Methadone Is Used in Patients Who Need Pain Relief for a Long Time Around the Clock and Are Not Treated with Any Drugs to Alleviate Serious Pain. for People Who Have Been Drug Addicted and Participate for Recovery Services, It Is Often Used to Avoid Abseeding Symptoms in Order to Discourage or Continue Not to Take Medication. Methadone Is in an Opiate Analgesics Class of Medicines.