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Created Aug 2019 | Updated Nov 2020


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DEA CODE 9226: Schedule 2 Narcotic


Once a pharmaceutical drug also known as isoamidone, this opioid analgesic and methadone analogue was withdrawn from the market and is seldom seen today. Rarely abused, though reports state it is around twice as potent as methadone, and more euphoric.

RouteOnsetDurationAfter Effects
Tripsit Factsheets
All ROAs:30-90 minutes30-40 hours1-24 hours
Isomethadone Duration
All other CNS depressants
Euphoria, Dry Mouth, Mood lift, Itchiness, Relaxant, Constipation, Pupil constriction, Analgesia.


A synthetic opioid analgesic and antitussive related to methadone that was formerly used as a pharmaceutical drug but is now no longer marketed.

  • A synthetic opioid analgesic and antitussive
  • Related to methadone
  • No longer marketed
  • Was used as both an analgesic and antitussive

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