Most people buy Xanax online to treat panic disorders with or without a fear of places and situations that might cause panic, helplessness, or embarrassment (agoraphobia). It comes as an oral tablet. It comes in four strengths i.e 0.25 milligrams (mg), 0.5 mg, 1 mg, 2 mg. Treatment for patients with anxiety should be initiated with a dose of 0.25 to 0.5 mg Xanax given three times daily. Treatment of many panic disorders in patients has required the use of Xanax at doses greater than 4 mg daily.