A drug is a chemical that alters the way your body or brain works.
Some beneficial drugs can also be harmful if you have an overdose.
Drug Type Examples Effects
Stimulant Nicotine, Caffeine Increases brain and nerve activity
Depressant Alcohol, Temezapan Slows brain and nerve activity
Painkiller Paracetamol Blocks nerve impulses
Hallucinogen Cannabis, LSD Distorts what you hear/see
Performance enhancer Anabolic steroids Increases muscle development
Addiction - when a person becomes dependant on a drug. Their body may not be able to cope without it
Tolerance - the body learns to tolerate a drug so the addict must taker higher dosages to feel the same effects