Phenibut: Reviews, Dosage, Effects & Where to Buy

Phenibut is a health supplement that puts you in a calmer state of mind and lets you sleep better.

But is it as effective as people say, and is it safe?

We'll answer these questions and more in our Phenibut review, starting with a quick look into the drug.

What Is Phenibut?

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Phenibut [R] is a central nervous system depressant medicine for the treatment of insomnia and anxiety. Some also use it to treat depression, motion sickness, stuttering, and alcoholism [R].

While it's available by prescription in Latvia, Russia, Ukraine, and Kazakhstan, it's not approved by FDA for medical use in Europe and North America for possible addiction. Nonetheless, many people in the US use it recreationally for its benefits as a nootropic. In contrast, others avail it for research uses.

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EffectsReduce anxiety and stress, increases motivation, improves sleep
Potential Side EffectsHeadache, dizziness, nausea, diarrhea
Half-Life5 hours
Common Dosage250 - 500 mg daily
Content50 g
Price$ 24.99
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How Does Phenibut Work?

Phenibut is popular among many users for its effectiveness in reducing anxiety and alleviating post-traumatic stress disorder. This is due to its chemical structure and the neurotransmitter GABA or gamma aminobutyric acid.

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GABA is a brain chemical that restricts impulses between the brain's nerve cells. It can be taken on its own as a dietary supplement, but it'll have less of an effect since it can't cross the blood-brain barrier.

Phenibut, on the other hand, can cross the blood-brain barrier and activate your brain's GABA receptors, creating a sense of relaxation by calming neural activity.

Phenibut also stimulates dopamine receptors causing feelings of pleasure and satisfaction.

Phenibut gets into the bloodstream after being metabolized by the liver. Depending on a person's physiology, it can take 2-4 hours to cross the blood-brain barrier after ingestion. Depending on the amount you select, the drug's duration of action can be five hours or more.

These potent effects lead many people to abuse the drug as a calmative or euphoria-inducing substance that, when abused, may lead to addiction.

What Is Phenibut Used For?

Because of its effectiveness for alleviating moods, reducing stress, anxiety levels, calming the nervous system, and other conditions that cause agitation, the drug is useful as a sleeping aid and anti-depressant medication. Some also use it as treatment of speech impediments such as stammering.

Phenibut Effects & Benefits

Due to its various effects, you can use it for the following:

Anti-Anxiety Treatment

Russian medical professionals widely prescribe it as a social anxiety reducer. You can use it to alleviate fear, tension, depression, post-traumatic stress syndrome, and asthenia. You can also use it as a calmative for pre- or post-operative medication.

Cognitive Enhancement

The one-month study involving 50 ADHD adolescents receiving daily doses of 500mg - 700mg showed improved sustained attention, self-control, and acoustic-verbal memory.‍

Many users claim that the nootropic properties of the drug make the thinking sharper and increase motivation.‍

Sleep Aid

Doctors in Russia commonly prescribe Phenibut for insomnia treatment. Claims show that in low doses, it improves their sleep.

Phenibut Dosage & How to Take

Start with the lowest effective dose. You can gradually increase the dose to get the desired effect. Since everyone's physiology is different, the lowest safe dose will vary from individual to individual.

Take 250-500mg three times daily for anxiety treatment. If you are under 60 years old, you can use a maximum single dose of 750 mg.

Avoid going beyond 4000mg a week, or you will suffer acute toxicity resulting in Phenibut dependence or addiction.

Phenibut Side Effects

To minimize the risk of developing an addiction or Phenibut dependence or experiencing other side effects, you should cycle your use of Phenibut and not use it continuously.

Also, taking Phenibut while using machinery can affect your concentration and lead to accidents. Plus, users may experience reduced impulse control and alcohol tolerance.

If you are on any medication on anti-depressants or any drugs from the SSRI family, talk to your doctor before using this to avoid addiction or adverse effects.

You can always check the internet for additional information or read cases from different countries to show evidence of Phenibut's influence on consciousness. There are references about its ingredients pointing to its reactions on patients, particularly experiencing an irregular heartbeat after administration.


If Phenibut dependence occurs, a user will experience intense withdrawal symptoms requiring professional help to overcome.

If experiencing addiction, the withdrawal symptoms may include:

  • Nausea and vomiting
  • Profuse sweating
  • Intense craving for a Phenibut dose
  • Diarrhea
  • Hallucinations
  • Fever

If you start experiencing withdrawal symptoms before your next Phenibut dose, begin "tapering" off your dosage.

Gradually reduce your doses by 25 percent each week for minimal withdrawal symptoms. If you suddenly stop instead of tapering off, the withdrawal symptoms can be intense and overwhelming.


