Ethocybin
Ethocybin also known as 4-phosphoryloxy-N,''N''-diethyltryptamine or as CEY-19, is a psychedelic drug of the tryptamine and 4-hydroxytryptamine families related to the psilocybin-containing mushroom alkaloid psilocybin. It is assumed to act as a prodrug of 4-HO-DET analogously to how psilocybin acts as a prodrug of psilocin. The drug was first described in the literature by Albert Hofmann and colleagues at Sandoz by 1963.Use and effects
Interactions
Pharmacology
Ethocybin may be dephosphorylated in vivo to 4-HO-DET, analogously to how psilocybin is metabolized to psilocin. This chemical reaction takes place under strongly acidic conditions or enzymatically by phosphatases in the body. 4-HO-DET acts as a partial agonist of the serotonin 5-HT2A receptor.Chemistry
Analogues
s of ethocybin include 4-HO-DET, 4-AcO-DET, psilocybin, psilocin, baeocystin, and aeruginascin, among others.History
and colleagues working at Sandoz were the first to synthesize and describe ethocybin along with 4-HO-DET, which shortly followed his discovery of psilocin and psilocybin. They first described the drug in a patent by 1963. Along with 4-HO-DET, ethocybin was one of the earliest structurally modified or synthetic psychedelic tryptamines to be developed.Society and culture
Legal status
Ethocybin is not an explicitly nor implicitly controlled substance in Canada as of 2025.Ethocybin is not an explicitly controlled substance in the United States. However, it could be considered a controlled substance under the Federal Analogue Act if intended for human consumption.Research
Ethocybin, under the code name CEY-19 and along with 4-HO-DET, has been studied in psychedelic-assisted psychotherapy.