Https://medixway.com/pain-relief/methadone/ Methadone is used to treat moderate to severe pain when around-the-clock pain relief is needed for a long period of time. This medicine should not be used to treat pain that you only have once in a while or "as needed". Methadone is also used together with medical supervision and counseling to treat opioid use disorder (eg, heroin or other ... https://medixway.com/pain-relief/methadone/