The plateau system for describing DXM experiences was developed by William White and has become the standard framework for the community. Understanding what each plateau actually involves helps you make informed decisions about dosing.
The 1st Plateau (1.5–2.5 mg/kg)
The 1st plateau is sometimes dismissed as “not worth it” but it’s actually a valuable experience in its own right and an essential starting point for new users.
Subjectively, the 1st plateau produces mild stimulation — some users describe it as similar to a very pleasant caffeine effect combined with mild euphoria and significant music enhancement. Dissociation is present but subtle. You remain fully oriented; you know who and where you are. Coordination is only mildly affected.
This is the appropriate plateau for first-time users. It gives you access to the substance’s most appealing qualities without significant disorientation, and lets you understand how your body specifically responds before escalating.
The 2nd Plateau (2.5–7.5 mg/kg)
This is what most people think of as the “classic” DXM experience. Dissociation becomes significant — the feeling of being both present and detached simultaneously. Music becomes profound. Closed-eye visuals emerge, typically geometric and patterned. Euphoria is often strong.
Coordination is meaningfully impaired. Walking requires attention. Fine motor tasks become difficult. This is the plateau where needing to have your environment prepared in advance becomes non-optional.
The 2nd plateau is where a sitter transitions from “a nice idea” to “strongly recommended.”
The 3rd Plateau (7.5–15 mg/kg)
The 3rd plateau represents a significant qualitative shift from the 2nd. The dissociation becomes profound enough that you may lose your ordinary sense of self — your sense of continuous personal identity. This can be terrifying without preparation and a sitter, or deeply meaningful with them.
Open-eye visuals become strong. Reality may feel fractured, layered, or fundamentally strange. Speech becomes difficult or impossible. The ability to call for help or orient yourself to your situation is significantly compromised.
A sitter is essential at the 3rd plateau. Not recommended. Essential.
The 4th Plateau (15+ mg/kg)
The 4th plateau — sometimes called “sigma hole” — involves near-complete disconnection from ordinary reality. Many users report complete amnesia for the experience. The risk of physical harm from disoriented movement, as well as risk from the dose itself, is significantly elevated.
This is not a plateau most experienced harm reductionists recommend intentionally pursuing. The potential consequences are severe, the therapeutic benefit unclear, and the experience often unpleasant even in retrospect (what can be remembered of it).