Because Phenibut is unregulated in the United States, there's no general guideline regarding dosage. Many people report that they don't know how much to use, resulting in accidental overdoses and addiction resulting in psychosis. A Phenibut overdose can also occur due to a buildup of tolerance.

As tolerance increases, you will have to use higher doses of Phenibut to experience the desired effect. Doing this can lead you to use a higher dose than what your body can tolerate, resulting in Phenibut addiction.

An overdose can be fatal, depending on the amount, physiology of the user, and whether or not the user is on any other medication.

Phenibut Experiences Shared on Reddit

Here are what some Reddit users have to say about their experience using Phenibut:

According to rosamundi1975:

"…For me, 1500 is indeed a high dose and the most I've ever taken. I had nightmares for 2 nights after and severe anxiety. That being said, before I came off of it, I was feeling mighty fine! 500 to 750 is perfect for an avg sized woman"

According to u/doncheadle13

"… I've been using Phenibut for awhile now and it really makes me realize how cynical I can be sometimes. Phenibut can really get you back on track if you ever lose your way. sometimes I really do lose a little bit of motivation in life, a little bit of phenibut can remind you what's good in life, how simple life can be, and how much fun you really can have..."

Best Phenibut Stacks

Stacking means combining two or more nootropic supplements to amplify the effect of each. By stacking Phenibut with the right dietary supplements or products, you can get even better results from using the drug.

Stack for Mood and Anxiety

For those extra stressful days, you can amplify Phenibut's effect and improve sleep by stacking it with Phosphatidylserine and Bacopa Monnieri.

The recommended stack dose for this combination is 100 mg Phosphatidylserine, 300 mg Bacopa Monnieri, and 250 mg Phenibut. But remember not to use it for several days in a row as it can lead to an increased risk of tolerance and Phenibut addiction.

Stack for Athletic Recovery

If you want that extra boost during your workouts and quick recovery afterward, combining Phenibut with L-theanine and Centrophenoxine makes for a great recovery stack. It will boost your endurance, reduce body soreness, and increase your energy levels, enabling you to work out longer and harder.

The recommended dose for this stack is 200 mg L-Theanine, 250 mg Phenibut, and 250 mg Centrophenoxine.

Where to Buy Phenibut?

The quality of a drug goes a long way in determining its potency and safety. It's even more so when the drug in question is unregulated. For a reliable seller that consistently delivers quality batches of Phenibut, we recommend SwissChems.

Frequently Asked Questions (FAQ)

Your questions answered.

What Does Phenibut Feel Like?

According to users, using Phenibut feels like being drunk (euphoria and an improved sense of wellbeing), but without the grogginess or reduced motor skills that come with drug alcohol use.

How Long for Phenibut to Kick In?

How long it will take depends on your physiology and if you've used the drug with other substances. But generally, you can expect the drug to start taking effect after two or three hours.

How Long Does Phenibut Last?

Again, this depends on your physiology and how you use the drug. But generally, it has a half-life of five hours.

When Does Phenibut Withdrawal Start?

If you have developed a Phenibut addiction, withdrawal symptoms will typically manifest around 24 hours after your last dose. Once withdrawal starts, the symptoms will intensify until you take another dose.

How Long Does Phenibut Withdrawal Last?

The biggest symptom of withdrawal is an unrelenting need to use more Phenibut. That and other symptoms, such as nausea, hallucinations, depression, and more, can last for days.

How to Make Phenibut Work Faster?

You can speed up the onset by taking it on an empty stomach first thing in the morning. If you use it sublingually, it'll work even faster. Using it alongside caffeine or Theanine will also make it work more quickly.

How Long Does Phenibut Stay in Your System?

Based on its average half-life of around five hours, the total elimination time is typically about 26 hours.

How Often Can You Take Phenibut?

Do not use it more than twice a week. A safe dosage is around 250-1000mg of capsule or pill twice a week. But never use over 1000mg in a single go.

Does Phenibut Help with Sleep?

Depending on the dose, Phenibut's sedative-like properties can help you relax and sleep better.

Does Phenibut Really Work for Anxiety?

Because Phenibut boosts dopamine levels in the brain, it is good at suppressing central nervous system responses that cause nervousness. It makes users feel good and calm also helps with overcoming anxiousness.


While this substance is great for boosting your confidence, feeling good, and the treatment of anxiety and depression, the drug's potential for physical dependence makes its use tricky.

If you can stick with the recommended dose and don't have a history of substance abuse, you can give the compound a try for its benefits.

But if you are prone to addiction or are already on other medication, then perhaps Phenibut isn't for you.