Question 1

What is the difference between psilocybin and mescaline?

Accepted Answer

Psilocybin is a tryptamine psychedelic from fungi, while mescaline is a phenethylamine psychedelic from cacti (peyote, San Pedro). Key differences include duration (psilocybin 4-6 hours vs mescaline 8-14 hours), chemical class, and subjective character. Mescaline tends to produce more body-aware, visually vivid, and 'earthy' experiences. Both have long histories of indigenous sacred use and excellent physiological safety profiles.

Question 2

Does psilocybin have cross-tolerance with mescaline?

Accepted Answer

Psilocybin and mescaline show partial cross-tolerance because both ultimately act on 5-HT2A serotonin receptors, despite being from different chemical classes (tryptamine vs phenethylamine). The cross-tolerance is less complete than between psilocybin and LSD. Waiting 10-14 days between use of either substance generally restores full sensitivity.