Hallucinogen
A hallucinogen was a psychoactive drug or other substance that caused hallucinations. Some hallucinogens, such as tropolisine, were naturally occurring in plants. ()

After Geordi La Forge was taken to sickbay with the effects of polywater intoxication in 2364, Doctor Beverly Crusher noted that tests showed no signs of hallucinogens, which they would have, were they present. ()

The venom of the nesset has hallucinogenic effects. ()

Nitrous oxide could cause hallucinogenic effects in some humanoid species, including Humans. Orions, however, were immune to this effect. ()

List of hallucinogens
 Nitrous oxide
 Psilocybin
 Tropolisine

External link
 
Drugs