4B-MAR
Encyclopedic
Encyclopedic
Typical encyclopedia coverage. Cross-reference for important decisions.
- 2 corroborating sources
- 4 ROAs with full dose ladders
- duration data present
- 18 combo interactions documented
- classified Research-chemical
- dose data not in PW/TripSit (unverifiable)
- 2 corroborating sources
- 4 ROAs with full dose ladders
- duration data present
- 18 combo interactions documented
- classified Research-chemical
- dose data not in PW/TripSit (unverifiable)
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
Dose basis. Ranges compiled from early user reports; no clinical PK/PD exists. Start with allergy test (≤1 mg). Weigh with 0.001 g scale; potency and stereoisomer ratios may vary by batch. Assumed similar to oral; slightly faster onset reported anecdotally. (Dose figures and this note are from Drugs.Wiki.)
| ROA | Light | Common | Strong | Heavy |
|---|---|---|---|---|
| Oral | 5-15mg | 15-40mg | 40-60mg | 60mg+ |
| Sublingual | 5-15mg | 15-35mg | 35-55mg | 55mg+ |
| Insufflated | 2-10mg | 10-25mg | 25-40mg | 40mg+ |
| Vaporized | 1-5mg | 5-15mg | 15-30mg | 30mg+ |
Onset, Duration & After-effects
| ROA | Onset | Comeup | Peak | Offset | Total |
|---|---|---|---|---|---|
| Oral | 20-60 min | - | 2-4 hrs | 4-6 hrs | 10-16 hrs |
| Sublingual | - | - | 2-4 hrs | 4-6 hrs | 10-16 hrs |
| Insufflated | 10-30 min | 20-45 min | 2-4 hrs | 4-6 hrs | 6.5-11.25 hrs |
| Vaporized | <1-2 min | - | 2-4 hrs | 4-6 hrs | 10-16 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
Add to PsychonautWiki Journal
The PsychonautWiki Journal logging app doesn't include every substance. To track 4B-MAR there, start adding an ingestion, search for the name, and choose to add it as a custom substance. Paste these values:
4B-MAR Source: SubstanceSearch (substancesearch.com) Oral dose (mg): threshold 5 · light 5-15 · common 15-40 · strong 40-60 · heavy 60+ Sublingual dose (mg): threshold 5 · light 5-15 · common 15-35 · strong 35-55 · heavy 55+ Insufflated dose (mg): threshold 2 · light 2-10 · common 10-25 · strong 25-40 · heavy 40+ Vaporized dose (mg): threshold 1 · light 1-5 · common 5-15 · strong 15-30 · heavy 30+ Oral duration: onset 0.33-1h · peak 2-4h · offset 4-6h · total 10-16h · after-effects 6-24h Sublingual duration: peak 2-4h · offset 4-6h · total 10-16h · after-effects 6-24h Insufflated duration: onset 10-30m · come-up 20-45m · peak 2-4h · offset 4-6h · total 6.5-11.25h · after-effects 6-24h Vaporized duration: onset <1-2m · peak 2-4h · offset 4-6h · total 10-16h · after-effects 6-24h Note: ranges are harm-reduction guidance, not a prescription. Start low, go slow, and test your substances.
Tip: for quicker logging you can also add a Custom Unit in the app, e.g. common dose ~ 27.5 mg (Oral).
The app keeps custom substances simple, so the full dose ranges live in the description text above. Ranges are harm-reduction guidance, not a prescription.
Tolerance
Tolerance Decay
Acute tolerance: develops within a single session — the reset numbers above apply after sustained heavy use, not after one binge. Within-session tachyphylaxis usually resets largely overnight.
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
Combinations
Cross-Check 4B-MAR with another substanceHelpful Links
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