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Product Name: 4F-MPH
IUPAC Name: 4-Fluoromethylphenidate
Other Names: 4-Fluoromethylphenidate , 4-FMPH , 4F-MPH
Cas Number: 1354631-33-6
Molecular Formula: C14H18FNO2
Molar Mass: 251.3 g/mol
Effect: stimulant, psychedelic
Purity of the substance: ≥99.8%
Physical properties: Crystals
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4-Fluoromethylphenidate: An Introduction

4-Fluoromethylphenidate (commonly referred to as 4F-MPH) emerges as a novel synthetic stimulant within the phenidate category, delivering prolonged euphoria and stimulation upon administration. It bears a striking structural resemblance to methylphenidate, a well-known ADHD medication known by the brand names Ritalin and Concerta.

A World of Differences

Despite sharing pharmacological mechanisms as monoamine reuptake inhibitors with methylphenidate, 4F-MPH exhibits distinct subjective effects. It is notably more euphoric and recreational, as per anecdotal accounts. Users often report its greater potency and fewer uncomfortable side effects, including anxiety, muscle spasms, and compulsive redosing. This may be attributed to its demonstrated superior performance as a dopamine reuptake inhibitor compared to methylphenidate.

Emergence and Availability

The recreational use of 4F-MPH is relatively recent and remains undocumented in street sales. Originally developed as a substitute for ethylphenidate, which faced legal prohibition in the United Kingdom in April 2015, it swiftly found its place on the online gray market, marketed as a research chemical with global availability.

Responsible Usage is Imperative

Given its potent and enduring stimulant effects, potential for habit-forming behavior, and uncertain toxicity profile, exercising caution and embracing harm reduction practices is highly recommended for those opting to use this substance.

Unraveling the Chemistry

4F-MPH represents a synthetic compound belonging to the substituted phenethylamine and substituted phenidate classes. As a fluorinated analog of methylphenidate, it features a phenethylamine core comprising a phenyl ring linked to an amino -NH2 group via an ethyl chain. Structurally reminiscent of amphetamine, it possesses a substitution at Rα, integrated into a piperidine ring that terminates at the phenethylamine chain's terminal amine. Furthermore, it encompasses a methyl acetate bound to Rβ. Notably, 4F-MPH is structurally identical to methylphenidate, distinguished only by a single fluorine atom attached to the four-position on the phenethylamine core.

Nomenclature and Chemistry

Methyl- in methylphenidate denotes the side chain involving one carbon atom, while phen- signifies the phenyl ring. Id- originates from the piperidine ring, and -ate denotes the acetate group housing oxygen atoms. Like its parent compound, 4F-MPH is a chiral molecule, likely produced as a racemic mixture.

Noteworthy is the scientific revelation that amphetamine analogs featuring fluorine, chlorine, bromine, and methyl groups are typically more potent compared to their counterparts without these substitutions.

Unveiling the Pharmacology

4F-MPH's primary mode of action is believed to involve the inhibition of dopamine and norepinephrine reuptake. Essentially, it elevates the levels of these neurotransmitters in the brain by binding to and partially obstructing the transporter proteins responsible for clearing dopamine and norepinephrine from the synaptic cleft. This accumulation in the brain's reward pathways results in stimulating and euphoric effects.

In a pharmacological assessment, the (±)-threo isomer of 4F-MPH is found to be 2.15 times more potent in inhibiting dopamine reuptake and 2.7 times more potent in inhibiting norepinephrine reuptake compared to methylphenidate. In contrast, the (±)-erythro isomer is significantly less effective, being 65 times weaker in dopamine reuptake inhibition and 45.6 times weaker in norepinephrine reuptake inhibition than methylphenidate. Neither racemate of 4F-MPH exerts a substantial influence on serotonin reuptake.

Physical Effects

Stimulation: 4F-MPH induces a distinct but milder stimulation than amphetamine or methamphetamine and is stronger than methylphenidate, modafinil, and caffeine. At lower to moderate doses, it boosts productivity, while higher doses promote physical activities such as dancing, socializing, running, or cleaning. The stimulation can be described as "forced" at higher doses, causing jaw clenching, bodily shakes, and loss of motor control, akin to methylphenidate.

