What term describes distorted perceptions or hallucinations that mimic an LSD "trip" occurring days to weeks after usage?

The term that refers to the experience of distorted perceptions or hallucinations that can occur days to weeks after using LSD is known as flashbacks. This phenomenon is characterized by the spontaneous re-experience of certain aspects of the drug experience, including visual distortions, altered sounds, and other sensory experiences that were prominent during the initial intoxication. Flashbacks can be disorienting and may occur without warning, often triggered by stress or exposure to certain environments that evoke the original trip experience.

In contrast, hallucinations are generally associated with immediate drug intoxication and do not specifically refer to the delayed recurrence seen with flashbacks. Delirium refers to an acute, confused state that can occur due to various medical conditions or intoxication but does not specifically relate to the lingering effects of psychedelics like LSD. Psychosis denotes a severe mental disorder characterized by a disconnection from reality, which is not specifically tied to the aftereffects of LSD use.