There are usually two main reasons people overdose. The person affected might make a mistake with their prescription medication, or perhaps, take too much of a drug when getting ‘high’ on an illegal substance. Others may want to cause deliberate harm to themselves.
Both require a response from those who are in a position to seek help for the person. If you're in need of immediate mental health support, call Lifeline on 13 11 14 and always call 000 in an emergency.