The Ultimate Phenibut Dosage Guide

Phenibut is a popular mood-enhancing nootropic that interacts with GABA receptors in the brain to produce anxiolytic effects.

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What you will learn on this page​

  • Brief overview of phenibut
  • Safe dosing guidelines
  • Potential risks of overdose
  • Recommended usage


Phenibut is a nootropic compound that was first developed in Russia for use as an anxiolytic and sleep aid.  In recent years, it has gained popularity in North America as an alternative to prescription medications that treat similar conditions. 

The way in which phenibut works is actually quite unique and complex.  In fact, it affects the brain in a similar way as alcohol does -- by interacting with GABA receptors.  If you would like to know more about this compound then our extensive phenibut article is a great resource.  In this particular article we will be reviewing how much phenibut should you take. 

Getting The Most Out of Phenibut

Starting a new nootropics regimen of any kind can have a strong impact on one's life.  While most nootropics are legal to purchase without a prescription, they are still quite strong and should not be taken lightly -- phenibut is no exception.  

While phenibut is generally well tolerated with few health concerns, users should understand that side effects and withdrawal symptoms are possible outcomes if the necessary precautions aren't taken.  The primary difference between a positive and negative experience boils down to how the substance is used.

In particular, the phenibut dosage is a crucial factor to understand before incorporating it into your life.  Phenibut could possibly unveil a plethora of positive benefits such as improved mood and sociability, but it could also compound your problems if it is not used responsibly.

To further illustrate some of these points, please enjoy the video below...​

How To Take Phenibut

Phenibut is usually taken in either capsule or powder form.  Each method has its pros and cons.  Since it can be quite bitter, many people do prefer using capsules over powder, but powder is usually less costly in the long run and allows you to be more precise in your dosing. 

Much of the unpleasant taste can be masked by mixing your dose of phenibut in a sweet drink such as juice.  If that doesn't do it for you, you can always buy your own capsule machine and make them yourself.

How Much Phenibut Should You Take?

When you’re just starting out with phenibut, you need to make sure that you are getting a dose high enough to give desired effects, but low enough not to cause any undesired reactions.  When in doubt, take less.  You can always re-dose throughout the day as phenibut has a long half-life of about 5 hours.

The amount of phenibut that you take will depend on what your goals are. The standard recommended phenibut dosage for users who wish to reduce feelings of anxiety and stress is roughly 200 - 1000 milligrams taken throughout a 24 hour period.  When taken as a sleep aid, doses up to 2 grams can be tolerated but any amount beyond this is not recommended.

Dosage Guide








200 - 500mg

increased mood


500 - 1000mg

anxiety relief


1 - 2 grams

improved sleep

Very Strong

2+ grams


  • This table represents an ‘average’ amongst phenibut users and should only be used as a guide. Results may vary from person to person based on many factors.

It’s also important to mention that regular use of phenibut can cause tolerance to build up in some users. This means that you will end up requiring higher dosages over time to achieve the same results. To avoid this, stick to the lowest effective dosage rate and only use phenibut when you actually need its effects.

  • Food For Thought...

Recommended doses of phenibut have been identified for good reason. Taking more than this amount isn't only irresponsible, but downright reckless.

Risks of Overdose

Overdosing on phenibut is rare but very possible.  The affected person will most likely experience excessive vomiting, loss of memory, dizziness and confusion.  In some cases, hospitalization is required.  Since phenibut is a CNS depressant, it can also cause shallow breathing and lowered heart rate.

​It is important to remember that phenibut has a rather long onset and can take several hours after ingestion to produce effects.  Couple this with its long half-life and it is clear to see why many people may take too much -- believing that they didn't take enough.

​To avoid any confusion, please follow these safe-usage guidelines...

  • Never take more then 1 gram at a time
  • Do not exceed 2 grams in any 24 hour period
  • Wait at least 4 - 6 hours prior to re-dosing
  • Never mix phenibut with other drugs

Heed these tips and overdosing will never be a concern.

Cycling Your Dose

Cycling your phenibut is a great way to combat issues concerning dependence.  Using it intermittently will give your brain time to recover and will help to keep your neuroreceptors fresh and responsive.  

Some folks claim that it is safe to use phenibut every other day, while others may only take it once a week or less.  Everyone's body will react a little differently but generally we recommend leaving at least 3 days between your phenibut doses.

If your average dose is no longer doing it for you and you feel the urge to take more, then this is a good sign that you are becoming tolerant to the effects and could benefit from some time off.​

If you make the mistake of overusing phenibut then you need to taper your dosage down over time.  Stopping Phenibut usage abruptly can have some unpleasant withdrawal symptoms, especially if you are a regular user or someone who takes high doses.  

dose of phenibut

FYI; a full tablespoon of phenibut powder is way too much!

Closing Thoughts on Phenibut Dosage

As earlier mentioned, phenibut is generally safe and non-toxic.  While some of the negative effects may sound scary, they are easily avoidable.  If you follow the tips in this guide and use general common sense then you will likely have a positive experience with the compound.  The key takeaways are to stick to the recommended dosing range and don't use it too often.

If you are a new user, then starting from the lower end of the dosing spectrum is the recommended approach to avoid any unpleasant reactions.  With a little foresight and preparation, you should be able to enjoy the full benefits of this unique and rewarding supplement.

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Nicole Sanders

Hi, I'm Nicole, chief editor at Nootropics Revealed. Learn more about me and my mission here.