ICD-11 Criteria for Disorders due to use of Dissociative Drugs Including Ketamine and Phencyclidine [PCP] (6C4D) Disorders due to use of dissociative drugs including ketamine and phencyclidine [PCP] are characterised by the pattern and consequences of dissociative drug use. Dissociative drugs include ketamine and phencyclidine (PCP) and their (comparatively rare) chemical analogues. Ketamine is an intravenous anaesthetic widely used in low- and middle-income countries, particularly in Africa, and in emergency situations. Ketamine is also undergoing evaluation for treatment of some mental disorders (e.g., treatment resistant Depressive Disorders). It is also a widespread drug of nonmedical use in many countries and may be taken by the oral or nasal routes or injected. It produces a sense of euphoria but depending on the dose, emergent hallucinations and dissociation are recognised as unpleasant side effects. Phencyclidine has a more restricted worldwide distribution and also has eupho