Hallucinogen-Related Disorders are a group of substance use disorders related to the use of hallucinogens. In the DSM-5, hallucinogen-related disorders comprise of phencyclidine (PCP) use disorder, phencyclidine (PCP) intoxication, other hallucinogen (e.g. - LSD, MDMA) use disorder , other hallucinogen (e.g. - LSD, MDMA) intoxication, hallucinogen persisting perception disorder (HPPD), other phencyclidine-induced disorders, other hallucinogen-induced disorders, unspecified phencyclidine-related disorder, and unspecified hallucinogen-related disorder.