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Codeine is a weaker opioid used to treat mild to moderate pain and to relieve cough. In many countries it is available over the counter in combination with paracetamol, which can easily be extracted to retrieve near-pure codeine. For this reason, it is used widely as a recreational opioid. It is metabolised into morphine in the body at a rate of 5% mg for mg.

Oral

Route dataTripSit

ThresholdLightCommonStrongHeavy
50–100 mg100–150 mg150 mg+
0187.5 mg
LightCommonStrongHeavy
Onset30–45 minutes
Total3–6 hours
After-effects1–12 hours
OnsetCome-upPeakOffset
Plan when to take Codeine — see where onset, peak and comedown land on the clock

Source: TripSit — Codeine ↗

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