I was on Xanax XR - 2 mg./day for 12 years. It worked great with no real side effects. Suddenly, it stopped working and I felt like I wasn't taking any medication at all. I also started having night sweats and panic attacks - mostly at night. I get hot at the back of my neck and my arms feel heavy and hot. Now I take 3 mg/day of the Xanax XR and 40mg. Viibryd - an anti-depressant. I am NOT depressed and most doctors don't hear that. I AM ANXIOUS! However, I may be getting depressed because the anti-depressant (I believe) is making me gain weight. Is anyone aware of any other anti-anxiety meds that are "extended release - XR"?