Xanax is a Prescribed medicine. It is used to treat anxiety and panic disorder. It is known as alprazolam benzodiazepine is belongs to a class of drugs. works by lessening abnormal excitement in the brain. Do not take more time. may cause serious side effects including depressed mood, confusion, and agitation. Xanax is available in 1mg,2mg,3mg, and 0.5mg.