Phenibut (chemical name is Beta-phenyl-gamma-aminobutyric acid), is a commonly available nootropic which is also available under the brand name of Noofen.

If you are looking for medication for anxiety, stress and sleeping aid, then most probably, your doctor or pharmacist will recommend you Phenibut.

In some countries, it is also available as an over the counter drug. However, in the USA it is still not FDA approved as a pharmaceutical product.

However, the effects of Phenibut are so instantaneous that it is widely used globally.

The instantaneous and after effects of Phenibut are discussed in detail in this article so that if you are considering this drug, you should be well aware of its positive as well as negative effects.

Usage and associated effects of Phenibut

Phenibut is used foremost as a stress reducer. It is recommended to people suffering from insomnia, anxiety and to treat the common emotional issues.

It boosts sleep cycles, making sleeping patterns more regular and stronger. It is also recommended to people who want to boost their cognitive abilities for shorter amounts of time.

However, the usage and dosage of Phenibut differ according to gender and health conditions of people involved.

For males, the recommended dosage of Phenibut is 2-2.5 g and for females, it is 1-1.2 g. The dosage also differs according to the medical history and health conditions of people.

The reason its usage and dosage is so different and should be monitored is that it is a strong drug and its effects are drastic and instantaneous.

Therefore, if you are looking for a drug that provides stable consistent results over the long term, then Phenibut is not for you.

However, if you are looking for a drug that starts giving instant results, then, surely Phenibut can meet your needs.

Effects of Phenibut (Subjective effects)

The subjective effects of Phenibut are discussed in great detail below.

Different effects occur at different intensities for people depending on their dosage and the longevity of the medicine intake. However, the most commonly reported effects of Phenibut are as follows:

Cognitive effects

  • Alleviate stress

    Phenibut is an excellent stress reliever. If taken on an empty stomach, the feelings of calmness and stress alleviation occur within 20-25 minutes of ingestion.

    It calms your nerves and provides a pleasant calm feeling for around 5-8 hours after ingestion.

    Alleviate stress

  • Alleviate anxiety and help minimize overthinking

    If you are an over thinker and find yourself being anxious all the time, then you can benefit from the usage of Phenibut.

    It reduces anxiety, makes you calm and composed, stops the noise around you from getting on your nerves and as a result stops you from anxious thought spiraling.

    People who overthink and get anxious as a result, specifically intense environments, can benefit from using Phenibut in recommended doses.

    However, if taken in high doses, it can make you groggy, therefore, make sure that you are taking Phenibut for a specific purpose and as per the recommended dosage.

    Alleviate anxiety and help minimize overthinking

  • Help minimize social anxiety

    Intake of Phenibut inculcates a feeling of wellbeing and composure, so its usage makes it easier for people to be around other people in different social settings.

    People who suffer from social anxiety can greatly benefit from Phenibut as it calms the nerves, makes you feel that ‘everything is and will be okay’ and thus, interactions with people around become relatively easier.

    Help minimize social anxiety

  • Improved brain function

    Usage of Phenibut makes you more alert and composed. Therefore, you become more conscious of the thoughts in your brain and how you can retain and use them.

    Therefore, it makes you better at problem-solving and decision making for short amounts of time.

    Phenibut is a transcallosal communication drug which improves brain function for the amount of time it is in the system.

    Improved brain function

Physical effects

  • Improved sleep quality

    If you have issues with sleep or you are suffering from Insomnia, then Phenibut is the way to go for you.

    If taken on the empty stomach, even small doses will improve your sleep cycles and the quality of your sleep.

    If a healthy lifestyle is maintained and Phenibut is taken in recommended dosages, then sleep quality can be improved within 1-2 weeks of regular usage.

    Most of the people who have difficulty sleeping report overthinking and anxious thoughts.

    Usage of Phenibut reduces overactive neural processing and makes the brain relatively calmer leading to ease in falling asleep.

