Here's what rhymes with hallucinogen.

Consider these alternatives

mescaline / seen psilocybin / frighten hallucinogenic / academic psychoactive / attractive amphetamines / means amphetamine / mean phenylethylamine / mean diazepam / can meprobamate / late ketamine / methamphetamine creatine / seen glucuronide / side methylphenidate / state ethidium / rubidium aphrodisiac / anaphrodisiac