Benzodiazepines are a class of anti-anxiety medications, or anxiolytics, that increase the activity of the gamma-aminobutyric acid receptors in the brain. GABA is a neurotransmitter, a molecule that helps brain cells, or neurons, communicate with each other. GABA receptors are widely available across the brain, and benzodiazepines work to reduce anxiety by enhancing GABA inhibitory function. Xanax is the sold-out name of benzodiazepine in the market.