Effect Index, which is currently under construction, is a resource dedicated to establishing the field of formalised subjective effect documentation. It is the home of the Subjective Effect Index (SEI), which contains 233 effect descriptions that exist to serve as a comprehensive map of all potential experiences that can occur under the influence of any class of psychoactive compound, particularly hallucinogens.

read more
About Us

Thank you Emergence Benefactors!

Emergence Benefactors logo
Thank you to our wonderful sponsor, Emergence Benefactors

Substance Summaries

Hallucinogenic substance classes, broken down and described
For more, see the articles section.

Featured Article

Analyses that go beyond individual subjective effects

Inspired by the Shulgin Rating Scale, this article attempts to model the overall psychedelic experience as a systematic progression of seven levels.

For more, see the articles section.

Featured Reports

Recommended firsthand accounts of hallucinogenic experiences
3-HO-PCP
10 mg Intranasal
by Sedric Lightbury
DPH
2000mg Oral
by nervewing
Memantine
150 mg Oral
Combination
DiPT
70 mg oral
4-HO-MET
100mg Oral
Ayahuasca
2.5g Syrian Rue / 6g Mimosa hostillis Oral
4-HO-MET
60mg Oral
For more, see the reports section.