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Effect Index

Effect Index, 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.

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Substance Summaries

Hallucinogenic substance classes, broken down and described

For more, see the articles section.

Featured Effects

A selection of subjective effects that best represent the SEI

For more, see the Subjective Effect Index.

Featured Article

Analyses that go beyond individual subjective effects

Psychedelic Intensity Scale

Wednesday, April 21 2021 · 9 min read

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 Replications

Artistic representations of specific subjective effects

DMT Tunnel

A replication of Geometry

by Hypnagogist

For more, see the replications gallery.

Featured Reports

Recommended firsthand accounts of hallucinogenic experiences

Ayahuasca

2.5g Syrian Rue / 6g Mimosa hostilis rootbark Oral

4-HO-MET

100mg Oral

Ayahuasca

2.5g Syrian Rue / 6g Mimosa hostillis Oral

Nightmares in Eiriel

by Sedric Lightbury

DPH

2000mg Oral

St. Elmo's Fire

by nervewing

MXPr

60mg Intranasal

Surrender

by Kaytwo

Combination

The Expedition

by nervewing

MXE

50mg Intranasal

Ayahuasca

2g Syrian Rue / 1g Mimosa Hostillis Oral

For more, see the reports section.