Library
4B-MAR
First definitively identified in Austria in January 2022 and sold online as racemic trans-diastereomer (approximately 90% assay purity). No peer-reviewed pharmacodynamic studies yet exist; structure-activity relationships and subjective reports suggest potency slightly lower than 4-methylaminorex but still active at sub-25 mg doses. User reports from Bluelight and research forums indicate threshold effects at 2-4 mg insufflated and functional amphetamine-like stimulation around 15-25 mg with 12-18 hour wakefulness but modest euphoria. Analytical characterization confirms bromine isotopic LC-HRMS signature (m/z 255.0133 [M+H]+) and chiral separation reveals racemic trans-diastereomer form. Purity differences between batches (85-98%) warn of potential inactive filler or active by-products.
Also known as: 4'-br-4-mar, 4-bromo aminorex, Para‑bromo‑4‑methylaminorex, P‑bromo‑4‑methylaminorex, 4‑bromo‑4‑methylaminorex
Classification
- Chemical: Aminorex
- Psychoactive: Stimulant
- Tag: Research-Chemical
Effects
- Stimulation
- Increased Perspiration
- Teeth Grinding
- Pupil Dilation
- Jaw Tension
- Coldness
- Focus Enhancement
- Motivation Enhancement
- Analysis Enhancement
- Wakefulness
- Time Distortion
- Anxiety
- Appetite Suppression
- Light Sensitivity
- Increased Libido
- Dehydration
- Bodily Control Enhancement
- Increased Music Appreciation
Routes of Administration
Oral / Sublingual
Dosage
- Threshold: 2-5 mg
- Light: 5-15 mg
- Common: 15-25 mg
- Strong: 25-40 mg
- Heavy: 40 mg
Duration
- Onset: 0.33-1 h
- Comeup: 0.5-1.5 h
- Peak: 2-4 h
- Offset: 4-6 h
- After Effects: 6-24 h
Insufflated
Dosage
- Threshold: 2 mg
- Light: 2 mg - 10 mg
- Common: 10 mg - 25 mg
- Strong: 25 mg - 40 mg
- Heavy: 40+ mg
Duration
- Onset: 0.17-0.5 h
- Comeup: 0.33-0.75 h
- Peak: 1.5-3 h
- Offset: 4-6 h
- After Effects: 6-24 h
- Total Duration: 8-14 h
Vaporized / Smoked
Dosage
- Threshold: 1 mg
- Light: 1-5 mg
- Common: 5-15 mg
- Strong: 15-25 mg
- Heavy: 25 mg
Duration
- Onset: 0.02-0.08 h
- Comeup: 0.08-0.25 h
- Peak: 2-4 h
- Offset: 3-5 h
- After Effects: 6-24 h
Oral
Dosage
- Heavy: 60+ mg
- Light: 5 mg - 15 mg
- Common: 15 mg - 40 mg
- Strong: 40 mg - 60 mg
- Threshold: 5 mg
Duration
- Onset: 0.33-1 h
- Peak: 2-4 h
- Offset: 6-10 h
- After Effects: 6-24 h
- Total Duration: 10-16 h
Sublingual
Dosage
- Heavy: 55+ mg
- Light: 5 mg - 15 mg
- Common: 15 mg - 35 mg
- Strong: 35 mg - 55 mg
- Threshold: 5 mg
Duration
No data available for this section yet.
Vaporized
Dosage
- Heavy: 30+ mg
- Light: 1 mg - 5 mg
- Common: 5 mg - 15 mg
- Strong: 15 mg - 30 mg
- Threshold: 1 mg
Duration
- Onset: 0.05-0.08 h
- Peak: 0.5-2 h
- Offset: 4-8 h
- After Effects: 6-24 h
- Total Duration: 8-14 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.
Links
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