Dextromethorphan
Dextromethorphan (DXM) is a morphinan-class dissociative commonly found in over-the-counter cough suppressants.12 First approved by the FDA in 1957, it acts primarily as a prodrug, with most dissociative effects mediated by its metabolite dextrorphan through NMDA receptor antagonism. Despite its structural similarity to opioids like codeine, dextromethorphan lacks significant mu-opioid receptor activity.1 Its widespread availability in household cold medicines has made it one of the most accessible dissociatives, contributing to its prevalence as a recreationally misused substance.3
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
This dosage scale applies to DXM HBr, adjust accordingly to molecular mass. DXM polistirex requires ion exchange to free DXM from the polymer it is bound to, resulting in greatly increased duration and onset akin to that of long-release formulations. To match the peak plasma concentration (and thus effects) of DXM HBr with Polistirex, around double the dose is required.
Duration
Subjective Effects
Effects vary widely by individual, dose, and context.
Physical
The subjective physical effects of DXM can be broken down into nine components all of which progressively intensify proportional to dosage.
Cognitive
The head space of DXM is often described as particularly impairing, disorientating and generally less clear headed in comparison to that of MXE and Ketamine.
Visual
This substance does not enhance visual stimuli; instead it tends to degrade and decrease visual aptitude in a variety of ways.
Distortions
DXM exhibits a full array of dissociative distortions and alterations in visual perception.
Geometry
The visual geometry found within DXM can be described as intricate in complexity, fast in movement, soft in edges, rounded and angular in corners, large in size, immersive in presence and very brightly coloured in scheme when compared to that of MXE.
Hallucinatory States
At high dosages, DXM can produce a full range of high level hallucinatory states in a fashion that is less consistent and reproducible than that of many other commonly used psychedelics.
Auditory
The auditory effects of DXM are common in their occurrence and exhibit a range of effects.
Pharmacology
Pharmacodynamics
Dextromethorphan functions primarily as a prodrug of its more potent metabolite dextrorphan, which mediates most of its dissociative effects through uncompetitive NMDA receptor antagonism at the PCP binding site.5 The parent compound also contributes directly through strong sigma-1 receptor agonism and serotonin transporter inhibition6, with sigma-1 activity potentially contributing to motor effects, tachycardia, and mydriasis. Dextromethorphan additionally acts as a negative allosteric modulator of nicotinic acetylcholine receptors, particularly α3β4 subtypes.7 Despite its morphinan structure, dextromethorphan lacks significant mu-opioid receptor activity and does not produce the analgesia, sedation, or respiratory depression typical of related opioid compounds. Published binding affinities vary considerably between studies, with reported values for sigma-1 ranging from 23 to 150 nM and SERT from 40 to over 2000 nM.
Pharmacokinetics
Dextromethorphan is rapidly absorbed from the gastrointestinal tract and undergoes extensive first-pass hepatic metabolism.5 The primary metabolic pathway involves O-demethylation via CYP2D6 to the active metabolite dextrorphan5, accounting for approximately 80% of dextrorphan formation. A secondary pathway involves N-demethylation via CYP3A4 to 3-methoxymorphinan5, which contributes over 90% of that metabolite's production. Both pathways converge on 3-hydroxymorphinan, with subsequent glucuronidation and sulfation. The elimination half-life varies substantially based on CYP2D6 activity, ranging from approximately 4 hours in extensive metabolizers to 13 hours or longer in poor metabolizers. Approximately 1 in 10 individuals of Caucasian descent exhibit reduced CYP2D6 activity.9
Dangerous
Highest riskThese combinations are considered extremely harmful and should always be avoided. Reactions to these drugs taken in combination are highly unpredictable and have a potential to cause death.
Unsafe
AvoidThere is considerable risk of physical harm when taking these combinations, they should be avoided where possible.
Caution
Use cautionThese combinations are not usually physically harmful, but may produce undesirable effects, such as physical discomfort or overstimulation. Extreme use may cause physical health issues. Synergistic effects may be unpredictable. Care should be taken when choosing to use this combination.
Tolerance
Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.
Dissociatives (all NMDA receptor antagonists)
Harm Potential
Addiction & Dependence
Psychological
LowPsychological addiction is uncommon but documented.10 Some users develop craving and emotional dependence with regular use, finding it difficult to stop.10 DXM is considered less addictive than opioid-based cough suppressants like codeine, though it is classified as habit-forming.
Physical
LowPhysical dependence is not well-established.10 Long-term regular users report withdrawal symptoms similar to antidepressant discontinuation syndrome, including disturbances in sleep, senses, movement, mood, and cognition.10 Some users report a 1-2 week hangover period after stopping regular use. Life-threatening withdrawal has not been documented.10
Toxicity
Chronic heavy use over extended periods may cause cognitive deficits including impaired episodic memory, learning difficulties, and abnormalities in visual processing and abstract language comprehension;10 the theory that DXM causes Olney's lesions (brain vacuolization) remains inconclusive in humans, and oral administration in rats did not produce such lesions.11
Acute increases in systolic and diastolic blood pressure along with increased heart rate occur at high doses;10 serious cardiovascular events are primarily associated with overdose or products containing stimulant adulterants.
Urinary retention becomes increasingly likely at higher doses and may result in complete inability to urinate at very high doses; this is an acute effect during intoxication rather than chronic damage.
Psychosis Risk
Psychotic symptoms including delusions, paranoia, and detachment from reality occur at high doses, particularly at third plateau and above.10 Plateau sigma (extended high-dose sessions) carries high risk of delirium and psychosis. Extended heavy use over days or weeks may cause lasting delusional, paranoid, and psychotic ideation persisting for weeks, months, or longer after cessation.10
Seizure Risk
Seizures have been reported in overdose scenarios.13 Many reported seizure cases involve adulterants such as chlorpheniramine maleate rather than DXM itself.10 States of agitation with epileptic episodes may occur at very high doses.
History & Culture
Discovery and Development
The racemic parent compound racemethorphan was first described in patent applications by Hoffmann-La Roche in Switzerland and the United States in 1946 and 1947, respectively, with a patent granted in 1950. Resolution of the two isomers using tartaric acid was published in 1952. Dextromethorphan…
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Legality
By Country
References
Source Pages
Citations
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- Elliot W. McClure, Ryan M. Chavera, Cody J. Marraffa, & Ryan A. Bohn. (2023). Classics in Chemical Neuroscience: Dextromethorphan (DXM). ACS Chemical Neuroscience, 14(12), 2256-2270. https://doi.org/10.1021/acschemneuro.3c000881
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- Linda Nguyen, Matthew J. Robson, Jason R. Healy, Anna L. Scandinaro, & Rae R. Matsumoto. (2014). Involvement of Sigma-1 Receptors in the Antidepressant-like Effects of Dextromethorphan. PLoS ONE. https://doi.org/10.1371/journal.pone.00899851
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