Yellow Xanax Bars are benzodiazepines that depress the central nervous system (CNS). It belongs to the benzodiazepine class of drugs and raises GABA (Gamma-Aminobutyric Acid) levels. GABA is a naturally occurring chemical in the brain that has a calming effect on the brain. When you take Yellow Xanax Bars, it works within 20 to 30 minutes and binds to the GABA receptor. As a result, it increases the activity and function of neurotransmitters, calms the brain and nerve cells, reduces hyperactivity, and induces relaxation.