Experiences with 4-FMA: how it works and its effects explained

How 4FMA works

4-FMA is a synthetic stimulant from the amphetamine class and is known for its stimulating and empathic effects. This means that it can generate both energy and a feeling of emotional connection. 4-FMA works by increasing the release of neurotransmitters such as dopamine, serotonin and norepinephrine.

4-FMA effects

According to experience reports, 4 FMA appears to have a similar effect to 4-FMP, 4-FA, speed and MDMA. We have listed the effects of 4 FMA below:

• Improved empathy
• Creates a sense of togetherness
• Openness and talkativeness
• Enhanced sensory perception
• Desire to lose yourself in music, for example, by dancing
• More control than with ecstasy
• Cheerful feelings/better mood
• Visual and audio hallucinations
• Increased self-confidence
• No more fatigue/body's own energy
• Enhanced libido

In addition, the effect of 4FMA in the brain is also described as primarily affecting the neurotransmitter serotonin, more so than Speed, for example. This means that the user will feel happier during a 4-FMA experience.

Possible side effects

Although many users experience 4FMA as a stimulant with a euphoric effect, there are also possible side effects. These vary from person to person and depend on the dosage and frequency of use. Possible side effects include:

• Increased heart rate and blood pressure
• Dry mouth and tense jaws
• Insomnia or difficulty falling asleep
• Nausea or stomach problems
• Restlessness and anxiety
• A dip afterwards

We advise everyone not to consume 4-FMA, but if you do, you should definitely not combine it with other substances. At Funcaps, we therefore only sold 4-FMA for research purposes. It is strongly advised not to combine 4FMA with alcohol or painkillers. They will cancel each other out, which will lead to letting you believe you can take more, which is not the case. It is therefore important to use such substances responsibly. Hydration and sufficient rest can help to reduce certain symptoms. 

How can I prevent a 4-FMA hangover?

Sometimes people suffer from a mood drop or a 4FMA hangover. We did some research to find out how you can prevent this! First, it is wise to say: nothing has a 100% success rate, but you can at least try! It is recommended to get enough antioxidants, and magnesium should not be a bad idea either. Online, these substances are often combined in a single product. These anti-hangover remedies work naturally to combat the unwanted after-effects of a party. 

4FMA experiences

A 4-FMA experience is different for everyone. That is why we offer an average estimate of how quickly you will begin to feel the effects of 4FMA and how long the effects will last. The effects of 4FMA begin approximately fifteen minutes after the first increase in a test subject. Previous reports have also shown that the effects of this research chemical can last four to six hours. If the experiment were to be repeated here, the effects could last for almost a day. This is particularly evident in prolonged wakefulness and poor sleep. The comedown begins approximately five hours after ingestion. A drop in mood, which is more commonly found with similar research chemicals, has not been demonstrated with 4-FMA. However, because 4-FMA also acts on the serotonin receptors, it is likely that a dip can also be expected with this drug. Though the 4-FMA experience can be influenced by two factors: the dosage and method of intake.

The following figures are based on oral intake at an average dose:

• The expected onset time is about 20 to 40 minutes.
• The expected noticeable effects last about 3 to 5 hours.
• The after-effects will last approximately 3 to 6 hours.

With an average dosage via nasal intake, the following can be expected:

• The expected onset time is approximately 5 to 10 minutes.
• The expected noticeable effects last approximately 2 to 4 hours.
• The after-effects will last approximately 1 to 6 hours.

4FMA dosage to reduce risks

Most studies show that a dose of around 100 milligrams is recommended. Between 50 and 100 mg is considered a light dose and a medium dose between 100 and 150 mg. Doses above 150 mg are often experienced as intense.

HOW LONG DOES 4 FMA STAY IN THE BLOOD?

No extensive research has yet been conducted into the detection time of 4-FMA in the blood. Since the effects of this research chemical are like those of speed and other amphetamines, it is assumed that 4-FMA probably remains detectable in blood tests for 2 to 3 days. The same time span also applies to detection in urine, as demonstrated in independent studies. However, the exact duration of its presence in the body can vary based on several factors, including the dose taken, the individual's metabolism, and the frequency of use. It is important to consider these variables when evaluating the potential effects and risks of 4-FMA.

WHAT IS THE MAIN DIFFERENCE BETWEEN 4-FMP AND 4-FMA?

4-FMP has become illegal in many countries, including the Netherlands. However, 4-FMA was the new variant of this XTC light version. In 2023, 4-FMA was not illegal, but the government has imposed a ban on this drug, which came into effect on 1 July 2025. This means that production, trade and possession are officially illegal, so it will no longer be possible to buy 4-FMA as long as this law remains in force. The effects of 4-FMA are like those of the former 4-FMP. However, 4-FMA is slightly more similar to the effects of cocaine than those of XTC. Another difference is that 4-FMA is twice as strong as 4-FMP. This means there is a chance that the dosages of your experiment will reach an undesirable level.