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Buprenorphine

Buprenorphine molecule structureBuprenorphine molecule structure
17-(Cyclopropylmethyl)-4,5-epoxy-18,19-dihydro-3-hydroxy-6-methoxy-6,14-ethenomorphinan-7-methanol
Subutex, Suboxone, Buprenex, Temgesic, Bupe
Psychoactive Class
Chemical Class

Buprenorphine is a semisynthetic opioid of the morphinan class, first discovered in 1966 at Reckitt & Colman's research laboratories in England.citation needed It functions as a partial mu-opioid receptor agonist with high binding affinity but lower intrinsic activity than full agonists such as heroin or methadone.1 Used clinically for both pain management and opioid addiction treatment,2 its slow receptor dissociation produces an unusually long duration of action.3 Respiratory depression from overdose is considered less likely than with other opioids.citation needed

Dosage & Duration

Dosage

Doses are population estimates that vary widely between individuals.

Threshold~0.2 mg
Light0.2-0.4 mg
Moderate0.4-0.8 mg
Strong0.8-1.5 mg
Heavy1.5+ mg

The onset and duration of effects vary according to the amount administered. At lower doses, effects generally persist for 8 to 12 hours, whereas higher doses can extend the duration considerably, potentially lasting between 24 and 72 hours.

Duration

Onset30-60 minutes
Peak1-4 hours
Total8-72 hours

Subjective Effects

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

The buprenorphine experience is that of a classical opioid softened at the edges: pain relief, sedation, and a warm sense of contentedness are present, but its euphoric and sedative properties are notably less pronounced than those of full agonist opioids, a consequence of its partial agonism at the mu-opioid receptor. Mood effects can swing in either direction, with both euphoria and dysphoria reported. Its ceiling effect gives it a lower risk of respiratory depression than most opioids, contributing to its reputation as comparatively safe and its widespread use in substitution treatment.

Physical

The body experience is one of relaxation, drowsiness, and blunted pain, accompanied by the standard opioid side-effect profile of itching, constipation, constricted pupils, and nausea. Sweating, insomnia, dizziness, and headache may also occur, and chronic use can suppress libido and sexual function.

Sedation

Sedative and analgesic effects define the body experience, though both are milder than with full agonist opioids.

Uncomfortable

The typical opioid side-effect cluster occurs, though generally less pronounced than with other opioids.

Cognitive

The headspace centers on mood alteration rather than perceptual change — an elevated, contented emotional tone in most users, though dysphoric mood and irritability can occur instead. Memory impairment and general cognitive and psychomotor dulling are reported, particularly with ongoing use.

Emotional

Mood effects are the dominant cognitive component and are less intense than those of full agonist opioids.

Irritability

Suppressions

General cognitive and psychomotor impairment is reported alongside memory difficulties.

Reagent Testing

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

Marquis(MQ)
white → purple2
Froe(FR)
white → purple2
Liebermann(LB)
No reaction
No reaction
Scott(SC)
No reaction
No reaction
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Pharmacology

Pharmacodynamics

Buprenorphine acts as a partial agonist at the mu-opioid receptor with high binding affinity but lower intrinsic activity relative to full agonistscitation needed, producing a ceiling effect at higher doses where its effects plateau rather than continuing to increase5. It functions as an antagonist at both the kappa-opioid and delta-opioid receptors6. Buprenorphine also acts at the nociceptin (ORL-1) receptor, where it has been characterized as both a full agonist and a partial agonistcitation needed. Its slow dissociation from the mu-opioid receptor (approximately 166 minutes) contributes to its prolonged duration of action.

Pharmacokinetics

Buprenorphine is primarily metabolized in the liver via CYP3A4 and CYP3A5-mediated N-dealkylation to norbuprenorphinecitation needed. Both buprenorphine and norbuprenorphine undergo further glucuronidation to inactive metabolites (buprenorphine-3-glucuronide and norbuprenorphine-3-glucuronide). Bioavailability is very high following intravenous administration, lower by the sublingual or buccal route, and very low when taken orally3. The elimination half-life of sublingual buprenorphine has been measured at approximately 31 hours5.

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.

AlcoholBenzodiazepinesCocaineDXMGHB/GBLKetamineMXEPregabalinTramadol

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.

AmphetaminesMAOIsMephedroneNitrous oxidePCP
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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 many effects develops with prolonged and repeated use, though the rate varies for different effects. Notably, tolerance to constipation-inducing effects develops particularly slowly. Some evidence suggests that buprenorphine tolerance may not develop as readily with chronic use compared to full opioid agonists, possibly due to its lack of delta-opioid agonism.
Baseline Reset
1-2 weeks
Half Tolerance
3-7 days
Cross Tolerance

All other opioids

Harm Potential

Addiction & Dependence

Psychological

Moderate

Long-term buprenorphine use is moderately addictive, carries a high risk of abuse, and can cause psychological dependence in some users.citation needed Once addiction has developed, stopping suddenly may lead to cravings.

