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Entity
Mephenaqualone
PSX-0244
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Common namesMephenaqualone
PsychoactiveDepressant
+1 more
SedativeChemicalQuinazolinone
PharmacologicalGABA-A receptor positive allosteric modulator
Threshold
< 0.5 mg
Light
0.5 – 1.5 mg
Common
1.5 – 2.5 mg
Strong
2.5 – 4 mg
Heavy
4+ mg
Onset
30 – 40 min
Come up
5 – 10 min
Peak
2 – 4 hours
Offset
10 – 15 hours
After effects
6 – 12 hours
Total:15 – 20 hours
minlowmodhigh
Acute
Chronic
Physical
Psych.
Withdrawalnot assessed
Buildupwithin a few days of repeated administration
Cross-tol.GABA|gabaergic, depressants
Dosage varies by body weight, tolerance & metabolism · Not medical advice · Terms
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Effects (6)
Dependence
highly addictive
experience reports
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First-person accounts of subjective effects, timing, and outcomes — submitted for harm reduction.
Last updated Mar 17, 2026Report an issue