Dissociatives are a class of hallucinogen which distort perception of sight and sound and produce feelings of detachment – dissociation – from the environment and/or self. Although many kinds of drugs are capable of such action, dissociatives are unique in that they do so in such a way that they produce hallucinogenic effects, which may include sensory deprivation, dissociation, hallucinations, and dream-like states or anesthesia. Some, which are nonselective in action and affect the dopamine and/or opioid systems, may be capable of inducing euphoria. Many dissociatives have general depressant effects and can produce sedation, respiratory depression, analgesia, anesthesia, and ataxia, as well as cognitive and memory impairment and amnesia.
The effects of dissociatives can include sensory dissociation, hallucinations, mania, catalepsy, analgesia and amnesia. According to Pender (1972), "the state has been designated as dissociative anesthesia since the patient truly seems disassociated from his environment." Both Pender (1970) and Johnstone et al. (1959) reported that patients under anaesthesia due to either ketamine or phencyclidine were prone to purposeless movements and had hallucinations (or "dreams") during and after anaesthesia. Some patients found the hallucinations euphoric while others found them disturbing.
At sub-anesthetic doses, dissociatives alter many of the same cognitive and perceptual processes affected by other hallucinogenic drugs such as mescaline, LSD, and psilocybin; hence they are often contrasted and also considered hallucinogenic. Perhaps the most significant subjective differences between dissociatives and the classical hallucinogens (such as LSD and mescaline) are the detaching effects, including: depersonalization, the feeling of being unreal, disconnected from one's self, or unable to control one's actions; and derealization, the feeling that the outside world is unreal or that one is dreaming.
Many dissociatives such as ketamine are used as anesthetics for surgery or pain relief in medical contexts such as in hospitals. However, due to possible psychotomimetic reactions they are sometimes used reluctantly. Certain morphinan dissociatives such as Dextromethorphan are also used in sub-psychoactive dosages to suppress coughing.
Ketamine is also currently being studied and is showing promising results as a possible fast-acting antidepressant It may also function as a possible palliative treatment for C-PTSD and chronic pain.
Some dissociative drugs are used recreationally. Ketamine and nitrous oxide are club drugs. Phencyclidine (PCP or angel dust) is available as a street drug. Dextromethorphan-based cough syrups (often labeled DXM) are taken by some users in higher than medically recommended levels for their dissociative effects. Historically, chloroform and diethyl ether have been used recreationally (as was nitrous oxide, at laughing gas parties).
- NMDA receptor antagonist
- Dissociation (neuropsychology)
- Dissociation (psychology)
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- Media related to Dissociatives at Wikimedia Commons