    Improved sleep quality

  • Sedation and mental stimulation

    Phenibut is in a lot of news because of its high simulation and sedation effects. When consumed, it provides stimulation to the brain and makes it active.

    However, once the high is over, the brain and body get sedated and groggy.

    This effect is reported by people on varying doses so if you are starting usage of Phenibut for the first time, it will be trial and run for you for a few weeks.

    So, better to start using it on weeks when you are not working on urgent and critical deadlines.

    Sedation and mental stimulation

  • Dehydration and muscle cramps

    People who take high dosages of Phenibut also report dehydration and associated muscle cramps.

    Moreover, if you use more than one dose a day, then your chances of dehydration skyrocket.

    Therefore, make sure to drink plenty of water and fluids if you are on a high dosage of Phenibut.

    Dehydration and muscle cramps

  • Constipation

    On using Phenibut for more than 3-4 months, bowel movements get affected and constipation can happen.

    Therefore, if you are using Phenibut, it is recommended that you include a lot of fiber in your diet so that your bowel movements stay regular and are not adversely affected by the usage of this drug.


  • Sexual effects

    Phenibut can also impact your sex drive and reduce your libido. Therefore, be aware of this side effect before starting your dosage of Phenibut.

    Erectile dysfunction is also reported on regular usage of Phenibut but these issues are resolved as soon as the intake of Phenibut is stopped.

    Therefore, if you are starting the usage of Phenibut, then it is recommended that you share this associated side effect with your partner and communicate your concerns freely with your medical practitioner as well.

    If you are in a committed relationship and are starting the usage of Phenibut, then it is advised that you discuss the side effects with your partner so that both of you can work through the effects of this nootropic.

    sexual effects

After effects

  • Rebound anxiety

    If you are consuming Phenibut for anxiety and stop because you start facing other side effects, then it can make your anxiety worse.

    Therefore, if you start facing any issues with the usage, it is not advised to stop cold turkey, instead, go to a medical practitioner and develop a plan to phase out your usage of Phenibut so that you do not suffer from rebound anxiety.

    The reason it is important to have a phase-out plan is that rebound anxiety is often worse as the intensity of the anxiety is amplified as the system starts getting accustomed to no drugs.

    Moreover, if you suffer from anxiety, then use the Phenibut on recommended dosages and frequencies and do not skip the intakes as that can also make rebound anxiety worse as your system gets confused.

    Rebound anxiety

  • Residual sleepiness

    Phenibut is an excellent sleeping aid, however, if taken on the high dosage, or for people who get affected by such drugs to a high extent, it can make them groggy for the rest of the day as well.

    Therefore, if you work in a high-stress environment or have important deadlines coming up, make sure you do not try out Phenibut then.

    Instead, try it out on a less challenging week so that you realize what your body is accustomed to and if this suits you as a sleeping aid on normal days.

    Residual sleepiness

Recreational usage of Phenibut and why is it so?

Due to calming effects of Phenibut, it is often used recreationally as well. The effects of Phenibut are so calming and euphoric that people get addicted to using it and its effects.

The dark side of Phenibut is that its effects are similar to dopamine, which means that it starts feeling like an addiction and you get used to the ‘good life’ that you have when you are on Phenibut.

However, the side effects of Phenibut can affect your sex life, your academics, and the job as well as your normal bodily functions such as bowel movements and sleeping patterns.

Therefore, be very aware of the purpose of your usage of Phenibut and do not abuse it.

Moreover, if you are in Russia, it is sold as a nutritional supplement as well, and that makes you feel that it is safe to consume no matter how much you consume as it makes you feel so good.

However, as with all good things, caution must be exercised, and it should be consumed in prescribed quantities or else the side effects and intoxicating doses start occurring.

Jennifer Kurtz studied medicine at the New Jersey School of Medicine (Rutgers). She is passionate about developing her knowledge of Cannabis, Nootropics, Kratom, and nutritional supplements. In addition to attending medical webinars and conferences, she loves to write research-based articles for magazines, healthcare professionals, and medical agencies.