yellow2 → orange2 → red2 → brown2 → yellow2
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Mebroqualone
Mebroqualone (MBQ) is a quinazolinone depressant and an analogue of mecloqualone, from which it differs by carrying a bromine atom rather than a chlorine on the 3-phenyl ring. Originally synthesized in the 1960s, it produces sedative and hypnotic effects through GABAergic activity. It is shorter-acting and more potent than methaqualone, is considered habit-forming, and appears to have circulated as a black market designer drug in Germany.
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Threshold3-5 mg
Light5-8 mg
Moderate8-15 mg
Strong15-20 mg
Heavy20+ mg
Duration
After Effects1-4 hours
Subjective Effects
Legacy content. A statistically backed ontology from Mindstate Design Labs is coming soon.
The experience is dominated by sedation and hypnotic effects, accompanied by anxiety relief and muscle relaxation. It is described as shorter in duration and more potent than methaqualone. Memory disturbance and impaired coordination are also reported.
Physical
Sedation, hypnotic effects, muscle relaxation, and disturbed motor coordination make up the physical profile.
Sedation
Cognitive
Anxiety is reduced, and amnesia is reported as a characteristic effect.
Pharmacology
Pharmacodynamics
Mebroqualone is a quinazolinone-class GABAergic that produces sedative and hypnotic effects through agonist activity at the β subtype of the GABAa receptor. It is an analogue of mecloqualone, differing by the substitution of a bromine atom for a chlorine on the 3-phenyl ring, and shares similar sedative and hypnotic properties with that parent compound. It has also been described as a shorter-acting and more potent analogue of methaqualone.
Pharmacokinetics
Absorption & half-lifenot documented yetMetabolitesnone documented yet
Interactions
Interactions not written up yet
An unlisted combination is an unknown one, not a safe one. Check a dedicated combination chart before mixing.
Tolerance
Tolerance not written up yet
Harm Potential
Harm Potential not written up yet
History & Culture
Mebroqualone was originally synthesized in the 1960s as an analogue of mecloqualone, from which it differs by the substitution of a bromine atom for a chlorine on the 3-phenyl ring. Little documentation of the compound exists beyond its initial synthesis.…
Legality
Legality not written up yet
Article Status
Step 1 · Automated synthesisAn autonomous workflow built by Josie Kins compiled this article's foundation from information published across the web.
- Step 2 · First-pass reviewPending
Not yet reviewed — this article is pending editorial review by Lyrea.
- 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 changes7 human edits · latest
Times are UTCNewest first
24 January 2026
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
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