Phenytoin is a "nootropic drug" that has multiple effects on the body and nervous system. Nootropics are drugs that enhance memory or stimulate specific areas of the brain. It is also used to treat conditions such as anxiety and insomnia. People with generalized anxiety disorder (GAD) may benefit from taking phenibbuter. The technical name of the drug is β-phenyl-γ-aminobutyric acid, which is a derivative of γ-aminobutyric acid, a neuromodulator, and GABA (and its derivatives, such as phenytoin sodium) has been proven to have some Predictive effects make these chemicals useful for certain treatments. Phenibut is a nootropic, sometimes used to treat anxiety. This drug was originally a "astronaut's medicine."