Xanax is a medicine that can be used to help relieve anxiety and panic attacks. Xanax is available in a pill or liquid form, or as an injection. Xanax helps control the symptoms of anxiety by blocking the effects of chemicals in the brain that cause anxiety, without causing drowsiness or other side effects is used to treat panic disorder, generalized anxiety disorder (GAD), post-traumatic stress disorder (PTSD), and obsessive-compulsive disorder (OCD). When taken as prescribed, it can reduce stress, help you fall asleep, and relieve symptoms of depression. It works by slowing down the chemicals in your brain that cause fear, stress, or depression. Xanax is one of the best medicines available. It works by preventing your body from overreacting to stress or anxiety by altering the way it handles it all. The drug works by increasing the action of a naturally occurring substance in the brain called GABA. The usual adult dose of Xanax is 25mg taken once daily.