Complete dosage information for O-Desmethyltramadol — threshold, light, common, strong, and heavy dose ranges across 3 routes of administration.
Full O-Desmethyltramadol profileImportant Safety Notice
Dosage information is for harm reduction purposes only. Individual sensitivity varies greatly. Always start with the lowest effective dose and work your way up slowly. Never eyeball doses — use a milligram scale.
## Overdose Information ### Recognition O-DSMT overdose presents as a classic **opioid overdose syndrome** characterized by the triad of: - **Respiratory depression**: Slow, shallow, or absent breathing (fewer than 12 breaths per minute, progressing to apnea) - **Miosis**: Pinpoint pupils (though this may be absent in severe hypoxia or mixed overdose) - **Decreased consciousness**: Ranging from drowsiness to complete unresponsiveness Additional signs may include cyanosis (blue-tinged lips and fingertips), gurgling or snoring sounds indicating airway obstruction, cold and clammy skin, and a weak pulse. Because O-DSMT lacks tramadol's SNRI component, **seizures are not a primary feature** of pure O-DSMT overdose, unlike tramadol overdose where tonic-clonic seizures are well-documented. ### Emergency Response **Call emergency services (911) immediately** — do not wait to see if the person "sleeps it off." Opioid overdose is a progressive emergency that can escalate from respiratory depression to respiratory arrest and death within minutes. ### Naloxone (Narcan) **Naloxone is effective** against O-DSMT overdose. As a pure mu-opioid agonist, O-DSMT's effects are fully reversible by naloxone — this is a meaningful advantage over tramadol overdose, where seizures from the serotonergic component are not opioid-mediated and will not respond to naloxone [1]. Administer naloxone intranasally (4 mg spray in one nostril) or intramuscularly (0.4 mg injection). If no response occurs within 2-3 minutes, administer a second dose. Be aware that O-DSMT's duration of action may exceed that of naloxone, meaning **re-sedation can occur** as naloxone wears off — ongoing medical monitoring is essential. ### Recovery Position If the person is unconscious but breathing, place them in the **recovery position** (on their side with the upper leg bent forward) to prevent aspiration of vomit. Keep the airway clear. Monitor breathing continuously until emergency services arrive. ### Post-Overdose Any opioid overdose requiring naloxone reversal demands **emergency department evaluation**, even if the person appears to fully recover. Observation for re-sedation, assessment for aspiration pneumonia, and evaluation of organ function are medically necessary. ## References [1] Boyer EW. Management of opioid analgesic overdose. N Engl J Med. 2012;367(2):146-155.
A common oral dose of O-Desmethyltramadol is 25–50 mg.
The threshold dose for O-Desmethyltramadol via oral is approximately 5 mg.
O-Desmethyltramadol typically lasts 6–10 hours via oral.
O-Desmethyltramadol can be taken via oral, sublingual, intravenous. Each route has different dosage ranges and onset times.
