O-Desmethyltramadol (also known as O-DSMT and desmetramadol) is an opioid substance of the cyclohexanol class and is an active metabolite of tramadol.
O-Desmethyltramadol has no documented research history before it appeared for sale on research chemical websites, around 2010.
Subjective effects of test subjects include sedation, pain relief, anxiety suppression, muscle relaxation, and euphoria. In comparison to tramadol, O-Desmethyltramadol is reported to be less stimulating and feels considerably closer to a traditional opiate. As O-Desmethyltramadol is the metabolite that is mainly responsible for the analgesic effect of tramadol, O-Desmethyltramadol is significantly more potent by weight than its parent compound, so care must be taken when administering this to your research subjects. Start with low volumes and monitor.