Psychoactive drug

A psychoactive or psychotropic drug was a chemical substance that altered brain functions and changed behavior and perception.

In 2373, Miles O'Brien and a team from Deep Space 9 discovered that soldiers from the Cardassian Third Battalion, First Order had been given large amounts of a psychotropic drug likely designed to heighten Cardassian xenophobia. Elim Garak came into contact with the drug and later killed Amaro while under the influence of it. 

In 2382, a Breen soldier told an that they should use a psychoactive drug to gain information from Sarina Douglas, although the inquisitor was wary of doing so due to their lack of knowledge of Human biochemistry. 

Caffeine acts as a psychotropic drug to the Liruq.