Well I'm not sure about hallucinating things, but what about Schizophrenia? It makes it very extremely difficult to tell the difference between whats really happening and whats not. Real - Non real . It's hard to explain.
angel dust
dramamine makes you hallucinate if u take 14 or more of them i took 20 and swore there was some1 in my yhouse and i started yellin at them and there was nobody there
cholesterol
A hallucinogen makes you hallucinate, or see/hear things that aren't actually there.
Ketamine. animal tranquilizer. makes you hallucinate.
After I took my medication, i had started to hallucinate.
alcohol
Yes, it is known that melatonin can make you hallucinate.
mediation or a head injuryPeople have used isolation tanks to hallucinate.
that would be meth
PCP. Also known as Angel Dust; quite possibly the most dangerous hallucinogen
Absinthe is rumoured to have that effect. it is often sipped through a sugar cube held between the teeth.