Disregard Everything I Say

Light : 100 - 200 mg
Common : 200 - 400 mg
Strong : 300 - 600 mg
Heavy : 600 - 900 mg
Risk of Death : 900 - 20,000 mg
Duration : 4 - 8 hours

DXM or Dextromethorphan is an antitussive (cough suppressant) drug. It is one of the active ingredients in many over-the-counter cold and cough medicines, including Robitussin, Delsym, Benylin and others, including many generic labels. It is a dissociative hallucinogen of the Morphinan chemical class with multiple mechanisms of action. These include actions of a nonselective serotonin reuptake inhibitor, inhibiting the reabsorption of the neurotransmitter serotonin even after it has performed its function of transmitting a neural impulse, essentially allowing it to accumulate and be reused, causing physically euphoric effects. It is also a sigma-1 receptor agonist, allowing for its antitussive effects, and the action of its major metabolite dextrorphan as an NMDA receptor antagonist, essentially blocking the connections between neurons and creating for its dissociative effects. Instead of acting as a direct antagonist of the NMDA receptor itself, Dextromethorphan is rapidly absorbed from the gastrointestinal tract and converted into the active metabolite dextrorphan in the liver; a metabolite that is nearly 10 times more potent and the true mediator of this substance’s dissociative effects.

It was first patented and approved by the U.S. Food and Drug Administration (FDA) in 1954 and subsequently sold as an over-the-counter cough suppressant in 1958, with the first record of its recreational use dating back to 1962.
Although it is often considered to be a “kiddie drug” by many people within the online drug community, to me it is without doubt, visually on par with all of the other commonly used dissociatives such as Ketamine, MXE and PCP, and an extremely powerful substance. It takes its users to impossibly deep states of detachment and rich hallucinations, the base components of which I will begin to break down and describe now…

Body high:
The body high of DXM is that of a euphoric glow that encompasses the body and is accompanied by a tingling sensation at the ends of the fingers and toes. At higher doses the overall sensation increases proportionally and is capable of becoming physically euphoric. It is incredibly relaxing and results in a mostly lethargic state, consistently causing trippers to want to lay down on a comfortable spot and enjoy the trip, instead of engaging in physical activities.
As a user increases their dosage, physical detachment begins to take its toll and the body high is slowly taken over by a warm, mechanical numbness, which at higher doses is capable of becoming completely anesthetic-like in its effects. This can be described as starting out with sensations of being removed from the body, physical autonomy and a proportional lack of motor control. One of the famous characteristics of a low dose DXM trip is the way in which it causes people to move in way that the DXM community has named the “robo-walk”. This is more than a simple lack of motor control and spatial awareness but a hilariously strange and robotic style of movement that I have yet to find on any other substance. 
As physical detachment continues to increase, it eventually ends with a complete disconnection from the physical senses and out of body experiences, leaving people in a conscious catatonic state.

Head space:
The thought patterns of a typical DXM trip are characterized by that of a child-like sense of glee, a vastly enhanced sense of music appreciation and a bizarrely profound drunkenness.
As a user increases their dosage, mental detachment begins to take its toll and any thoughts present within the brain are slowly taken over by bizarre mental states of dissociation. These can be described at lower levels as feelings of detachment from the external environment, making the world seem as if it were being watched through a TV, a dream or just intrinsically unreal in some way.
This creates a feeling of being mentally withdrawn from the environment, allowing people to look at their lives from an almost third person perspective and analyze it without bias, surprisingly resulting in an enjoyable state of deep introspection.
As the detachment increases, the ego becomes severely suppressed and inhibited, something that eventually results in ego death. This impairs cognitive functioning and suppressing the short term memory until it begins to struggle or become completely incapable of holding onto a normal thought for any length of time.

Perspective distortions:
The perspective distortions on DXM do not seem to feel particularly different from those found on other commonly used dissociatives such as MXE and Ketamine. These most commonly include Alice in Wonderland syndrome, the feeling of becoming impossibly giant or tiny in size. Changes in noise volume, sounds seeming either extremely loud or very quiet and muffled are often experienced, as well as distortions in distance, making specific objects or the entire external environment seem physically closer or further away.

