Xanax 0.25mg is the minimum dose of Xanax that can be used to treat panic disorders and anxiety. This does of Xanax helps to suppress life’s unexpected extreme fear and tension that is created on the mind due to stress. It is always recommended to start with a small dosage of Xanax or any other drug and then increase it gradually in order not to get affected by the sudden high dose of a medicine that you may not have used earlier.