My mother has cancer. She has been given a small dose of Xanax three times/day. I see her anxiety level increase as the time approaches for her next dose. I have wondered why she isn t given Xanax ER instead of three doses/dy. The doctor just ignores the question. In the past a doctor put me on Xanax (before ER was available. I noticed that as time approached for my next dose, I felt as if I was climbing the walls. We stopped Xanax and went to Klonopin which didn t cause the same reaction. Mom is 87. Should Xanax ER be considered? She is experiencing the same type of reaction that I did. I am also a nurse. Thank You