The Psychedelic Experience: A Manual Based on The Tibetan Book of the Dead (commonly referred to as The Psychedelic Experience) is an instruction manual intended for use during sessions involving psychedelic drugs. Started as early as 1962 in Zihuatanejo, the book was finally published in August 1964. This version of Tibetan Book of the Dead was authored by Timothy Leary, Ralph Metzner and Richard Alpert, all of whom took part in experiments investigating the therapeutic and religious possibilities of drugs such as mescaline, psilocybin and LSD.