Dissociatives is short for dissociative anaesthetics. The dissociatives are one of the major classes of psychedelic drugs. Therapeutically, they act as anaesthetics by essentially disconnecting the brain for the body and sensation. At subtherapeutic doses, these drugs are psychedelics, and often powerfully so. The 3 dissociatives that are currently used recreationally are DXM (dextromethorphan), ketamine, and PCP.
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Dextromethorphan (DXM) is a dissociative anaesthetic used in many cough syrups and several other over the counter cough preparations because it also has antitussive actions. At doses higher than ordinarily used for cough suppression, it is a very powerful psychedelic drug. DXM is a morphine derivative that acts as a psychedelic by a psychopharmacological mechanism similar to ketamine and PCP.