Phenibut is chemically known as β-phenyl-gamma-aminobutyric acid. It is available as a nutritional supplement, over-the-counter drug or sometimes as prescribed medication in many countries and sold under the brand names Anvifen, Fenibut, and Noofen and others.
Phenibut is intended to relieve anxiety. It is known for its ability to reduce stress, anxiety and improve sleep without causing drowsiness. In Russia, where the drug was originally invented and produced, it is used as prescribed medication for treatment of large variety of psychological conditions including treatment of asthenia, depression, alcoholism, alcohol withdrawal syndrome, post-traumatic stress disorder, stuttering, tics, vestibular disorders, Meniere’s disease, dizziness, for the prevention of motion sickness, and for the prevention of anxiety before or after surgical procedures or painful diagnostic tests.
Some reports suggests that Phenibut may have revitalizing and rejuvenating effects on the body, possibly by increasing growth hormone levels, and it seems to improve skin and muscle tone, as well as general health and overall well-being as a result of reduced stress and improved sleeping pattern.
Although in USA Phenibut is not approved by FDA to treat any medical condition it is sold and marketed as supplement.