4-BA
Aliases: Pba, 4-br-amp
Summary
para-Bromoamphetamine is a substituted amphetamine with stimulant and entactogenic properties that is highly neurotoxic to serotonergic neurons. Research shows it depletes brain serotonin for at least a week after administration, similar to para-chloroamphetamine. It acts as a weak MAO-A inhibitor, adding additional risks when combined with other serotonergic substances.
Dose Information
Light
Common
Strong
Heavy
Onset, Duration & After-effects
| ROA | Onset | Peak | Offset |
|---|---|---|---|
| Oral | 20-60 min | 1-3 hrs | 2-4 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)
Empathogen
6.4
Strong
6/10
Strong euphoria with moderate stimulation and sensory enhancement, mild empathy
Empathy / Social Openness
×3
5
empathy enhancement
increased sociability
Euphoria / Mood Elevation
×2
8
physical euphoria
cognitive euphoria
mood lift
Stimulation
×1
7
stimulation
wakefulness
teeth grinding
increased heart rate
Sensory Enhancement
×1
7
tactile enhancement
color enhancement
increased libido
Stimulant
4.2
Moderate
4/10
Strong anxiety/jitters and euphoria with moderate stimulation
Stimulation / Energy
×3
6
stimulation
wakefulness
alertness enhancement
Euphoria / Mood Lift
×2
8
physical euphoria
cognitive euphoria
mood lift
Focus / Productivity
×2
0
Anxiety / Jitters
×1
10
anxiety
increased heart rate
teeth grinding
vasoconstriction
Based on reports from:
Tolerance
Build-up
develops over days to weeks of regular use
Reset
3–7 days for acute; 1–3 weeks for full reset
Tolerance Decay
Full tolerance
1d
Half tolerance
12d
Baseline
~21d
Effects
Positive
- Stimulation
- Physical euphoria
Negative
- Insomnia
- Increased heart rate
- Temperature regulation suppression
- Teeth grinding
- Pupil dilation
- Vasoconstriction
- Increased perspiration
- Neurotoxicity symptoms
Positive
- Mood lift
- Empathy enhancement
- Increased sociability
- Alertness enhancement
- Cognitive euphoria
- Wakefulness
Negative
- Anxiety
- Motivation suppression
- Thought deceleration
- Talkativeness
Positive
- Tactile enhancement
- Increased music appreciation
- Increased libido
- Tracers
- Color enhancement
- Pattern recognition enhancement
Negative
- Appetite suppression
- Light sensitivity
- Dehydration
- Disinhibition
Combinations
4-BA's nerd page
Pharmacology, chemical data, effect profiles, and more
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