Xanax is the brand name for the medicine Alprazolam, which belongs to the benzodiazepine class of drugs that act as a central nervous system (CNS) depressant. You can Buy Yellow Xanax Bar Online to treat anxiety and panic disorders. It works by inhibiting the activities of a neurotransmitter called GABA (gamma-aminobutyric acid) and making a person feel calm. Although the drug is prescribed to treat anxiety and panic disorders, it is recommended that the drug be taken only when the situation causing anxiety or panic becomes out of control.