# Introduction –Psychedelic Science Needs Philosophy **Opening (not a real abstract):** This article is part of a symposium on Chris Letheby’s book “Philosophy of Psychedelics” (OUP 2021), edited by Chiara Caporuscio and Sascha Benjamin Fink. I highly recommend Philosophy of Psychedelics by Chris Letheby (2021) to both the public and academics who want to dig deeper into the modern therapeutic science of psychedelics. I have been conducting clinical research with psychedelics since 2004, including trials suggesting the efficacy of psilocybin for treating tobacco use disorder (Garcia-Romeu et al., 2014), major depressive disorder (Davis et al., 2020), and cancer-related distress (Griffiths et al., 2016). Many of these studies have examined relatively high doses of psychedelics in the context of the screening, preparation, monitoring, and follow-up discussion in the days following the **Authors:** [[Matthew W. Johnson]]