4B-MAR
Aliases: 4'-br-4-mar, 4-bromo aminorex
Summary
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.
Dose Information
Onset, Duration & After-effects
| ROA | Onset | Comeup | Peak | Offset |
|---|---|---|---|---|
| Oral / Sublingual | 20-60 min | 30-90 min | 2-4 hrs | 4-6 hrs |
| Insufflated | 10-30 min | 20-45 min | 2-4 hrs | 4-6 hrs |
| Vaporized / Smoked | 1-5 min | 5-15 min | 2-4 hrs | 3-5 hrs |
Effect Profile
Scores (1–10) curated from multiple sources:
- Effect keyword matching from PsychonautWiki catalog
- Weighted by importance: core (×3), major (×2), minor (×1)
Strong anxiety/jitters and focus with moderate stimulation, mild euphoria
Tolerance
Tolerance Decay
Pattern inferred from stimulant class and anecdotal reports: single heavy sessions can cause marked short‑term tolerance; partial decay over 1–2 weeks is typical. Data quality: anecdotal; avoid consecutive‑day redosing to limit cardiovascular strain and sleep deprivation.
Cross-Tolerances
Effects
- Stimulation
- Increased energy
- Increased perspiration
- Teeth grinding
- Pupil dilation
- Increased heart rate
- Vasoconstriction
- Insomnia
- Increased blood pressure
- Bruxism
- Focus enhancement
- Motivation enhancement
- Analysis enhancement
- Wakefulness
- Euphoria
- Anxiety
- Compulsive redosing
- Time distortion
- Thought acceleration
- Talkativeness
- Increased libido
- Increased music appreciation
- Visual enhancement
- Tactile enhancement
- Appetite suppression
- Light sensitivity
- Dehydration
- Disinhibition
- Double vision
- Dulled perception