There are 7 main categories of drugs:
Stimulants - Speed up the nervous system, make you feel excited. ex. caffeine
Depressants - Slow down the nervous system ex. ADHD medicine
Cannabinoids - from the cannabis plant. Puts you in a dreamy state. ex. pot
Hallucinogens - make you hallucinate and hear things
Masking agents - Hide the real drugs. Will result in negative if tested.
Opioids - Pain relieving medications that makes you sleepy ex. morphine.
The 7 Main Categories of Illegal Drugs