Drugs are classified usually if they are illegal or legal, they are then classified further into Depressants, Stimulants or ​Hallucinogens. 

Drug

Depressants, slow the reaction time of the user as well as making them sleepy.



Stimulants, as the name suggests stimulate you and increase reaction time. They make you more awake and sometimes hyperactive.



Hallucinogens, also as the name suggests make you hallucinate. They affect the senses giving false messages.