White Xanax bar is a benzodiazepine group of medications that works by increasing the activity and functions of GABA. GABA is an amino acid responsible for producing calming and relaxing effects. GABA is a Gamma-Aminobutyric Acid known as an inhibitory neurotransmitter that binds at the neural transmission and prevents the passing of chemical messages into the brain cells. As a result, it reduces the hyperactivity of the brain cells and calms the brain ad nerve cells, an induce relaxation.