|Summary sheet: Methoxphenidine|
|Common names||Methoxphenidine, Methoxyphenidine, MXP, 2-MXP|
|Routes of Administration|
Methoxphenidine (also known as 2-MXP or MXP) is a lesser-known novel dissociative substance of the diarylethylamine class. It is an NMDA antagonist with subjective effects similar to those of ketamine and phencyclidine (PCP). It is structurally related to diphenidine and ephenidine.
Methoxphenidine has been studied alongside other diarylethylamines as a treatment for neurotoxic injuries. The first reports of human recreational use appeared shortly after the 2013 U.K. arylcyclohexylamine ban, during which it and diphenidine began to be sold in powder and tablet form on the online research chemical market. It was initially marketed by vendors as a replacement for the highly popular methoxetamine (MXE) despite little to no evidence that it possessed similar effects.
Subjective effects include depersonalization, disconnective effects, conceptual thinking, increased music appreciation, and euphoria. Methoxphenidine belongs to a class of substances that can induce a hallucinogenic state known as "dissociative anesthesia", in which the user feels detached from their bodies.
Very little data exists about the pharmacological properties, metabolism, and toxicity of methoxphenidine and it has an extremely limited history of human usage. A number of fatal and non-fatal overdoses have been linked to the abuse of diarylethylamines. Additionally, a number of user reports suggest that they may carry different and more pronounced risks than traditional dissociatives.
It is highly advised to use harm reduction practices if using this substance.
History and culture
Methoxphenidine, or 2-MeO-Diphenidine, is a synthetic compound of the diarylethylamine class. Methoxphenidine's chemical structure contains a substituted phenethylamine skeleton with an additional phenyl ring bound to Rα. The terminal amino group of the phenethylamine chain is incorporated into a piperidine ring. Hence, methoxphenidine belongs to the piperidine dissociative class of compounds.
Methoxphenidine is a structural analog of diphenidine, featuring a methoxy group at the two position of a phenyl group.
MXP acts as an NMDA receptor antagonist. NMDA receptors allow for electrical signals to pass between neurons in the brain and spinal column; for the signals to pass, the receptor must be open. Dissociatives close the NMDA receptors by blocking them. This disconnection of neurons leads to loss of feeling, difficulty moving, and eventually an almost identical equivalent of the “k-hole.”
Although it has not been formally studied, the feelings of physical and emotional euphoria which many users report suggests that it may also have action as a dopamine and / or a noradrenaline reuptake inhibitor.
It should be noted that like other diaryethylamines, methoxphenidine is reported to have a much more rapid onset and lower half-life when vaporized or smoked. When consumed this way, it is a suspected to be carcinogenic when excess heat is used. Some user reports have concluded that vaporization requires as low as 20% of what would be a common oral dose for that person.
Disclaimer: The effects listed below cite the Subjective Effect Index (SEI), an open research literature based on anecdotal user reports and the personal analyses of PsychonautWiki contributors. As a result, they should be viewed with a healthy degree of skepticism.
It is also worth noting that these effects will not necessarily occur in a predictable or reliable manner, although higher doses are more liable to induce the full spectrum of effects. Likewise, adverse effects become increasingly likely with higher doses and may include addiction, severe injury, or death ☠.
The physical effects of MXP are most similar to that of DXM than other commonly used dissociatives. They can be broken down into several components which progressively intensify proportional to dosage. These are described below and generally include:
- Tactile disconnection - This results in typical states of progressive physical disconnection but is far more consciously controllable than that of other dissociatives. This allows one to choose how much of their body they are currently aware of and connected to simply by directing their focus towards it even throughout higher states of disconnection and out-of-body experiences.
- Pain relief
- Spontaneous physical sensations - The MXP "body high" is a soft, pleasurable vibrating sensation which can be felt all over the body which progressively intensifies throughout the onset before dissipating once the peak has been reached.
- Tactile suppression - This partially to entirely suppresses one's own sense of touch, creating feelings of numbness within the extremities. It is responsible for the anaesthetic properties of this substance.
