The prescription drug Xanax XR 3 mg is used to treat freeze clutter and symptoms of anxiety associated with freeze clutters. The finest component of Xanax is usually alprazolam, an extended-release (XR) drug. The effects of XR tablets wear off over time and are not as strong in the human body.Xanax XR dosage recommendations range from 3 to 6 mg daily. Initial sedate dosage ranges from 0.5 to 1 mg once daily; morning is the best time to take this medication. If the patient responds well to the measurements, the dosage can be increased to 1 mg at the beginning of each day.