Xanax 0.25Mg is a prescription drug used to treat symptoms of anxiety, panic disorder, and anxiety associated with depression. Xanax 0.25mg can be used alone or with other medications. Xanax belongs to a class of drugs called anti-anxiety drugs, anxiolytics, and benzodiazepines. It is not known if Xanax is safe and effective in children under the age of 18.