- Motor control loss - A loss of gross and fine motor control alongside of balance and coordination is prevalent within MXP and becomes especially strong at higher dosages. This means that one should be sitting down before the onset unless they are experienced in case of falling over and injuring oneself.
- Euphoria - This results in feelings of physical euphoria which range between mild pleasure to powerfully all-encompassing bliss.
- Perception of bodily lightness - This creates the sensation that the body is floating and has become entirely weightless. This effect is strangely stimulating and encourages physical activities at low to moderate dosages by making the body feel light and effortless to move.
- Dizziness - Although uncommon, some people report dizziness under the influence of MXP.
- Physical autonomy
- Spatial disorientation
- Orgasm suppression
- Gait alteration
- Visual disconnection - This eventually results in MXP's equivalent of the famous "K-hole" or more specifically, holes, spaces and voids alongside of structures.
- Visual acuity suppression
- Double vision - This component is prevalent at moderate to heavy dosages and makes reading impossible unless one closes an eye.
- Pattern recognition suppression - This effect generally occurs at higher dosages and makes one unable to recognize and interpret perceivable visual data.
- Frame rate suppression
At high dosages, MXP 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. These effects include:
- Internal hallucination (autonomous entities; settings, sceneries, and landscapes; perspective hallucinations and scenarios and plots) - In comparison to other dissociatives, this effect can occur at heavy dosages, but is considerably less common than the same effect found within psychedelics and deliriants. It feels very dream-like and can be comprehensively described through its variations as delirious in believability, fixed in style, equal in new experiences and memory replays in content, extremely controllable in content and solid in style.
The cognitive effects of MXP are often described as particularly clear-headed in comparison to other dissociatives even at heavy dosages. It is far more controllable, less disorientating and confusing at dosages of equal subjective intensity to that of MXE, DXM and ketamine. The cognitive effects of MXP can be broken down into several separate subcomponents which are listed and described below:
- Dream potentiation
- Consciousness disconnection
- Thought acceleration
- Memory suppression
- Thought deceleration
- Increased music appreciation
- Analysis suppression
- Time distortion - Feelings of time dilation and more time having passed than it actually has are common at moderate to strong dosages.
- Conceptual thinking
- Anxiety suppression
- Distortions - The auditory distortion which is present at moderate to high doses of MXP can be described as a concomitant, audial component of frame rate suppression. This causes one to hear sound at a lagged frame rate. This can be described as 2 -15 seconds longer, with repeating, extremely distorted syllables at heavy dosages.
- Hallucinations - Audial time dilation experienced at moderate to heavy dosages can be described as being processed 2-5 seconds after occurring, having an extremely low frame rate with echoing, lengthy syllables.
- The afterglow describes the effects that can occur within 24 hours after the experience. Many users report the afterglow to be as long-lasting and desirable as the experience itself. It can be described in terms of its physical sensation as one of euphoria, rejuvenation, relaxation and a bodily lightness. In terms of its mental thought processes, it can be described as a significant reduction or loss of anxiety, feelings of contentedness and a highly increased appreciation for music which dissipates a day or so after the experience.
Anecdotal reports which describe the effects of this compound within our experience index include:
Additional experience reports can be found here:
Toxicity and harm potential
This toxicity and harm potential section is a stub.
As a result, it may contain incomplete or even dangerously wrong information! You can help by expanding upon or correcting it.
The toxicity and long-term health effects of recreational MXP use do not seem to have been studied in any scientific context and the exact toxic dosage is unknown. This is because MXP has very little history of human usage.
Anecdotal reports from those who have tried this substance that there do not seem to be any negative health effects attributed to simply trying it by itself at low to moderate doses and using it sparingly (but nothing can be completely guaranteed). Independent research should always be done to ensure that a combination of two or more substances is safe before consumption.
It is strongly recommended that one use harm reduction practices when using this substance.
