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Methadone is a long-acting opioid agonist used primarily for two purposes:

Opioid Use Disorder (OUD) treatment (maintenance or withdrawal management) — reduces cravings and withdrawal symptoms. Severe chronic pain management (in non-OUD contexts, though less common).

It is a Schedule II controlled substance in the USA (DEA) and a narcotic under Canada's Controlled Drugs and Substances Act (CDSA). Access is heavily regu...

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