Xanax is the brand name for alprazolam, a prescription medication belonging to the benzodiazepine class. It is commonly prescribed for certain anxiety and panic disorders. Xanax works by enhancing the effects of a chemical messenger called GABA in the brain, producing a calming effect. Because alprazolam can cause drowsiness, dizziness, impaired coordination, and memory problems, it should be taken only as prescribed by a qualified healthcare professional. Regular use can lead to physical dependence, and suddenly stopping treatment may cause withdrawal symptoms, which can sometimes be serious.