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A benzodiazepine related to clonazepam discovered by Hoffman-LaRoche in the 1960s. Potentially useful in treating schistosomiasis. Has been sold on the grey market as a recreational drug but has not seen widespread popularity.

Oral

Route dataTripSit

ThresholdLightCommonStrongHeavy
3–6 mg6 mg+
07.5 mg
LightCommonStrongHeavy
Onset20–60 minutes
Total9–15 hours
After-effects1–6 hours
OnsetCome-upPeakOffset
Plan when to take Meclonazepam — see where onset, peak and comedown land on the clock

Source: TripSit — Meclonazepam ↗

Fact-sheets from PsychonautWiki. Harm-reduction reference only — not medical advice.