Library
4-FMA
4-FMA is a novel stimulant-entactogen of the substituted amphetamine class, chemically related to both methamphetamine and 4-fluoroamphetamine. First detected in Japanese legal high markets in 2006, it gained wider popularity as a research chemical after 4-FA was banned in the Netherlands in 2017. User reports describe its effects as combining traditional stimulant and entactogenic qualities, subjectively situated between 4-FA and 2-FMA. Little is known about its pharmacology or toxicology.
Also known as: 4-fluromethamphetamine, Para-fluoromethamphetamine, 4-Fluoro-Metamphetamine (4-FMA), 4-fluoromethamphetamine
Classification
- Chemical: Amphetamine
- Psychoactive: Entactogen
- Psychoactive: Psychedelic
- Psychoactive: Stimulant
- Tag: Empathogen
- Tag: Habit-Forming
- Tag: Research-Chemical
- Tag: Substituted amphetamine
Effects
- Stimulation
- Increased Perspiration
- Bruxism
- Itchiness
- Insomnia
- Increased Energyalertness
- Euphoria
- Irritability
- Wakefulness
- Sociability Enhancement
- Increased Sociability
- Mood Lift
- Increased Libido
- Appetite Suppression
- Auditory Hallucination
- External Hallucination
- Increased Sexuality
- Visual And Auditory Hallucinations
Routes of Administration
Oral
Dosage
- Heavy: 125-200 mg
- Light: 15 – 50 mg
- Common: 50 – 75 mg
- Strong: 75 – 125 mg
- Threshold: 15 mg
Duration
- Onset: 0.33-0.67 h
- Comeup: 0.33-0.67 h
- Peak: 2-5 h
- Offset: 1-2 h
- After Effects: 3-12 h
Harm Reduction
Check interactions before mixing substances, pay attention to dose spacing and hydration, and treat all dosage guidance as approximate rather than guaranteed safe.
Sources
Substance data is aggregated from the following public harm-reduction and reference sources.
Links
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