DXM polistirex is an extended-release formulation where dextromethorphan is bound to a sulfonated styrene-divinylbenzene copolymer complex (an edible plastic), resulting in significantly slower absorption and prolonged effects compared to DXM HBr. Duration can extend 12-24 hours with residual effects lasting up to 48 hours. The extended-release mechanism increases the ratio of unconverted DXM to dextrorphan (DXO) in the bloodstream, producing more physical/sedating effects and less intense psychedelic/dissociative effects compared to immediate-release DXM HBr. It is more difficult to reach third plateau with polistirex preparations. Users report that approximately 1.5-2x the dose of DXM HBr may be needed to achieve equivalent effects.
Also known as: Dm, Robo, Delsym, Dxm er, Robitussin, DXM, Dextromethorphan polistirex, Tussin, Robotripping
Classification
Chemical: Morphinan
Psychoactive: Dissociative
Tag: Habit-Forming
Tag: Hallucinogen
Tag: OTC-medication
Tag: Over-the-counter
Effects
Physical Euphoria
Spontaneous Bodily Sensations
Nausea
Physical Disconnection
Sedation
Itchiness
Dissociation
Cognitive Euphoria
Time Distortion
Motor Control Loss
Immersion Enhancement
Memory Suppression
Spatial Disorientation
Visual Geometry
Internal Hallucination
Increased Music Appreciation
Visual Disconnection
Perception Of Bodily Lightness
Routes of Administration
Oral
Dosage
Threshold: ~30-60 mg poli
Light: 60-150 mg poli
Common: 150-300 mg poli
Strong: 300-600 mg poli
Heavy: >=600 mg poli
Duration
Onset: 0.75-3 h
Comeup: 0.5-1.5 h
Peak: 2.5-5 h
Offset: 6-12 h
After Effects: 12-48 h
Total Duration: 6-12 h
Harm Reduction
Check interactions before mixing substances, pay attention to dose spacing and hydration, and treat all dosage guidance as approximate rather than guaranteed safe.
Sources
Substance data is aggregated from the following public harm-reduction and reference sources.
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DXM HBr: DXM polistirex is an extended-release formulation where dextromethorphan is bound to a sulfonated styrene-divinylbenzene copolymer complex (an edible plastic), resulting in significantly slower absorption and prolonged effects compared to DXM HBr. Duration can extend 12-24 hours with residu
