There are 3 broad categories into which drugs are classified. They are:
• Central nervous system stimulants
• Central nervous system depressants
• Hallucinogens

(Click here for general signs suggesting alcohol or other drug abuse)

Stimulants

• Cocaine/Crack
  
• Ecstasy
  
• Kat
  
• Tik
  
• Tik (Crystal Methamphetamine)
  

Depressants

• Alcohol
  
• Dagga
  
• Heroin
  
• Inhalants
  
• Mandrax
  
• Tranquillisers
  

Hallucinogens

• LSD
  
• Magic mushrooms