Dependence and abuse potential
As with other NMDA receptor antagonists, the chronic use of MXP can be considered moderately addictive with a high potential for abuse and is capable of causing psychological dependence among certain users. When addiction has developed, cravings and withdrawal effects may occur if a person suddenly stops their usage.
Tolerance to many of the effects of MXP develops with prolonged and repeated use. This results in users having to administer increasingly large doses to achieve the same effects. After that, it takes about 3 - 7 days for the tolerance to be reduced to half and 1 - 2 weeks to be back at baseline (in the absence of further consumption). MXP presents cross-tolerance with all dissociatives, meaning that after the consumption of MXP all dissociatives will have a reduced effect.
Warning: Many psychoactive substances that are reasonably safe to use on their own can suddenly become dangerous and even life-threatening when combined with certain other substances. The following list provides some known dangerous interactions (although it is not guaranteed to include all of them).
Always conduct independent research (e.g. Google, DuckDuckGo, PubMed) to ensure that a combination of two or more substances is safe to consume. Some of the listed interactions have been sourced from TripSit.
- Depressants (e.g. 2M2B, alcohol, barbiturates, benzodiazepines, GHB/GBL, methaqualone, opioids) - This combination potentiates the muscle relaxation, amnesia, sedation, and respiratory depression caused by one another and at higher doses, can lead to a sudden, unexpected loss of consciousness along with dangerously depressed respiration. There is also an increased risk of vomiting while unconsciousness and dying from the resulting suffocation. If nausea or vomiting occurs before consciousness is lost, users should attempt to fall asleep in the recovery position or have a friend move them into it.
- Stimulants (e.g. amphetamine, cocaine, methylphenidate, MDMA) - This combination can potentiate the anxiety-inducing, manic, delusional and disinhibiting effects of dissociatives, particularly those without pronounced motor suppressing components such as ketamine. The sum of these effects can increase the likelihood of an anxiety attack, delusions or a psychotic episode. There is also evidence that suggests that combining these two increases their neurotoxicity. Anecdotally, worsened comedowns are also commonly reported when these two classes of substances are combined.
- Dissociatives (e.g. dextromethorphan, ketamine, methoxetamine, PCP) - Combination can unpredictably potentiate amnesia, sedation, motor control loss and delusions. It may also result in a sudden loss of consciousness along with a dangerous amount of respiratory depression. If nausea or vomiting occurs before consciousness is lost, users should attempt to fall asleep in the recovery position or have a friend move them into it.
- Canada: As of March 2016, MT-45 and its analogues, one of which is methoxphenidine, are schedule I controlled substances. Possession without legal authority can result in maximum 7 years imprisonment. Only those with a law enforcement agency, person with an exemption permit or institutions with Minister's authorization may possess the substance.
- China: As of October 2015, methoxphenidine is a controlled substance in China.
- Germany: Methoxphenidine is a controlled substance under the NpSG, as it is a derivative of 2-Phenethylamine. Production and sale is illegal. Possession and import, although illegal, is not penalized if intended for self-consumption.
- Italy: Methoxphenidine is a prohibited substance in Italy.
- Sweden: Methoxphenidine is a prohibited substance in Sweden.
- Switzerland: Methoxphenidine is a controlled substance specifically named under Verzeichnis E.
- Turkey: Methoxphenidine is a classed as drug and is illegal to possess, produce, supply, or import.
- United Kingdom: Methoxphenidine is illegal to produce, supply, or import under the Psychoactive Substance Act, which came into effect on May 26th, 2016.
- United States: Methoxphenidine is not currently scheduled in the United States. This means it is not specifically illegal but individuals may still be charged for its possession under certain circumstances such as under analogue laws and with the intent to sell or consume.
- Wallach, J., Kang, H., Colestock, T., Morris, H., Bortolotto, Z. A., Collingridge, G. L., ... & Adejare, A. (2016). Pharmacological investigations of the dissociative ‘legal highs’ diphenidine, methoxphenidine and analogues. PLoS One, 11(6), e0157021. https://doi.org/10.1371/journal.pone.0157021
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