Phenibut

Phenibut (beta-phenyl-gamma-aminobutyric acid) was developed in Russia in the 1960's and is used for its anxiety-reducing effect as well as for its nootropic effect. Phenibut is structurally similar to the inhibitory neurotransmitter GABA, but it more effectively crosses the blood-brain barrier.
In Russia phenibut is used to treat post-traumic stress disorder, stuttering, and insomnia.