Physical

Moderate

With continued use, buprenorphine can cause opioid-type physical dependence, so stopping suddenly or tapering too quickly may produce withdrawal signs and symptoms.5 The withdrawal syndrome is typically milder than seen with full agonists and may be delayed in onset.5 Symptoms include body aches, diarrhea, nausea, anxiety, tremors, tachycardia, insomnia, sweating, and weakness.citation needed

Toxicity

Hepatic

Hepatotoxicity ranging from transient asymptomatic elevations in liver enzymes to rare cases of hepatic failure, hepatic necrosis, and hepatic encephalopathy has been observed;citation needed many cases involved pre-existing liver disease, viral hepatitis co-infection, concurrent hepatotoxic drugs, or ongoing injection drug use.7

Endocrine

Ongoing opioid use can affect hypothalamic-pituitary-gonadal signaling and result in androgen deficiency, which may appear as reduced libido, impotence, erectile dysfunction, amenorrhea, or infertility;citation needed adrenal insufficiency has also been reported, more often after use lasting longer than one month.8

Respiratory

Central sleep apnea has been reported as a side effect of long-term buprenorphine use, though it may resolve with dose reduction.citation needed

Cardiovascular

QT prolongation and orthostatic hypotension may occur with buprenorphine use.9

Seizure Risk

Among those with a history of seizures, a risk exists of further seizures.citation needed No notable seizure risk is documented in individuals without pre-existing seizure disorders.

History & Culture

Discovery and Early Development

Buprenorphine emerged from a decade-long research program at Reckitt & Colman (now Reckitt Benckiser) in Hull, England, where scientists sought to synthesize opioid compounds that retained therapeutic analgesic properties while minimizing the problematic effects of physical dependence and abuse

Legality

International

1961 Single Convention: buprenorphine is not scheduled.

1971 Convention on Psychotropic Substances: Schedule III.

1988 Convention: buprenorphine is not listed in precursor Tables I or II.

By Country

Controlled / restricted1
Croatia flagCroatiaRestricted
Prescription13
United States flagUnited StatesPrescription only
Austria flagAustriaPrescription only
Canada flagCanadaPrescription only
Finland flagFinlandPrescription only
France flagFrancePrescription medicine
Germany flagGermanyPrescription only
Netherlands flagNetherlandsPrescription only
Norway flagNorwayPrescription only
Russia flagRussiaPrescription only
Sweden flagSwedenPrescription only
Switzerland flagSwitzerlandPrescription only
Turkey flagTurkeyPrescription only
United Kingdom flagUnited KingdomPrescription only

References

Source Pages

  1. Erowid
  2. Erowid: Buprenorphine Vault
  3. Isomer Design (TiHKAL/PiHKAL)
  4. PsychonautWiki
  5. The Drug Classroom
  6. TripSit Factsheets
  7. TripSit Wiki
  8. Wikipedia

Citations

  1. Kumar R, Viswanath O, & Saadabadi A. (2024). Buprenorphine. StatPearls [Internet]. https://www.ncbi.nlm.nih.gov/books/NBK459126/1
  2. Buprenorphine Treatment for Opioid Use Disorder: An Overview. CNS Drugs (2019). https://pmc.ncbi.nlm.nih.gov/articles/PMC6585403/12
  3. Pande LJ, Arnet RE, & Piper BJ. (2023). An Examination of the Complex Pharmacological Properties of the Non-Selective Opioid Modulator Buprenorphine. 16(10), 1397. https://doi.org/10.3390/ph1610139712
  4. TripSit Drugs Database, buprenorphine record. raw.githubusercontent.com (n.d.). https://raw.githubusercontent.com/TripSit/drugs/master/drugs.json12
  5. Subutex (buprenorphine sublingual tablets), CIII Initial U.S. Approval: 1981. DailyMed (n.d.). https://dailymed.nlm.nih.gov/dailymed/archives/fdaDrugInfo.cfm?archiveid=6606961234
  6. Davis M. (2025). Buprenorphine Pharmacodynamics: A Bridge to Understanding Buprenorphine Clinical Benefits. 85(2), 215-230. https://pubmed.ncbi.nlm.nih.gov/39873915/1
  7. Buprenorphine – LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) / NCBI Bookshelf (n.d.). https://www.ncbi.nlm.nih.gov/books/NBK548871/1
  8. Buprenorphine Hydrochloride Injection – Full Prescribing Information. DailyMed (n.d.). https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=34767dda-ce52-4f98-a45f-bb5cee0cd5e6123
  9. SUBLOCADE (buprenorphine extended-release) injection – Full Prescribing Information. DailyMed (15 March 2023). https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=6189fb21-9432-45f8-8481-0bfaf3ccde95#sublocade-buprenorphine-er-injection1
  10. Christian Heidbreder, Paul J. Fudala, & Mark K. Greenwald. (2023). History of the discovery, development, and FDA-approval of buprenorphine medications for the treatment of opioid use disorder. Drug and Alcohol Dependence Reports. https://doi.org/10.1016/j.dadr.2023.1001331

Further Reading

  1. British Journal of Anaesthesia: Mechanisms of respiratory depression induced by buprenorphine and diazepam
  2. Drugs.com: Buprenorphine / Naloxone Interactions
  3. DrugWise: Buprenorphine
  4. PMC: Benzodiazepine use during buprenorphine treatment

Article Status

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