Stress suppression - Phenibut has medium to solid anxiolytic effects, comparable to Alcoholic beverages but commonly a lot less impressive than benzodiazepines.GABA-B Receptor Agonist: The main system of action of phenibut is being an agonist within the GABA-B (gamma-aminobutyric acid variety B) receptors. GABA is the key inhibitory neurotransmitte