Phenibut was initially developed in the 1960s in Russia as an anti-anxiety (anxiolytic) drug with cognitive enhancing properties. It has since attracted a strong following of users in the "smart drug" market, with claims of boosting memory recall and exam performance. Originally given to Soviet cosmonauts to combat anxiety and insomnia, the powdered drug is suspected to have played a role in the recent overdose of seven teenagers at a Queensland private school.


Phenibut, also known as pbut, noofen, party powder (or its scientific name β-phenyl-γ-aminobutyric acid and brand name Bifren), is a psychotropic drug, which means it affects the user's mental state. The drug is similar in structure to a type of neurotransmitter known as neurotransmitter γ-aminobutyric acid (GABA), which plays a role in reducing excitability and anxiety, as well as enhancing euphoria and cognitive function. Phenibut binds to a specific subtype of the GABA receptor, activating a similar reaction as GABA.

Once phenibut reaches the brain, the result is reduced anxiety and social inhibition. Because it depresses the central nervous system (like GABA), it is also used as a mood elevator and tranquiliser. Phenibut is structurally similar to the widely prescribed drug baclofen (Lioresal), which is available in Australia. Baclofen is prescribed as a muscle relaxant for patients with conditions such as multiple sclerosis.


Phenibut can be used to treat anxiety, post-traumatic stress disorder, alcohol withdrawal syndrome and vestibular (balance) disorders such as vertigo. It is also used recreationally in many countries including the United States, United Kingdom and Australia to reduce social anxiety and induce feelings of euphoria. 


Phenibut was first synthesised in Russia in the 1960s by Vsevolod Vasilievich Perekalin and his associates at the Department of Organic Chemistry of the Herzen Pedagogical Institute in St Petersburg, Russia. In initial publications, phenibut was known as phenigamma. The drug used to be included in medical kits for cosmonauts on Russian space flights due to the reports of enhanced cognition and high tranquilising properties.

Side Effects

Side effects of phenibut are linked to its central nervous system depressant effects, such as sedation and problems with breathing. There is currently limited information about phenibut. But because it has similar pharmacological properties to baclofen with side effects. These include gastrointestinal symptoms (nausea, vomiting, diarrhoea), central nervous system symptoms (insomnia, confusion, euphoria, depression, hallucinations), and visual disturbances and musculoskeletal symptoms.

Users of phenibut can also develop tolerance within days, needing more of the drug to feel the same effects. This can increase the risk of adverse effects. Users may develop withdrawal effects, such as severe rebound anxiety and insomnia, when they stop taking the drug.

Signs of overdose include:

Shallow, irregular breathing; Drowsiness and lethargy; Increased sweating; Decreasing blood pressure; Nausea and Vomiting; and Lowering Body Temperature. The reported adverse events of phenibut are just scratching the surface of a largely unregulated online drug market with no standards of quality assurance. So for those students seeking the competitive edge, it looks like those extra marks are not worth it after all.