- A psychoactive drug, psychopharmaceutical, psychoactive agent or psychotropic drug is a chemical substance that changes functions of the nervous system, and results in alterations in perception, mood, cognition, and behavior.
Although the peoples roar like the roar of surging waters,
when he rebukes them they flee far away,
driven before the wind like chaff on the hills,
like tumbleweed before a gale.
Book of Isaiah 17:13 NIV