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Chemical Names: 4-Fluoroamphetamine
Molecular Formula: C9H12FN
Molecular Weight: 153.20 g·mol−1
IUPAC Name: (RS)-1-(4-Fluorophenyl)propan-2-amine


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4-Fluoroamphetamine , also known as para-fluoroamphetamine (PFA) is a psychoactive research chemical of the phenethylamine and substituted amphetamine chemical classes. When you find where to buy 4FA  do note it produces stimulant and entactogenic effects, and is described subjectively as being between amphetamine and MDMA. As a recreational drug, 4FA  for sale is sometimes sold along with related compounds such as 2-fluoroamphetamine and 4-fluoromethamphetamine.

4-Fluoroamphetamine is a substituted amphetamine that offers effects somewhere between those of amphetamine and MDMA. It’s been a member of the research chemical market since the late 2000s.

It has at times been a more popular research chemical because it does have a unique and potentially desirable effect profile.

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4-FA is popular in the Netherlands where it is predominantly used for its specific effects (77% of users) rather than its legal status (18%). Before you find where to buy 4FA it had become illegal since May 2017.

4-Fluoroamphetamine = 4-FA; 4-FMP; PFA; Para-Fluoroamphetamine; Molly’s Mosquito

PubChem: 9986

Molecular formula: C9H12FN

Molecular weight: 153.2 g/mol

IUPAC: 1-(4-fluorophenyl)propan-2-amine

Dose when Buy 4-FA Online, Buy 4-Fluoroamphetamine Online


Light: 25 – 50 mg

Common: 50 – 100 mg or 100 – 150 mg

Strong: 150+ mg

The common dose range depends on what effects you’re looking for. A lower amount (50 – 100 mg) is better for productivity, while a higher amount (100 – 150 mg) usually makes the drug more recreational.



Total: 4 – 7 hours (at least somewhat longer for the stimulation vs. entactogen activity)

Onset: 20 – 40 minutes

Effects of Buy 4-FA Online, Buy 4-Fluoroamphetamine Online


  • Euphoria
  • Mood improvement
  • Music enhancement
  • Increased talking
  • Physical euphoria
  • Disinhibition
  • Increased empathy
  • Increased sociability


  • Bruxism
  • Insomnia
  • Appetite suppression
  • Headache
  • Anxiety
  • Irritability
  • Vasoconstriction
  • Increased heart rate
  • Increased blood pressure

It’s generally described as a cross between amphetamine and MDMA. The effects are cleaner and more entactogenic than amphetamine, but definitely not as entactogenic as MDMA.

The wakefulness is equivalent to or greater than MDMA, as is the case with some of the pro-social effects. Users don’t report the stimulation to be very forced or uncomfortable in most cases.

As was already mentioned, the effects are dose-dependent. It’ll be primarily like amphetamine under 100 mg and a bit more MDMA-like over 100 mg.

Users tend to report a calm mindset with the drug and the chance of anxiety or agitation appears lower than with amphetamine. It’s often very pro-social with common or strong doses. An MDMA-like floatiness may be present.

The effects often have a wave-like nature, meaning there can be short periods where it feels like you’re much closer to sober. 4-FA has a smooth onset period and typically doesn’t produce a negative comedown or strong negative day-after effects.


If you’re taking a more recreational amount, the main effects will last 4-5 hours and be followed by more amphetamine-like stimulation for a few more hours.


It’s not going to be particularly useful as a productive stimulant when over 100 mg is used. Around 50 to 75 mg is reportedly useful as a productivity aid, similarly to common amounts of amphetamine. Also, it may be productive once the core entactogenic-like effects have worn off with higher doses.

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A 2015 survey of 249 people in the Netherlands gives some idea of the typical effects and how 4-FA is used. Most people reported taking it in festivals, dance parties, and clubs. They primarily obtained it through friends or online shops.

77.1% used the drug because of its specific effects, not because of its legal status. Most participants first reported taking it around 2013.

Oral was the most common route of administration (92.8%). 100 – 150 mg was the most common dose range, though close to 20% used over 150 mg.

Participants said it lasted either 4 to 6 hours or 6 to 8 hours.

The actual effect scores were between those for MDMA and amphetamine.

Compared to amphetamine

  • Less irritability
  • Greater talkative and pro-social effects
  • Lower “craving” score
  • Similar to alertness and stimulation
  • Greater euphoria and “connectedness to others”
  • Greater “changes in sensory perception.

Compared to MDMA

  • Lower intensity, confusion, and dizziness
  • Also. Lower “craving”
  • As well As, Lower euphoria and “connectedness to others”
  • And, Lower “changes in sensory perception.”

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Additional information


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