O-Desmethyltramadol (O-DSMT) is an opioid that has primarily been used indirectly due to it being a primary metabolite of the analgesic tramadol. Since the 2010s it has occasionally been used on its own as it has been sold through the grey market/research chemical market.
It has a longer duration than tramadol and more typical opioid-like effects, although it still impacts monoaminergic systems to an extent that might somewhat influence the effect profile.
TDC Overview Page (with references): https://thedrugclassroom.com/video/o-desmethyltramadol-o-dsmt/
O-Desmethyltramadol = O-DSMT; Desmetramadol; O-Demethyltramadol
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