Isomethadone (INN BAN; Liden) also known as isoamidone is a synthetic opioid analgesic and antitussive related to methadone that was used formerly as a pharmaceutical drug but is now no longer marketed. It binds to and activates both the μ- and δ-opioid receptors with the (S)-isomer being the more potent of its two enantiomers.
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