Hallucinogen-induced Delirium is characterised by an acute state of disturbed attention and awareness com specific features of Delirium that develops during or soon after substance intoxicação or during the uso of hallucinogens. The amount and duration of hallucinogen uso must be capable of producing Delirium. The symptoms are not better explained by a primary mental transtorno, by uso of or abstinência from a different substance, or by another health condition that is not classified under Mental, behavioural and Transtornos do neurodesenvolvimento.