What is a drug?

A drug is a chemical substance that affects the way the body works. This definition doesn't usually include things like food, air and water, although some herbs and spices can alter mental function, as can water intoxication.

Psychoactive drugs can include prescribed medications,Did you know.. alcohol, inhalants, and illicit drugs such as cannabis, heroin and methamphetamine.

When we look at the effects of psychoactive drugs, we need to think of how they might affect a person's thinking, feeling and behaviour.