Learn about Xanax XR (Alprazolam) may treat, uses, dosage, side effects, drug interactions, Generic Name: alprazolam; Brand Name: Xanax XR tablet, for oral administration, contains 0.5 mg, 1 mg, 2 mg, or 3 mg of alprazolam. .. XR Tablets, the dosage should be reduced slowly in keeping with good...