Calder, Abigail Diehl, Vincent Hasler, Gregor 2025 Psychedelic experiences involving extreme feelings of horror, helplessness, and perceived threats can be traumatizing. Traumatic psychedelic experiences are a rare, extreme, and largely preventable form of challenging experience which can arise due to frightening psychedelic drug effects, unsafe settings, and emergence of pre-existing trauma. Some people recover quickly, but others develop prolonged anxiety, sleep disturbances, derealization, or other potentially trauma-related symptoms. This chapter discusses the causes, phenomenology, and potential outcomes of traumatic psychedelic experiences, as well as how to prevent them and minimize their negative impact. application/pdf https://folia.unifr.ch/global/documents/331722 https://folia.unifr.ch/documents/331722/files/phr_calder_traumatic_psychedelic_experiences_published.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1007/7854_2025_579 info:eu-repo/semantics/altIdentifier/issn/1866-3370 info:eu-repo/semantics/openAccess License undefined Current Topics in Behavioral Neurosciences. - : Springer Berlin Heidelberg. - 2025 Acute stress disorder Adverse effects Post-traumatic growth Posttraumatic stress disorder Post-trip difficulties Trauma-related symptoms Traumatic psychedelic experiences Traumatic Psychedelic Experiences http://purl.org/coar/resource_type/c_3248