • Lyrea avatar
    Step 2 · First-pass review

    A first pass manual review and edit of article prose and copy has been performed by subject-matter expert Lyrea. This does not guarantee factual accuracy. An additional human review for each of this article's citations is yet to be performed.

  • Step 3 · Citation reviewPending

    No one has reviewed this article's citations yet. That second pass checks each claim against the source it cites.

Recent changes8 human edits · latest

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18 August 2026

  1. Lyrea · Changed a word in Dosage & DurationRoutes 2 › Stages › After effects

  2. Lyrea · Changed a word in Dosage & DurationRoutes 2 › Stages › Total duration

  3. Lyrea · Reworded 5 words in Dosage & DurationRoutes 2 › Notes

  4. Lyrea · Reworded 18 words in Dosage & DurationRoutes 2 › Notes

  5. Lyrea · Reworded 2 words in Dosage & DurationRoutes 2 › Notes

  6. Lyrea · Reworded 5 words in Dosage & DurationRoutes 2 › Notes

  7. Lyrea · Reworded 2 words in Dosage & DurationRoutes 1 › Stages › Come up

25 March 2026

  1. Lyrea · Updated the article · also 2C-B, DOM, MDMA

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