Depersonalization from Memantine

Depersonalization is a subjective experience of unreality or detachment from one's own sense of self, body, or mental processes. The person may feel as though they are observing themselves from outside their body, that their actions are happening automatically without their conscious direction, or that their thoughts and memories do not truly belong to them. There is a pervasive sense that the self has become unfamiliar, mechanical, or somehow artificial, as though one's identity has been hollowed out or placed behind a pane of glass.

The experience can range from a mild feeling of disconnection from one's own emotions and actions to a profoundly disturbing sense that one does not exist as a real person at all. At lower intensities, it may manifest as a subtle feeling of going through the motions or a sense that one's reflection in a mirror belongs to a stranger. At higher intensities, the person may feel completely detached from their physical body, watching themselves act and speak as though they were a puppet or a character in a film. One's own hands, voice, and face may seem alien, and autobiographical memories can feel as though they belong to someone else entirely.

Depersonalization is classified as a disconnective effect and is closely related to, but distinct from, derealization. While depersonalization involves a sense of unreality directed inward toward the self, derealization involves a sense of unreality directed outward toward the external world. The two effects frequently co-occur and are collectively recognized in clinical psychology as depersonalization-derealization disorder when they persist outside of substance use. During substance-induced episodes, both effects typically resolve as the substance is metabolized.

This effect is most commonly induced under the influence of moderate to heavy dosages of dissociative compounds such as ketamine, PCP, and DXM, where it forms a core component of the dissociative experience. However, depersonalization can also be triggered by cannabis (particularly at high doses or in cannabis-sensitive individuals), psychedelics, and to a lesser extent during the withdrawal of depressants, SSRIs, and benzodiazepines. Stress, sleep deprivation, and meditation can also produce the effect in susceptible individuals without any substance involvement.

Depersonalization is often accompanied by other coinciding effects such as anxiety, depression, time distortion, derealization, emotional blunting, and identity alteration. The anxiety that frequently accompanies depersonalization can create a feedback loop in which the distressing sense of unreality triggers anxiety, which in turn intensifies the feelings of disconnection. For most substance users, the effect is transient and resolves within hours to days, but in rare cases, particularly with cannabis or psychedelics, it can persist for weeks or longer.

While depersonalization is inherently distressing for many people, some individuals within the dissociative and psychedelic communities intentionally seek it out as part of the experience of ego dissolution or consciousness exploration. In therapeutic contexts, controlled experiences of depersonalization during ketamine therapy have been associated with shifts in perspective that some patients find beneficial for processing trauma or breaking rigid patterns of self-concept.