The range of medical, psychological, and social services designed to help individuals reduce or stop substance use and manage substance use disorders. Treatment may include assessment, counselling and behavioural therapies, medication-assisted treatment, withdrawal management, and support for co-occurring mental or physical health conditions. Effective treatment is typically person-centred and evidence-informed, and may be provided in outpatient, community, or residential settings. Treatment aims to improve health and functioning, reduce substance-related harms, and support individuals in moving toward recovery and long-term wellbeing.