- BZ is a hallucinogen first synthesised in 1954 in the USA. It can have an anticholinergic effect where it blocks certain acetylcholine receptors in the Nervous System. Only 1mg can cause delirium for days, with effects still present after weeks. https://www.sciencedirect.com/topics/neuroscience/3-quinuclidinyl-benzilate#:~:text=BZ%20is%20a%20psychotomimetic%20chemical,central%20nervous%20system%20(CNS). 3 comments science