Strong feelings of fear and depersonality, which can resemble a psychotic thrust, particularly with halluzinogenic consumption (LSD).
Flashbacks can occur week or months later after the last drug consumption, sometimes released by alcohol or cannabinoides.
Psychiatrist define flashbacks as "Hallucinogen persisting perception disorder", HPPD, whereby other causes, such as epilepsy, delirium or schizophrenia, are excluded. Classification of DSM-IV (Diagnostic and Statistical Manual of Mental Disorders) diagnosis key 292.89.