A review of psychosis linked to classic psychedelics and how it compares to primary psychosis

The question

How do psychotic symptoms that follow the use of classic psychedelics compare with psychosis that arises on its own, and how might they be treated?

What they did

The authors wrote a review chapter, not a new study. They examined the history of using psychedelics such as LSD, psilocybin and mescaline as a research ‘model’ for schizophrenia, and compared the features of psychedelic-related psychotic symptoms with those of primary psychosis (psychosis not caused by a drug). They also outlined a psychodynamic therapy approach, a talk-therapy method developed for schizophrenia-spectrum conditions, that might be adapted for people experiencing these symptoms.

What they found

The authors describe psychotic symptoms as uncommon and non-specific side effects of classic psychedelics. They can appear during the acute drug effect, carry on into the ‘afterglow’ period in the days after, or, rarely, develop into long-term psychotic illness. The authors argue the ‘model psychosis’ idea has been widely criticized: acute drug effects may look similar on the surface, but the causes and psychological background of primary psychosis only partly apply. They also note it is unclear whether psychosis after classic psychedelics differs meaningfully from that linked to stimulants or cannabis. Their conclusion is that the further in time symptoms persist beyond the original psychedelic experience, the more they become indistinguishable from primary psychosis.

The fine print

This is a review and commentary, so it reports no new participants, no rates and no outcome numbers. The abstract gives no information on how the literature was searched or selected, so the conclusions reflect the authors’ interpretation. The proposed therapy approach is described as a possible adaptation, not as something tested in a trial. This summary is based on the abstract only.

What it means

Psychotic reactions to classic psychedelics appear to be rare but real, and the authors argue that when such symptoms persist over time they look much like psychosis from other causes.

Evidence grade: Very low. This is a narrative review chapter that summarizes clinical concepts and existing literature rather than reporting new data or pooled results.

This summary is based on the study’s published abstract.