Mental health nurses address various mental health problems, assess health status and health risks, and provide counselling to patients and their families.
A psychologist is specialised in psychological counselling and prevention of mental health problems.
A social worker helps a person to develop or restore his or her independent psychosocial coping mechanisms.
The aim of addiction counselling is to help clients to better understand their addiction problem, to motivate them and to help them find the resources to make changes.
Harm reduction is aiming to reduce the harm and costs of drug use to the user, their loved ones and society at large.