Dehydration Nausea: May occur at higher doses but often subsides quickly.

Appetite Suppression: Less intense than amphetamine and methylphenidate.

Increased Heart Rate Abnormal Heartbeat Increased Perspiration Teeth Grinding: Less severe than MDMA.

Vasoconstriction Increased Libido: At higher doses, it enhances sexual desire, though less so than amphetamines and cocaine but more than methylphenidate.

Dizziness: May occur at higher doses but tends to fade.

Spontaneous Physical Sensations Pupil Dilation

After Effects

The aftermath of 4F-MPH use, known as a "comedown," is often marked by negative and uncomfortable sensations due to neurotransmitter depletion, including:

Anxiety Cognitive Fatigue: Equal in intensity to the prior enhancements.

Depression Irritability Motivation Suppression Thought Deceleration Wakefulness

Cognitive Effects

Users have reported positive cognitive effects similar to traditional stimulants, possibly due to its resemblance to methylphenidate. These effects include:

Anxiety: Stronger and more common than with amphetamine or cocaine.

Analysis Enhancement Euphoria: Short-lived and compulsive, akin to cocaine but less intense.

Compulsive Redosing: Occurs but less frequently than amphetamine or cocaine. Caution is advised to prevent excessive use.

Ego Inflation Emotion Suppression: More prominent compared to other stimulants, similar to methylphenidate.

Focus Enhancement: Most effective at low to moderate doses.

Increased Music Appreciation Time Distortion: Perception of time passing quickly.

Motivation Enhancement Memory Enhancement Suggestibility Suppression Thought Acceleration Thought Organization: More prominent than with other stimulants, used for productivity.


The toxicity and long-term health effects of 4F-MPH remain largely unstudied. Anecdotal evidence suggests no major health issues with moderate use. Caution is advised, and research on substance combinations is essential for safety.

Addiction Potential

4F-MPH can be used consecutively for extended periods, but users may develop tolerance, necessitating increased doses for the same effects. Tolerance builds faster than with methylphenidate. Due to its euphoric effects and action on dopamine transporters, 4F-MPH has potential for abuse akin to amphetamine or MDMA.

Legal Status

Germany: Initially controlled, accidentally legalized in September 2022.

Switzerland: Controlled substance under Verzeichnis E.

Turkey: Classified as illegal.

United Kingdom: Class B drug as of May 31, 2017.

United States: Schedule I controlled substance in Alabama.



What is 4F-MPH?

4F-MPH is a synthetic stimulant drug that belongs to the phenidate class. It is chemically related to methylphenidate (Ritalin) and is used for its stimulant effects.

Is 4F-MPH legal?

Legal status varies by country and jurisdiction. It is important to check your local laws and regulations regarding the use and possession of 4F-MPH.

What are the common street names for 4F-MPH?

Common street names for 4F-MPH may include "4F," "4F-MPH," or "4-Fluoromethylphenidate."

What are the effects of 4F-MPH?

4F-MPH can produce stimulant effects, including increased alertness, concentration, and energy. It may also lead to side effects such as increased heart rate and blood pressure.

What are the risks and side effects of 4F-MPH?

Risks and side effects of 4F-MPH may include anxiety, insomnia, increased heart rate, and potential for addiction. It can also have negative interactions with other substances.

Is 4F-MPH safe to use?

The safety of 4F-MPH use is a subject of debate. It should be used with caution and only as prescribed by a medical professional if applicable.

Can 4F-MPH be used for medical purposes?

4F-MPH is not approved for medical use in most countries, and there are safer alternatives for treating conditions like ADHD.

Where can I get 4F-MPH?

4F-MPH is not typically available through legitimate medical channels. Accessing it may involve legal and health risks.

What should I do if I have more questions about 4F-MPH?

If you have more questions or concerns about 4F-MPH, it's best to consult a medical professional or seek information from reliable sources.

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