Xanax is in a group of drugs called benzodiazepines (ben-zoe-dye-AZE-eh-peens). Xanax affects chemicals in the brain that may become unbalanced and cause anxiety. Xanax is used to treat anxiety disorders, panic disorders, and anxiety caused by depression. Xanax may also be used for purposes other than those listed in this medication guide. Important information about Xanax Do not use this medication if you are allergic to Xanax or to other benzodiazepines, such as chlordiazepoxide (Librium), clorazepate (Tranxene), diazepam (Valium), lorazepam (Ativan), or oxazepam (Serax). This medication can cause birth defects in an unborn baby. Do not use Xanax if you are pregnant. Before taking Xanax, tell your doctor if you have any breathing problems, glaucoma, kidney or liver disease, or a history of depression, suicidal thoughts, or addiction to drugs or alcohol.