Xanax 1 mg tablet used to treat anxiety and panic disorder it is used to relieve symptoms of anxiety including anxiety caused depression it treats panic disorder in some patients. Xanax 1 mg tablet only adult used at first time 0.5 to 1 mg taken in the morning at least once per day. Xanax 1 mg tablet side effect confusion and severe drowsiness liver and lung problems. Xanax 1 mg tablet taken without a prescription from a medical doctor .