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Buprenorphine

SUBUTEX

Pronunciation: byoo-pre-NOR-feen

Buprenorphine ballicule: receptor binding, kinetics and half-life diagram
Mechanism of action: Buprenorphine ballicule
Buprenorphine SUBUTEX mascot mnemonic cartoon
Visual mnemonic: Buprenorphine mascot
“Bumper orphan’s Sub in Texas”
pinpoint pupils → opioid
SubuTEXAS flag
SUBmarine periscope on bumper car

What it isPartial mu agonist with high receptor affinity; opioid use disorder and chronic pain.

Why this oneOUD maintenance of choice: safer than methadone, office-prescribable, comparably effective at adequate doses.

What limits itThat same affinity precipitates withdrawal if given too early after a full agonist. Sublingual absorption; QT prolongation at higher doses.

Pearls

Buprenorphine molecular structure (skeletal formula)
Molecular structure: Buprenorphine

FDA-approved for

Off-label

Classes and tags

Clinical profile

Therapeutic safety burden3 / 4
Overdose danger3 / 4
Weight-gain liability1 / 4
Sedation liability2 / 4
QT / Torsades1 / 4
Direct muscarinic antagonism0 / 4
Embryofetal risk2 / 4

Legacy pregnancy categoryC

Defining liabilityRespiratory depression and dependence remain possible, especially with benzodiazepines, alcohol or other sedatives.

FDA label

NO BOXED WARNINGS

FDA dosingPopulationStartTargetMax
Opioid dependence — induction (mono product preferred for induction; buprenorphine/naloxone preferred for maintenance)AdultsDay 1: up to 8 mg SL QD (in 2–4 mg increments); Day 2: 16 mg SL QD16 mg SL QD; maintenance range 4–24 mg QD24 mg QD (higher doses not studied in RCTs)

Renal Undefined

Hepatic Severe impairment: consider halving starting and titration incremental doses; monitor for toxicity/overdose

NOT for use as an analgesic — deaths reported in opioid-naïve individuals given a 2 mg SL dose.

Instructions

Available strengths

Cautions

Adverse reactions

Pregnancy Limited data do not indicate increased risk of major malformations; neonatal opioid withdrawal syndrome expected with prolonged use; dose adjustment (often higher) may be needed during pregnancy.

Lactation Present in low levels in human milk (<1% of maternal dose); no adverse reactions shown in breastfed infants — monitor infant for drowsiness and breathing difficulty.

Cost

Buprenorphine (SUBUTEX)
What pharmacies pay · NADAC 9/30/26
Strength#/mogeneric $/moCostPlus
2 mgSL tab30 qd$8.30not offered
8 mgSL tab30 qd$17.14not offered

Other forms: Buprenorphine buccal film (BELBUCA) · Buprenorphine ER injection (SUBLOCADE) · Buprenorphine SC (weekly/monthly) (BRIXADI) · Buprenorphine patch (BUTRANS)

Available combined with: Buprenorphine/ naloxone (SUBOXONE)

Generic entry2018

Serotonicity

This drug is routinely called serotonergic. By Gillman’s human-effect criteria it does not raise serotonin in the synapse.

Opioid effects and respiratory/CNS-depressant interactions remain important, but this drug is not a clinically significant SRI by the Gillman framework.

Gillman’s four human testsA measurable SERT affinity that fails all four is not clinical serotonicity.

Non-elevating actionNone recorded

Evidence confidenceHigh

Background: what serotonicity is · what is and is not an SRI · what counts as a relevant MAOI.

Open Buprenorphine in the interactive console ↗

Memory aids: interaction avatars

Buprenorphine CYP3A4 substrate avatar mnemonic
CYP3A4 substrate

Open Buprenorphine in the interactive console ↗

Self-check