Key Takeaways

From the Authors As published in the article
  1. Hallucinogen-related hospital admissions are associated with elevated rates of subsequent psychosis diagnoses, but these associations are largely explained by preexisting psychiatric conditions among those with hallucinogen-related admissions.
  2. In the evaluation of patients with hallucinogen exposure and psychosis, comprehensive psychiatric assessment should include evaluation of baseline psychiatric comorbidities that may predispose individuals to both hallucinogen use and psychosis.
  3. Population-level associations between hallucinogen use and psychosis may reflect underlying psychiatric vulnerability and co-occurring substance use disorders rather than hallucinogen-specific causation, informing both clinical assessment and policy discussions.
Extended Takeaways
  1. In this claims cohort, baseline psychotic disorders were far more common before a hallucinogen-related admission than before other substance-related admissions (19.2% vs 6.3%), suggesting that outpatient psychosis history can materially change how postexposure risk is interpreted.
  2. The crude postadmission signal was substantial—16.4% vs 6.6% had ≥1 psychosis diagnosis and 9.3% vs 3.3% had ≥1 psychosis admission between 30 days and 6 months—but the association with psychosis diagnosis was no longer significant after full adjustment (HR=0.97 [0.95–1.00]).
  3. Baseline vulnerability markers outperformed hallucinogen exposure in adjusted models: baseline psychotic admissions showed HRs ranging from 1.28 to 1.35, stimulant use disorders HRs ranging from 1.27 to 1.32, and opioid use disorder HRs ranging from 1.28 to 1.32.
  4. Only 695/6,184 individuals with ≥1 hallucinogen-related admission had no other nonhallucinogen substance-related admission during enrollment, so clinicians should expect polysubstance use to be the rule rather than the exception when assessing acute psychosis risk in this population.
  5. The median age for hallucinogen-related admissions was 24 years [IQR=16], overlapping the usual age of onset for schizophrenia spectrum disorders; this makes prodromal illness a practical alternative explanation when psychosis emerges after hallucinogen-related care.
  6. Excluding people with prior psychosis admissions alone may miss many high-risk patients, because psychosis-related admissions represented only a subset of those with baseline psychotic disorders (10,719/18,131 people); outpatient diagnostic history added meaningful confounder control.
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Physicians Postgraduate Press, Inc. (PPP) makes no warranties about the accuracy or completeness of any information published in The Journal of Clinical Psychiatry or other PPP materials, and disclaims liability for any use or non-use of that information. Clinicians should not rely solely on these materials and should exercise their own professional judgment when making patient care decisions on an individualized basis.

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