Visual effects:
At lower levels of dissociation, the visual effects of DXM are extremely simplistic and shallow, generally manifesting themselves as blurred and double vision and only becoming deep once a person has been partially or completely disconnected from their body and sensations. This results in out of body experiences in which trippers fly through a distinct and unique hallucinatory world.
This starts at lower levels with the dissociative equivalent of visuals, which for DXM, can be described as morphing geometric patterns which are super imposed onto a dark background. This doesn’t feel as though they are on a flat two dimensional veil in front of your vision as with LSD or mushrooms but instead completely surrounding and encasing your visual field. In comparison to other dissociatives such as MXE, they are extremely colourful, complex and fast moving. They only present themselves when the eyes are closed and generally seem to consist of soft round edges with a pastel colour palette and flat simplistic imagery that is usually comprised of basic shapes such as bubbles, squares and triangles.
In comparison to the classical psychedelics they are not nearly as intricate but still extremely impressive. They do not seem to increase in complexity as a person reaches higher levels of dissociation, but are instead taken over by and replaced once complete and total disconnection of the body is reached, causing trippers to slip into what is refereed to as a dissociative hole. This can be described as the sensation of silently floating through a dark and infinite void. This void is often interpreted as traveling through space or the night sky. This is usually accompanied by monolithic, solid and physical structures of a vast scale that pan, zoom or rotate into and out of view as you float above, below or inside of them. This is a common characteristic among all of the dissociatives but can be described as particularly colorful in appearance with this substance, especially when compared to the likes of other dissociatives such as MXE. 
These structures take a huge variety of forms but can be described as spires, towers, tear drops, columns, cubes and shapes of any kind that are huge in size and often thousands of miles wide. They alternate between each other by morphing in a comprehensible, consistent way or by panning out of view until another structure takes its place. As a tripper’s dosage increases, the level of detail in which these structures are seen and felt increases proportionally. This continues until the sensation of seeing the entire universe is condensed into an infinitely intricate form becomes present. This is accompanied by the sudden realization that you are the structure you are staring down upon, a feeling that is so overwhelming and vast it consistently triggers complete ego death.
At this level of dissociation, hallucinatory states not unlike those found within common psychedelics come into play, these are extremely diverse imagined scenarios in which contact with autonomous entities are completely possible. They look perfectly solid in appearance and are not constructed from an incomprehensible visual based material, as with psychedelic substances such as DMT and mushrooms. Reports of memory replays are extremely common and these often overlay themselves onto the external environment in the form of people you have recently seen becoming present in your field of vision.

After glow:
The afterglow is a feeling that is long lasting and as equally enjoyable as the trip itself to many people. It can be be described in terms of its physical sensation as one of euphoria, rejuvenation, relaxation and a light bounciness. In terms of its mental thought processes however, it can be described as a complete loss of anxiety, contentedness and an extremely high appreciation for music.

Grapefruit Potentiation:
It’s worth noting that grapefruit juice is extremely efficient for potentiating and enhancing the DXM trip if approximately 1 glass of white grapefruit juice or more is drunk every hour throughout the day before the trip. The effects will be considerably stronger and more intense. For people who are drinking store brought syrup, this is extremely useful as it means drinking less foul syrup. 
The Grapefruit juice acts on DXM by inhibiting the activity of cytochrome P450 enzymes of the 3A and 1A groups. DXM is converted to DXO by this same enzyme, only with different groups. Therefore, with enough grapefruit juice, your overall trip should be more intense, as the DXM is converted into DXO at a faster rate.

Conclusion:
In conclusion, DXM is an extremely powerful drug, capable of taking people to incredibly rich induced mystical and transcendental states. This is despite the fact that it is nothing more than the active chemical in generic over the counter cough syrup and legal in every country across the world. If you want to try DXM, your easiest bet is visiting your local pharmacy, supermarket or buying it in pure form online. Pure powder can be found with a quick google search for the term “DXM powder buy”, “pure dextromephorphan buy” or other similar phrases, usually being sufficient to find a supplier in the top 3 or 4 links. In the UK specifically, Benilyn non-drowsy cough syrup is sold behind the counter in Boots, Morrisons, Sainsburys, Tesco’s and probably ASDA.
It is definitely worth noting however that DXM does have a dark side to it, with potentially addictive effects for those who are lacking in self control and adverse physical effects with repeated long term usage. This is something that can easily be avoided by manually limiting your use of the substance. It’s because of this that I would recommend doing as much research as you possibly can before even considering the consumption of this drug.