Depression (clinical depression) is a condition or mental state which impacts negatively upon a person's mood, energy levels, capacity to deal with stress and decision making. Depression is very common across the whole community, with up to 20% of people experiencing symptoms of depression at some time. There is a link between clinical depression and the incidence of drug overdose. This is probably because people are more likely to use a range of substances to try to cope with the feelings of depression and are likely to be less careful about the quantities and/or combinations of drugs used.

If you (or someone close to you) are feeling depressed, it may be helpful to talk to a GP or counsellor about the issues that are causing the depression. If your doctor suggests a course of anti-depressants to help you break out of the cycle of depression, it is a good idea to discuss with them any other drugs you use and the possible effects of using while you are taking anti-depressant medication.

Some of the support groups listed in Chapter 15, Quick Guide, particularly those under 'Information, support, counselling and advocacy', may also be helpful. The website www.beyondblue.org.au contains information about depression and lists sources of help and support for sufferers, family and friends.