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Flashbacks, Hallucinogen Persisting Perception Disorder (HPPD), and Reactivations Following the Use of Classic
Marija Franka Žuljević1, Tomislav Majić2,3
1Department of Medical Humanities, University of Split School of Medicine, Split, Croatia.
Current Topics in Behavioral Neurosciences
|December 5, 2025
Summary
Classic psychedelic use can cause perceptual disturbances like flashbacks and Hallucinogen Persisting Perception Disorder (HPPD). Differentiating these conditions is crucial for accurate diagnosis and understanding their prevalence.
Area of Science:
- Neuroscience
- Psychiatry
- Pharmacology
Background:
- Classic psychedelic use is associated with specific perceptual disturbances.
- Hallucinogen Persisting Perception Disorder (HPPD), flashbacks, and reactivations are key complications.
- HPPD is characterized by persistent perceptual disturbances, unlike transient flashbacks or reactivations.
Purpose of the Study:
- To provide an overview of the phenomenology, epidemiology, and diagnostic classification of HPPD, flashbacks, and reactivations.
- To highlight the importance of differential diagnosis in patients with post-psychedelic complications.
- To discuss the clinical relevance and prognosis of these conditions.
Main Methods:
- Review of existing evidence from case reports and clinical experience.
- Phenomenological and epidemiological analysis of psychedelic-induced perceptual disturbances.
- Differential diagnostic considerations for HPPD, flashbacks, and reactivations.
Main Results:
- HPPD has a generally low prevalence but can be clinically significant.
- Flashbacks and reactivations are more common but less documented.
- Many patients presenting with post-psychedelic complications do not meet HPPD criteria, necessitating careful differential diagnosis.
Conclusions:
- Accurate differential diagnosis is essential to avoid inflating HPPD prevalence estimates.
- While HPPD can rarely become chronic, it often subsides within a year.
- Currently, evidence-based treatment options for HPPD are limited, relying on case reports and clinical experience.
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