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What is True statement regarding methadone are all except: and explain in detail?
Ref: Goodman and Gilman 12th/506-507 Methadone *The onset of analgesia occurs 10-20 minutes after parenteral administration of methadone and 30-60 minutes after oral administration. *It is well absorbed from the GI tract and can be detected in plasma within 30 minutes of oral ingestion. *Primary uses are relief of chronic pain and in main tenance therapy of opioid addiction.