An Advanced Health Directive is a way to think about and plan what medical treatment you would like in the event that you cannot make decisions for yourself.
Information about advanced health directives and enduring powers of attorney in Queensland can be found here.
Information for other states can be found by doing an internet search.
Treatments
Ask questions. Ask your doctor and/or your pharmacist to write down or spell the names of the treatments that you will be having, and to explain their effects and side-effects.