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Also known as ethylnaphthidate

Most likely a TRI, such as HDMP-28, short history of human use.

Insufflated

Route dataTripSit

ThresholdLightCommonStrongHeavy
5–15 mg15–35 mg35–60 mg—+
060 mg
LightCommonStrongHeavy
Onset1–15 minutes
Total2–5 hours
After-effects1–8 hours
OnsetCome-upPeakOffset

Oral

Route dataTripSit

ThresholdLightCommonStrongHeavy
15–30 mg30–50 mg50–100 mg—+
0100 mg
LightCommonStrongHeavy
Onset1–15 minutes
Total2–5 hours
After-effects1–8 hours
OnsetCome-upPeakOffset
Plan when to take HDEP-28 — see where onset, peak and comedown land on the clock

Source: TripSit — HDEP-28 ↗

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