4-FA - Substance Search

Summary TheDrug.Wiki Erowid TripSit PsychonautWiki

4-Fluoroamphetamine (also known as 4-FA, 4-FMP, para-Fluoroamphetamine, PAL-303 and colloquially as Flux) is a novel synthetic amphetamine compound that produces a unique progressive mixture of entactogenic and stimulant effects when administered. It is part of a series of fluorinated amphetamine analog that initially included such compounds as 2-FA, 2-FMA, and 3-FA. Anecdotal reports have described the subjective effects of 4-FA as having a moderate MDMA-like entactogenic onset for the initial few hours of the experience that then gradually transitions into traditional amphetamine-type stimulation (for a total duration of around 6 to 8 hours) with residual effects that can last a few hours afterward.

Dose Information TheDrug.Wiki TripSit PsychonautWiki

ROA	Light	Common	Strong	Heavy
Oral	40-100mg	100-130mg	130-150mg	150mg+

Light Common Strong Heavy

Onset, Duration & After-effects TheDrug.Wiki TripSit PsychonautWiki

ROA	Onset	Comeup	Peak	Offset	After Effects	Total
Oral	30-60 min	30-75 min	2.5-3.5 hrs	2-3 hrs	6-12 hrs	6-12 hrs
Insufflated	2-10 min	15-30 min	2-3 hrs	2-3 hrs	6-12 hrs	4-8 hrs

Effect Profile

75 reports

Scores (1–10) curated from multiple sources:

Effect keyword matching from PsychonautWiki catalog
Validated against 57 Erowid trip reports
Weighted by importance: core (×3), major (×2), minor (×1)

Full methodology

Psychedelic 6.1

Strong 6/10

Strong auditory effects and body load with moderate visuals and headspace

Visual Intensity ×3

7

color enhancement pattern recognition enhancement

Headspace Depth ×3

6

thought connectivity time distortion confusion

Auditory Effects ×1

10

auditory distortion auditory hallucination

⚠ Body Load / Somatic Effects ×1

10

temperature regulation suppression teeth grinding bruxism increased heart rate sweating

Empathogen 10.0

Extreme 10/10

Strong empathy, euphoria, stimulation, and sensory enhancement

Empathy / Social Openness ×3

10

empathy, affection, and sociability enhancement empathy, love, and sociability enhancement increased sociability

Euphoria / Mood Elevation ×2

10

physical euphoria cognitive euphoria euphoria mood lift

Stimulation ×1

10

stimulation wakefulness teeth grinding increased heart rate

Sensory Enhancement ×1

10

tactile enhancement color enhancement increased libido

Stimulant 8.8

Intense+ 9/10

Strong stimulation, euphoria, focus, and anxiety/jitters

Stimulation / Energy ×3

10

stimulation wakefulness

Euphoria / Mood Lift ×2

10

physical euphoria cognitive euphoria euphoria mood lift motivation enhancement

Focus / Productivity ×2

10

focus enhancement analysis enhancement motivation enhancement thought acceleration

⚠ Anxiety / Jitters ×1

10

anxiety teeth grinding increased heart rate bruxism sweating

Based on reports from:

Erowid Experience Reports PsychonautWiki 4-FA The Drug Users Bible 4-FA

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 2d Half tolerance 7d Baseline ~14d

Anecdotal: tolerance builds quickly with repeated/weekly use and decays over 2–4+ weeks; cross-tolerance likely overlaps with other amphetamine-like stimulants and serotonergic releasers. Data quality is limited.

Cross-Tolerances

amphetamine

50%

methamphetamine

40%

MDMA

30%

Effects Erowid Bluelight

Aggregated from 57 Erowid and 18 Bluelight experience reports

Positive Effects 29

Stimulation 76.0% 89%

Euphoria 72.0% 92%

Sociability Enhancement 66.7% 86%

Empathy 42.7% 82%

Music Enhancement 41.3% 90%

Focus Enhancement 37.3% 84%

Tactile Enhancement 30.7% 85%

Body High 18.7% 82%

Color Enhancement 17.3% 82%

Thought Acceleration 16.7% 83%

Happiness 16.7% 90%

Joy 11.1% 90%

Mood Elevation 11.1% 82%

Confidence 11.1% 88%

Libido Enhancement 11.1% 78%

Introspection 10.7% 75%

Creativity Enhancement 6.7% 85%

Lightness 5.6% 85%

Buzzing 5.6% 85%

Thought Connectivity 5.6% 70%

Adverse Effects 32

Body Load 38.9% 74%

Anxiety 38.7% 72%

Increased Heart Rate 35.1% 70%

Pupil Dilation 29.8% 70%

Insomnia 27.8% 85%

Nausea 24.6% 70%

Visual Distortions 22.7% 68%

Muscle Tension 19.3% 70%

Headache 14.6% 75%

Confusion 13.3% 85%

Paranoia 11.1% 82%

Tremor 11.1% 78%

Delusion 11.1% 80%

Hot Flashes 11.1% 80%

Dry Mouth 11.1% 80%

Sweating 10.7% 85%

Memory Suppression 10.5% 70%

Disrupted Sleep Architecture 5.6% 80%

Distractibility 5.6% 75%

Focus Suppression 5.6% 75%

Combinations TripSit

Cross-Check 4-FA with another substance

Community Trip Reports

Anecdotal first-person accounts from Reddit, Erowid, and Bluelight. Click a source to expand. Reports are harm-reduction context, not medical guidance.

