Xanax is a tranquilizer used in the short-term relief of symptoms of anxiety or the treatment of anxiety disorders. Anxiety disorder is marked by unrealistic worry or excessive fears and concerns. Anxiety associated with depression is also responsive to Xanax. Xanax and the extended-release formulation, Xanax XR, are also used in the treatment of panic disorder, which appears as unexpected panic attacks and may be accompanied by a fear of open or public places called agoraphobia. Only your doctor can diagnose panic disorder and best advise you about treatment. Some doctors prescribe Xanax to treat alcohol withdrawal, fear of open spaces and strangers, depression, irritable bowel syndrome, and premenstrual syndrome. Important Facts Tolerance and dependence can occur with the use of Xanax. You may experience withdrawal symptoms if you stop using the drug abruptly. The drug dosage should be gradually reduced and only your doctor should advise you on how to discontinue or change your dose Directions for Use Xanax may be taken with or without food. Take it exactly as prescribed. Do not chew, crush, or break the Xanax tablets. Missed Dose If you are less than 1 hour late, take it as soon as you remember. Otherwise skip the dose and go back to your regular schedule. Never take 2 doses at the same time.