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A very long acting, potent and subtle benzodiazepine. Infamous for the calamitous experiences it tends to produce in people dosing unknown amounts. Prescribed in certain countries for epilepsy and alcohol withdrawal.

Oral

Route dataTripSit

ThresholdLightCommonStrongHeavy
0.5–1 mg1–2 mg2 mg+
02.5 mg
LightCommonStrongHeavy
Onset15–60 minutes
Total18 hours
After-effects36 hours
OnsetCome-upPeakOffset
Plan when to take Phenazepam — see where onset, peak and comedown land on the clock

Source: TripSit — Phenazepam ↗

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