Erowid 8 reports 2 positive 5 neutral 1 cautionary visit

Fun but Not Too Fun positive exp #105214

I use amphetamines for certain therapeutic benefits, mostly to improve attention and mood. I enjoy psychedelics for recreational use but will occasionally use amphetamines or MDMA for recreation. Always via oral route.

Pleasant First Rendez Vous positive exp #94829

My previous experiences: Alcohol, tobacco, weed, magic mashrooms, LSD, ecstasy pills, meth, mephedrone, 3,4-DMMC, 4-MeMABP, diazepam, opiates (codein, morphine, opium, poppy tea). I have to mention that I have opiate habit (2O poppies/daily).

Not What I Was Expecting neutral exp #76313

Age: 19 Sex: Male Smoker: avg. ½ a pack/day Weight: 75 kg (about 165 lbs) Health: No health problems Medication: No medication Previous experiences: This is my first experience with this compound. Pretty much a novice in the area, Ive tried DPT, mephedrone, weed, 4-ho-met, DXM, MDPV and now 4-FMP.

First Multi-Day Ride neutral exp #98556

Howdy all, just thought I'd throw in my 2 cents about my 4-fa experiences for the general domain of knowledge. I first obtained 3g of this substance about 3 weeks ago and went through the whole 3g in a week, although I was sharing it pretty liberally some nights so my actual intake over a week was probably only 2g.

A Very Promising Substance neutral exp #90992

Substance: 4-FA fluffy white powder, bought from two vendors who both claim 99% purity, product appears identical from both vendors and seems to be from the same batch. Primary dose from one vendor, redoses from the other vendor.

The Hidden Potential neutral exp #98117

Chemical: 4-Fluoroamphetamine Dose: Approximately 140 mg to 170 mg (powder/crystals) Body: 70 kg or 155 lb Age at time of experience: 19 Experience date: October 30, 2012 Duration of the effects: 8 hours PROLOGUE: I am a 19 year old student. I have experience with Marijuana, Salvia, MDMA, Cocaine and Alcohol.

Clean Stimulation With Mellow Comedown neutral exp #92882

The 'trip' of this really isn't a dynamic journey as I would experience on a hallucinogen, so I will explain it in more of an outline/timeline of effects. I take recordings of my state and experience on a voice recorder whenever I notice the effects shifting.

4-Flourreal cautionary exp #101235

Back ground: I'm a 19 year old male, who has been battling drug abuse since I was 15 years old. I've recently come under better control of my drug use, and I'm not doing them as much, but this hasn't been without a few mishaps.

Bluelight 7 threads 1 positive 5 neutral 1 cautionary visit

4 Fmp First Time A Wonderful New Discovery positive

4-Fluoroamphetamine-First Time-A Wonderful New Discovery! This experience is a few months old, it occurred just after the New Year. I took notes during the experience but have subsequently lost them, so please forgive any gaps in my memory.

4 Fluoroamphetamine Semi Experienced Pushing My Limits neutral

Substance: 4-FA fluffy white powder, bought from two vendors who both claim 99% purity, product appears identical from both vendors and seems to be from the same batch. Primary dose from one vendor, redoses from the other vendor.

4 Fa 750mg Very Experienced Finally Got Burnt neutral

I have done most every drug you can name at least once; heroin, coke, LSD, MDMA, you name it. I've always preferred sertogenic stimulants over any other type of drug however, and I abused them as much as I could. Nothing was like 4-FA however.

4 Fluroamphetamine 4 Fa 4 Fmp neutral

23/10/2011 - 4-FA, Alcohol 17:31 - 128mg taken (128mg total) (4-FA) 20:14 - 104mg taken (232mg total) (4-FA) 00:50 - 1 Magners (440ml, 4.5% ) 01:11 - 1 Kopparberg (500ml, 4.5% ) Notes: 15:00 - Last ate All doses taken orally 20mg Cipralex taken daily 96 days since last stim (JGG, JWG) 21:26 - 500mg Magnesium 21:40 - 1/...

4 Fluoroamphetamine Experienced neutral

While having tried alot of sibutramine recently, as well as other substances, none of these motivated me to write about them in the same way as I am doing currently for the title compound.

4 Fmp First Time Warm Heart Smooth Sailing Long Rainy Night neutral

Taken from my report on erowid 4-Fluoroamphetamine -------------------------------------------------------------------------------- DOSE : 150 mg oral 4-Fluoroamphetamine (powder / crystals) BODY WEIGHT : 70 lb INTRODUCTION: 4-fluoro alpha-methylphenethylamine, or 4-FMP/4-FA for short is a largely unknown substance.

4 Fa 50 Mg First Time Soldering Stuff cautionary

Not a particularly detailed report because the events do not necessitate details. Received 1 g 4-FA this afternoon. Measured 30 mg and insufflated in two lines. Stings, but not as bad as other have made it out to be, and certainly nothing like 2C-xyz. After a few minutes, a notably clear and focused headspace arises.

4-FA's nerd page Pharmacology, chemical data, effect profiles, and more

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Helpful Links

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4-FA Well-documented Well-documented Multiple authoritative sources agree on dosing and effects. 6 corroborating sources 1 ROA with full dose ladder duration data present 20 combo interactions documented PubChem toxicity data classified Research-chemical